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linux-zen-server/drivers/virt/vboxguest/vboxguest_core.c

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Initial commit
2023-08-30 17:53:23 +02:00
/* SPDX-License-Identifier: (GPL-2.0 OR CDDL-1.0) */
/*
* vboxguest core guest-device handling code, VBoxGuest.cpp in upstream svn.
*
* Copyright (C) 2007-2016 Oracle Corporation
*/
#include <linux/device.h>
#include <linux/io.h>
#include <linux/mm.h>
#include <linux/sched.h>
#include <linux/sizes.h>
#include <linux/slab.h>
#include <linux/vbox_err.h>
#include <linux/vbox_utils.h>
#include <linux/vmalloc.h>
#include "vboxguest_core.h"
#include "vboxguest_version.h"
/* Get the pointer to the first HGCM parameter. */
#define VBG_IOCTL_HGCM_CALL_PARMS(a) \
((struct vmmdev_hgcm_function_parameter *)( \
(u8 *)(a) + sizeof(struct vbg_ioctl_hgcm_call)))
/* Get the pointer to the first HGCM parameter in a 32-bit request. */
#define VBG_IOCTL_HGCM_CALL_PARMS32(a) \
((struct vmmdev_hgcm_function_parameter32 *)( \
(u8 *)(a) + sizeof(struct vbg_ioctl_hgcm_call)))
#define GUEST_MAPPINGS_TRIES 5
#define VBG_KERNEL_REQUEST \
(VMMDEV_REQUESTOR_KERNEL | VMMDEV_REQUESTOR_USR_DRV | \
VMMDEV_REQUESTOR_CON_DONT_KNOW | VMMDEV_REQUESTOR_TRUST_NOT_GIVEN)
/**
* Reserves memory in which the VMM can relocate any guest mappings
* that are floating around.
*
* This operation is a little bit tricky since the VMM might not accept
* just any address because of address clashes between the three contexts
* it operates in, so we try several times.
*
* Failure to reserve the guest mappings is ignored.
*
* @gdev: The Guest extension device.
*/
static void vbg_guest_mappings_init(struct vbg_dev *gdev)
{
struct vmmdev_hypervisorinfo *req;
void *guest_mappings[GUEST_MAPPINGS_TRIES];
struct page **pages = NULL;
u32 size, hypervisor_size;
int i, rc;
/* Query the required space. */
req = vbg_req_alloc(sizeof(*req), VMMDEVREQ_GET_HYPERVISOR_INFO,
VBG_KERNEL_REQUEST);
if (!req)
return;
req->hypervisor_start = 0;
req->hypervisor_size = 0;
rc = vbg_req_perform(gdev, req);
if (rc < 0)
goto out;
/*
* The VMM will report back if there is nothing it wants to map, like
* for instance in VT-x and AMD-V mode.
*/
if (req->hypervisor_size == 0)
goto out;
hypervisor_size = req->hypervisor_size;
/* Add 4M so that we can align the vmap to 4MiB as the host requires. */
size = PAGE_ALIGN(req->hypervisor_size) + SZ_4M;
pages = kmalloc_array(size >> PAGE_SHIFT, sizeof(*pages), GFP_KERNEL);
if (!pages)
goto out;
gdev->guest_mappings_dummy_page = alloc_page(GFP_HIGHUSER);
if (!gdev->guest_mappings_dummy_page)
goto out;
for (i = 0; i < (size >> PAGE_SHIFT); i++)
pages[i] = gdev->guest_mappings_dummy_page;
/*
* Try several times, the VMM might not accept some addresses because
* of address clashes between the three contexts.
*/
for (i = 0; i < GUEST_MAPPINGS_TRIES; i++) {
guest_mappings[i] = vmap(pages, (size >> PAGE_SHIFT),
VM_MAP, PAGE_KERNEL_RO);
if (!guest_mappings[i])
break;
req->header.request_type = VMMDEVREQ_SET_HYPERVISOR_INFO;
req->header.rc = VERR_INTERNAL_ERROR;
req->hypervisor_size = hypervisor_size;
req->hypervisor_start =
(unsigned long)PTR_ALIGN(guest_mappings[i], SZ_4M);
rc = vbg_req_perform(gdev, req);
if (rc >= 0) {
gdev->guest_mappings = guest_mappings[i];
break;
}
}
/* Free vmap's from failed attempts. */
while (--i >= 0)
vunmap(guest_mappings[i]);
/* On failure free the dummy-page backing the vmap */
if (!gdev->guest_mappings) {
__free_page(gdev->guest_mappings_dummy_page);
gdev->guest_mappings_dummy_page = NULL;
}
out:
vbg_req_free(req, sizeof(*req));
kfree(pages);
}
/**
* Undo what vbg_guest_mappings_init did.
*
* @gdev: The Guest extension device.
*/
static void vbg_guest_mappings_exit(struct vbg_dev *gdev)
{
struct vmmdev_hypervisorinfo *req;
int rc;
if (!gdev->guest_mappings)
return;
/*
* Tell the host that we're going to free the memory we reserved for
* it, the free it up. (Leak the memory if anything goes wrong here.)
*/
req = vbg_req_alloc(sizeof(*req), VMMDEVREQ_SET_HYPERVISOR_INFO,
VBG_KERNEL_REQUEST);
if (!req)
return;
req->hypervisor_start = 0;
req->hypervisor_size = 0;
rc = vbg_req_perform(gdev, req);
vbg_req_free(req, sizeof(*req));
if (rc < 0) {
vbg_err("%s error: %d\n", __func__, rc);
return;
}
vunmap(gdev->guest_mappings);
gdev->guest_mappings = NULL;
__free_page(gdev->guest_mappings_dummy_page);
gdev->guest_mappings_dummy_page = NULL;
}
/**
* Report the guest information to the host.
* Return: 0 or negative errno value.
* @gdev: The Guest extension device.
*/
static int vbg_report_guest_info(struct vbg_dev *gdev)
{
/*
* Allocate and fill in the two guest info reports.
*/
struct vmmdev_guest_info *req1 = NULL;
struct vmmdev_guest_info2 *req2 = NULL;
int rc, ret = -ENOMEM;
req1 = vbg_req_alloc(sizeof(*req1), VMMDEVREQ_REPORT_GUEST_INFO,
VBG_KERNEL_REQUEST);
req2 = vbg_req_alloc(sizeof(*req2), VMMDEVREQ_REPORT_GUEST_INFO2,
VBG_KERNEL_REQUEST);
if (!req1 || !req2)
goto out_free;
req1->interface_version = VMMDEV_VERSION;
req1->os_type = VMMDEV_OSTYPE_LINUX26;
#if __BITS_PER_LONG == 64
req1->os_type |= VMMDEV_OSTYPE_X64;
#endif
req2->additions_major = VBG_VERSION_MAJOR;
req2->additions_minor = VBG_VERSION_MINOR;
req2->additions_build = VBG_VERSION_BUILD;
req2->additions_revision = VBG_SVN_REV;
req2->additions_features =
VMMDEV_GUEST_INFO2_ADDITIONS_FEATURES_REQUESTOR_INFO;
strscpy(req2->name, VBG_VERSION_STRING,
sizeof(req2->name));
/*
* There are two protocols here:
* 1. INFO2 + INFO1. Supported by >=3.2.51.
* 2. INFO1 and optionally INFO2. The old protocol.
*
* We try protocol 2 first. It will fail with VERR_NOT_SUPPORTED
* if not supported by the VMMDev (message ordering requirement).
*/
rc = vbg_req_perform(gdev, req2);
if (rc >= 0) {
rc = vbg_req_perform(gdev, req1);
} else if (rc == VERR_NOT_SUPPORTED || rc == VERR_NOT_IMPLEMENTED) {
rc = vbg_req_perform(gdev, req1);
if (rc >= 0) {
rc = vbg_req_perform(gdev, req2);
if (rc == VERR_NOT_IMPLEMENTED)
rc = VINF_SUCCESS;
}
}
ret = vbg_status_code_to_errno(rc);
out_free:
vbg_req_free(req2, sizeof(*req2));
vbg_req_free(req1, sizeof(*req1));
return ret;
}
/**
* Report the guest driver status to the host.
* Return: 0 or negative errno value.
* @gdev: The Guest extension device.
* @active: Flag whether the driver is now active or not.
*/
static int vbg_report_driver_status(struct vbg_dev *gdev, bool active)
{
struct vmmdev_guest_status *req;
int rc;
req = vbg_req_alloc(sizeof(*req), VMMDEVREQ_REPORT_GUEST_STATUS,
VBG_KERNEL_REQUEST);
if (!req)
return -ENOMEM;
req->facility = VBOXGUEST_FACILITY_TYPE_VBOXGUEST_DRIVER;
if (active)
req->status = VBOXGUEST_FACILITY_STATUS_ACTIVE;
else
req->status = VBOXGUEST_FACILITY_STATUS_INACTIVE;
req->flags = 0;
rc = vbg_req_perform(gdev, req);
if (rc == VERR_NOT_IMPLEMENTED) /* Compatibility with older hosts. */
rc = VINF_SUCCESS;
vbg_req_free(req, sizeof(*req));
return vbg_status_code_to_errno(rc);
}
/**
* Inflate the balloon by one chunk. The caller owns the balloon mutex.
* Return: 0 or negative errno value.
* @gdev: The Guest extension device.
* @chunk_idx: Index of the chunk.
*/
static int vbg_balloon_inflate(struct vbg_dev *gdev, u32 chunk_idx)
{
struct vmmdev_memballoon_change *req = gdev->mem_balloon.change_req;
struct page **pages;
int i, rc, ret;
pages = kmalloc_array(VMMDEV_MEMORY_BALLOON_CHUNK_PAGES,
sizeof(*pages),
GFP_KERNEL | __GFP_NOWARN);
if (!pages)
return -ENOMEM;
req->header.size = sizeof(*req);
req->inflate = true;
req->pages = VMMDEV_MEMORY_BALLOON_CHUNK_PAGES;
for (i = 0; i < VMMDEV_MEMORY_BALLOON_CHUNK_PAGES; i++) {
pages[i] = alloc_page(GFP_KERNEL | __GFP_NOWARN);
if (!pages[i]) {
ret = -ENOMEM;
goto out_error;
}
req->phys_page[i] = page_to_phys(pages[i]);
}
rc = vbg_req_perform(gdev, req);
if (rc < 0) {
vbg_err("%s error, rc: %d\n", __func__, rc);
ret = vbg_status_code_to_errno(rc);
goto out_error;
}
gdev->mem_balloon.pages[chunk_idx] = pages;
return 0;
out_error:
while (--i >= 0)
__free_page(pages[i]);
kfree(pages);
return ret;
}
/**
* Deflate the balloon by one chunk. The caller owns the balloon mutex.
* Return: 0 or negative errno value.
* @gdev: The Guest extension device.
* @chunk_idx: Index of the chunk.
*/
static int vbg_balloon_deflate(struct vbg_dev *gdev, u32 chunk_idx)
{
struct vmmdev_memballoon_change *req = gdev->mem_balloon.change_req;
struct page **pages = gdev->mem_balloon.pages[chunk_idx];
int i, rc;
req->header.size = sizeof(*req);
req->inflate = false;
req->pages = VMMDEV_MEMORY_BALLOON_CHUNK_PAGES;
for (i = 0; i < VMMDEV_MEMORY_BALLOON_CHUNK_PAGES; i++)
req->phys_page[i] = page_to_phys(pages[i]);
rc = vbg_req_perform(gdev, req);
if (rc < 0) {
vbg_err("%s error, rc: %d\n", __func__, rc);
return vbg_status_code_to_errno(rc);
}
for (i = 0; i < VMMDEV_MEMORY_BALLOON_CHUNK_PAGES; i++)
__free_page(pages[i]);
kfree(pages);
gdev->mem_balloon.pages[chunk_idx] = NULL;
return 0;
}
/**
* Respond to VMMDEV_EVENT_BALLOON_CHANGE_REQUEST events, query the size
* the host wants the balloon to be and adjust accordingly.
*/
static void vbg_balloon_work(struct work_struct *work)
{
struct vbg_dev *gdev =
container_of(work, struct vbg_dev, mem_balloon.work);
struct vmmdev_memballoon_info *req = gdev->mem_balloon.get_req;
u32 i, chunks;
int rc, ret;
/*
* Setting this bit means that we request the value from the host and
* change the guest memory balloon according to the returned value.
*/
req->event_ack = VMMDEV_EVENT_BALLOON_CHANGE_REQUEST;
rc = vbg_req_perform(gdev, req);
if (rc < 0) {
vbg_err("%s error, rc: %d)\n", __func__, rc);
return;
}
/*
* The host always returns the same maximum amount of chunks, so
* we do this once.
*/
if (!gdev->mem_balloon.max_chunks) {
gdev->mem_balloon.pages =
devm_kcalloc(gdev->dev, req->phys_mem_chunks,
sizeof(struct page **), GFP_KERNEL);
if (!gdev->mem_balloon.pages)
return;
gdev->mem_balloon.max_chunks = req->phys_mem_chunks;
}
chunks = req->balloon_chunks;
if (chunks > gdev->mem_balloon.max_chunks) {
vbg_err("%s: illegal balloon size %u (max=%u)\n",
__func__, chunks, gdev->mem_balloon.max_chunks);
return;
}
if (chunks > gdev->mem_balloon.chunks) {
/* inflate */
for (i = gdev->mem_balloon.chunks; i < chunks; i++) {
ret = vbg_balloon_inflate(gdev, i);
if (ret < 0)
return;
gdev->mem_balloon.chunks++;
}
} else {
/* deflate */
for (i = gdev->mem_balloon.chunks; i-- > chunks;) {
ret = vbg_balloon_deflate(gdev, i);
if (ret < 0)
return;
gdev->mem_balloon.chunks--;
}
}
}
/**
* Callback for heartbeat timer.
*/
static void vbg_heartbeat_timer(struct timer_list *t)
{
struct vbg_dev *gdev = from_timer(gdev, t, heartbeat_timer);
vbg_req_perform(gdev, gdev->guest_heartbeat_req);
mod_timer(&gdev->heartbeat_timer,
msecs_to_jiffies(gdev->heartbeat_interval_ms));
}
/**
* Configure the host to check guest's heartbeat
* and get heartbeat interval from the host.
* Return: 0 or negative errno value.
* @gdev: The Guest extension device.
* @enabled: Set true to enable guest heartbeat checks on host.
*/
static int vbg_heartbeat_host_config(struct vbg_dev *gdev, bool enabled)
{
struct vmmdev_heartbeat *req;
int rc;
req = vbg_req_alloc(sizeof(*req), VMMDEVREQ_HEARTBEAT_CONFIGURE,
VBG_KERNEL_REQUEST);
if (!req)
return -ENOMEM;
req->enabled = enabled;
req->interval_ns = 0;
rc = vbg_req_perform(gdev, req);
do_div(req->interval_ns, 1000000); /* ns -> ms */
gdev->heartbeat_interval_ms = req->interval_ns;
vbg_req_free(req, sizeof(*req));
return vbg_status_code_to_errno(rc);
}
/**
* Initializes the heartbeat timer. This feature may be disabled by the host.
* Return: 0 or negative errno value.
* @gdev: The Guest extension device.
*/
static int vbg_heartbeat_init(struct vbg_dev *gdev)
{
int ret;
/* Make sure that heartbeat checking is disabled if we fail. */
ret = vbg_heartbeat_host_config(gdev, false);
if (ret < 0)
return ret;
ret = vbg_heartbeat_host_config(gdev, true);
if (ret < 0)
return ret;
gdev->guest_heartbeat_req = vbg_req_alloc(
sizeof(*gdev->guest_heartbeat_req),
VMMDEVREQ_GUEST_HEARTBEAT,
VBG_KERNEL_REQUEST);
if (!gdev->guest_heartbeat_req)
return -ENOMEM;
vbg_info("%s: Setting up heartbeat to trigger every %d milliseconds\n",
__func__, gdev->heartbeat_interval_ms);
mod_timer(&gdev->heartbeat_timer, 0);
return 0;
}
/**
* Cleanup hearbeat code, stop HB timer and disable host heartbeat checking.
* @gdev: The Guest extension device.
*/
static void vbg_heartbeat_exit(struct vbg_dev *gdev)
{
del_timer_sync(&gdev->heartbeat_timer);
vbg_heartbeat_host_config(gdev, false);
vbg_req_free(gdev->guest_heartbeat_req,
sizeof(*gdev->guest_heartbeat_req));
}
/**
* Applies a change to the bit usage tracker.
* Return: true if the mask changed, false if not.
* @tracker: The bit usage tracker.
* @changed: The bits to change.
* @previous: The previous value of the bits.
*/
static bool vbg_track_bit_usage(struct vbg_bit_usage_tracker *tracker,
u32 changed, u32 previous)
{
bool global_change = false;
while (changed) {
u32 bit = ffs(changed) - 1;
u32 bitmask = BIT(bit);
if (bitmask & previous) {
tracker->per_bit_usage[bit] -= 1;
if (tracker->per_bit_usage[bit] == 0) {
global_change = true;
tracker->mask &= ~bitmask;
}
} else {
tracker->per_bit_usage[bit] += 1;
if (tracker->per_bit_usage[bit] == 1) {
global_change = true;
tracker->mask |= bitmask;
}
}
changed &= ~bitmask;
}
return global_change;
}
/**
* Init and termination worker for resetting the (host) event filter on the host
* Return: 0 or negative errno value.
* @gdev: The Guest extension device.
* @fixed_events: Fixed events (init time).
*/
static int vbg_reset_host_event_filter(struct vbg_dev *gdev,
u32 fixed_events)
{
struct vmmdev_mask *req;
int rc;
req = vbg_req_alloc(sizeof(*req), VMMDEVREQ_CTL_GUEST_FILTER_MASK,
VBG_KERNEL_REQUEST);
if (!req)
return -ENOMEM;
req->not_mask = U32_MAX & ~fixed_events;
req->or_mask = fixed_events;
rc = vbg_req_perform(gdev, req);
if (rc < 0)
vbg_err("%s error, rc: %d\n", __func__, rc);
vbg_req_free(req, sizeof(*req));
return vbg_status_code_to_errno(rc);
}
/**
* Changes the event filter mask for the given session.
*
* This is called in response to VBG_IOCTL_CHANGE_FILTER_MASK as well as to
* do session cleanup. Takes the session mutex.
*
* Return: 0 or negative errno value.
* @gdev: The Guest extension device.
* @session: The session.
* @or_mask: The events to add.
* @not_mask: The events to remove.
* @session_termination: Set if we're called by the session cleanup code.
* This tweaks the error handling so we perform
* proper session cleanup even if the host
* misbehaves.
*/
static int vbg_set_session_event_filter(struct vbg_dev *gdev,
struct vbg_session *session,
u32 or_mask, u32 not_mask,
bool session_termination)
{
struct vmmdev_mask *req;
u32 changed, previous;
int rc, ret = 0;
/*
* Allocate a request buffer before taking the spinlock, when
* the session is being terminated the requestor is the kernel,
* as we're cleaning up.
*/
req = vbg_req_alloc(sizeof(*req), VMMDEVREQ_CTL_GUEST_FILTER_MASK,
session_termination ? VBG_KERNEL_REQUEST :
session->requestor);
if (!req) {
if (!session_termination)
return -ENOMEM;
/* Ignore allocation failure, we must do session cleanup. */
}
mutex_lock(&gdev->session_mutex);
/* Apply the changes to the session mask. */
previous = session->event_filter;
session->event_filter |= or_mask;
session->event_filter &= ~not_mask;
/* If anything actually changed, update the global usage counters. */
changed = previous ^ session->event_filter;
if (!changed)
goto out;
vbg_track_bit_usage(&gdev->event_filter_tracker, changed, previous);
or_mask = gdev->fixed_events | gdev->event_filter_tracker.mask;
if (gdev->event_filter_host == or_mask || !req)
goto out;
gdev->event_filter_host = or_mask;
req->or_mask = or_mask;
req->not_mask = ~or_mask;
rc = vbg_req_perform(gdev, req);
if (rc < 0) {
ret = vbg_status_code_to_errno(rc);
/* Failed, roll back (unless it's session termination time). */
gdev->event_filter_host = U32_MAX;
if (session_termination)
goto out;
vbg_track_bit_usage(&gdev->event_filter_tracker, changed,
session->event_filter);
session->event_filter = previous;
}
out:
mutex_unlock(&gdev->session_mutex);
vbg_req_free(req, sizeof(*req));
return ret;
}
/**
* Init and termination worker for set guest capabilities to zero on the host.
* Return: 0 or negative errno value.
* @gdev: The Guest extension device.
*/
static int vbg_reset_host_capabilities(struct vbg_dev *gdev)
{
struct vmmdev_mask *req;
int rc;
req = vbg_req_alloc(sizeof(*req), VMMDEVREQ_SET_GUEST_CAPABILITIES,
VBG_KERNEL_REQUEST);
if (!req)
return -ENOMEM;
req->not_mask = U32_MAX;
req->or_mask = 0;
rc = vbg_req_perform(gdev, req);
if (rc < 0)
vbg_err("%s error, rc: %d\n", __func__, rc);
vbg_req_free(req, sizeof(*req));
return vbg_status_code_to_errno(rc);
}
/**
* Set guest capabilities on the host.
* Must be called with gdev->session_mutex hold.
* Return: 0 or negative errno value.
* @gdev: The Guest extension device.
* @session: The session.
* @session_termination: Set if we're called by the session cleanup code.
*/
static int vbg_set_host_capabilities(struct vbg_dev *gdev,
struct vbg_session *session,
bool session_termination)
{
struct vmmdev_mask *req;
u32 caps;
int rc;
WARN_ON(!mutex_is_locked(&gdev->session_mutex));
caps = gdev->acquired_guest_caps | gdev->set_guest_caps_tracker.mask;
if (gdev->guest_caps_host == caps)
return 0;
/* On termination the requestor is the kernel, as we're cleaning up. */
req = vbg_req_alloc(sizeof(*req), VMMDEVREQ_SET_GUEST_CAPABILITIES,
session_termination ? VBG_KERNEL_REQUEST :
session->requestor);
if (!req) {
gdev->guest_caps_host = U32_MAX;
return -ENOMEM;
}
req->or_mask = caps;
req->not_mask = ~caps;
rc = vbg_req_perform(gdev, req);
vbg_req_free(req, sizeof(*req));
gdev->guest_caps_host = (rc >= 0) ? caps : U32_MAX;
return vbg_status_code_to_errno(rc);
}
/**
* Acquire (get exclusive access) guest capabilities for a session.
* Takes the session mutex.
* Return: 0 or negative errno value.
* @gdev: The Guest extension device.
* @session: The session.
* @flags: Flags (VBGL_IOC_AGC_FLAGS_XXX).
* @or_mask: The capabilities to add.
* @not_mask: The capabilities to remove.
* @session_termination: Set if we're called by the session cleanup code.
* This tweaks the error handling so we perform
* proper session cleanup even if the host
* misbehaves.
*/
static int vbg_acquire_session_capabilities(struct vbg_dev *gdev,
struct vbg_session *session,
u32 or_mask, u32 not_mask,
u32 flags, bool session_termination)
{
unsigned long irqflags;
bool wakeup = false;
int ret = 0;
mutex_lock(&gdev->session_mutex);
if (gdev->set_guest_caps_tracker.mask & or_mask) {
vbg_err("%s error: cannot acquire caps which are currently set\n",
__func__);
ret = -EINVAL;
goto out;
}
/*
* Mark any caps in the or_mask as now being in acquire-mode. Note
* once caps are in acquire_mode they always stay in this mode.
* This impacts event handling, so we take the event-lock.
*/
spin_lock_irqsave(&gdev->event_spinlock, irqflags);
gdev->acquire_mode_guest_caps |= or_mask;
spin_unlock_irqrestore(&gdev->event_spinlock, irqflags);
/* If we only have to switch the caps to acquire mode, we're done. */
if (flags & VBGL_IOC_AGC_FLAGS_CONFIG_ACQUIRE_MODE)
goto out;
not_mask &= ~or_mask; /* or_mask takes priority over not_mask */
not_mask &= session->acquired_guest_caps;
or_mask &= ~session->acquired_guest_caps;
if (or_mask == 0 && not_mask == 0)
goto out;
if (gdev->acquired_guest_caps & or_mask) {
ret = -EBUSY;
goto out;
}
gdev->acquired_guest_caps |= or_mask;
gdev->acquired_guest_caps &= ~not_mask;
/* session->acquired_guest_caps impacts event handling, take the lock */
spin_lock_irqsave(&gdev->event_spinlock, irqflags);
session->acquired_guest_caps |= or_mask;
session->acquired_guest_caps &= ~not_mask;
spin_unlock_irqrestore(&gdev->event_spinlock, irqflags);
ret = vbg_set_host_capabilities(gdev, session, session_termination);
/* Roll back on failure, unless it's session termination time. */
if (ret < 0 && !session_termination) {
gdev->acquired_guest_caps &= ~or_mask;
gdev->acquired_guest_caps |= not_mask;
spin_lock_irqsave(&gdev->event_spinlock, irqflags);
session->acquired_guest_caps &= ~or_mask;
session->acquired_guest_caps |= not_mask;
spin_unlock_irqrestore(&gdev->event_spinlock, irqflags);
}
/*
* If we added a capability, check if that means some other thread in
* our session should be unblocked because there are events pending
* (the result of vbg_get_allowed_event_mask_for_session() may change).
*
* HACK ALERT! When the seamless support capability is added we generate
* a seamless change event so that the ring-3 client can sync with
* the seamless state.
*/
if (ret == 0 && or_mask != 0) {
spin_lock_irqsave(&gdev->event_spinlock, irqflags);
if (or_mask & VMMDEV_GUEST_SUPPORTS_SEAMLESS)
gdev->pending_events |=
VMMDEV_EVENT_SEAMLESS_MODE_CHANGE_REQUEST;
if (gdev->pending_events)
wakeup = true;
spin_unlock_irqrestore(&gdev->event_spinlock, irqflags);
if (wakeup)
wake_up(&gdev->event_wq);
}
out:
mutex_unlock(&gdev->session_mutex);
return ret;
}
/**
* Sets the guest capabilities for a session. Takes the session mutex.
* Return: 0 or negative errno value.
* @gdev: The Guest extension device.
* @session: The session.
* @or_mask: The capabilities to add.
* @not_mask: The capabilities to remove.
* @session_termination: Set if we're called by the session cleanup code.
* This tweaks the error handling so we perform
* proper session cleanup even if the host
* misbehaves.
*/
static int vbg_set_session_capabilities(struct vbg_dev *gdev,
struct vbg_session *session,
u32 or_mask, u32 not_mask,
bool session_termination)
{
u32 changed, previous;
int ret = 0;
mutex_lock(&gdev->session_mutex);
if (gdev->acquire_mode_guest_caps & or_mask) {
vbg_err("%s error: cannot set caps which are in acquire_mode\n",
__func__);
ret = -EBUSY;
goto out;
}
/* Apply the changes to the session mask. */
previous = session->set_guest_caps;
session->set_guest_caps |= or_mask;
session->set_guest_caps &= ~not_mask;
/* If anything actually changed, update the global usage counters. */
changed = previous ^ session->set_guest_caps;
if (!changed)
goto out;
vbg_track_bit_usage(&gdev->set_guest_caps_tracker, changed, previous);
ret = vbg_set_host_capabilities(gdev, session, session_termination);
/* Roll back on failure, unless it's session termination time. */
if (ret < 0 && !session_termination) {
vbg_track_bit_usage(&gdev->set_guest_caps_tracker, changed,
session->set_guest_caps);
session->set_guest_caps = previous;
}
out:
mutex_unlock(&gdev->session_mutex);
return ret;
}
/**
* vbg_query_host_version get the host feature mask and version information.
* Return: 0 or negative errno value.
* @gdev: The Guest extension device.
*/
static int vbg_query_host_version(struct vbg_dev *gdev)
{
struct vmmdev_host_version *req;
int rc, ret;
req = vbg_req_alloc(sizeof(*req), VMMDEVREQ_GET_HOST_VERSION,
VBG_KERNEL_REQUEST);
if (!req)
return -ENOMEM;
rc = vbg_req_perform(gdev, req);
ret = vbg_status_code_to_errno(rc);
if (ret) {
vbg_err("%s error: %d\n", __func__, rc);
goto out;
}
snprintf(gdev->host_version, sizeof(gdev->host_version), "%u.%u.%ur%u",
req->major, req->minor, req->build, req->revision);
gdev->host_features = req->features;
vbg_info("vboxguest: host-version: %s %#x\n", gdev->host_version,
gdev->host_features);
if (!(req->features & VMMDEV_HVF_HGCM_PHYS_PAGE_LIST)) {
vbg_err("vboxguest: Error host too old (does not support page-lists)\n");
ret = -ENODEV;
}
out:
vbg_req_free(req, sizeof(*req));
return ret;
}
/**
* Initializes the VBoxGuest device extension when the
* device driver is loaded.
*
* The native code locates the VMMDev on the PCI bus and retrieve
* the MMIO and I/O port ranges, this function will take care of
* mapping the MMIO memory (if present). Upon successful return
* the native code should set up the interrupt handler.
*
* Return: 0 or negative errno value.
*
* @gdev: The Guest extension device.
* @fixed_events: Events that will be enabled upon init and no client
* will ever be allowed to mask.
*/
int vbg_core_init(struct vbg_dev *gdev, u32 fixed_events)
{
int ret = -ENOMEM;
gdev->fixed_events = fixed_events | VMMDEV_EVENT_HGCM;
gdev->event_filter_host = U32_MAX; /* forces a report */
gdev->guest_caps_host = U32_MAX; /* forces a report */
init_waitqueue_head(&gdev->event_wq);
init_waitqueue_head(&gdev->hgcm_wq);
spin_lock_init(&gdev->event_spinlock);
mutex_init(&gdev->session_mutex);
mutex_init(&gdev->cancel_req_mutex);
timer_setup(&gdev->heartbeat_timer, vbg_heartbeat_timer, 0);
INIT_WORK(&gdev->mem_balloon.work, vbg_balloon_work);
gdev->mem_balloon.get_req =
vbg_req_alloc(sizeof(*gdev->mem_balloon.get_req),
VMMDEVREQ_GET_MEMBALLOON_CHANGE_REQ,
VBG_KERNEL_REQUEST);
gdev->mem_balloon.change_req =
vbg_req_alloc(sizeof(*gdev->mem_balloon.change_req),
VMMDEVREQ_CHANGE_MEMBALLOON,
VBG_KERNEL_REQUEST);
gdev->cancel_req =
vbg_req_alloc(sizeof(*(gdev->cancel_req)),
VMMDEVREQ_HGCM_CANCEL2,
VBG_KERNEL_REQUEST);
gdev->ack_events_req =
vbg_req_alloc(sizeof(*gdev->ack_events_req),
VMMDEVREQ_ACKNOWLEDGE_EVENTS,
VBG_KERNEL_REQUEST);
gdev->mouse_status_req =
vbg_req_alloc(sizeof(*gdev->mouse_status_req),
VMMDEVREQ_GET_MOUSE_STATUS,
VBG_KERNEL_REQUEST);
if (!gdev->mem_balloon.get_req || !gdev->mem_balloon.change_req ||
!gdev->cancel_req || !gdev->ack_events_req ||
!gdev->mouse_status_req)
goto err_free_reqs;
ret = vbg_query_host_version(gdev);
if (ret)
goto err_free_reqs;
ret = vbg_report_guest_info(gdev);
if (ret) {
vbg_err("vboxguest: vbg_report_guest_info error: %d\n", ret);
goto err_free_reqs;
}
ret = vbg_reset_host_event_filter(gdev, gdev->fixed_events);
if (ret) {
vbg_err("vboxguest: Error setting fixed event filter: %d\n",
ret);
goto err_free_reqs;
}
ret = vbg_reset_host_capabilities(gdev);
if (ret) {
vbg_err("vboxguest: Error clearing guest capabilities: %d\n",
ret);
goto err_free_reqs;
}
ret = vbg_core_set_mouse_status(gdev, 0);
if (ret) {
vbg_err("vboxguest: Error clearing mouse status: %d\n", ret);
goto err_free_reqs;
}
/* These may fail without requiring the driver init to fail. */
vbg_guest_mappings_init(gdev);
vbg_heartbeat_init(gdev);
/* All Done! */
ret = vbg_report_driver_status(gdev, true);
if (ret < 0)
vbg_err("vboxguest: Error reporting driver status: %d\n", ret);
return 0;
err_free_reqs:
vbg_req_free(gdev->mouse_status_req,
sizeof(*gdev->mouse_status_req));
vbg_req_free(gdev->ack_events_req,
sizeof(*gdev->ack_events_req));
vbg_req_free(gdev->cancel_req,
sizeof(*gdev->cancel_req));
vbg_req_free(gdev->mem_balloon.change_req,
sizeof(*gdev->mem_balloon.change_req));
vbg_req_free(gdev->mem_balloon.get_req,
sizeof(*gdev->mem_balloon.get_req));
return ret;
}
/**
* Call this on exit to clean-up vboxguest-core managed resources.
*
* The native code should call this before the driver is loaded,
* but don't call this on shutdown.
* @gdev: The Guest extension device.
*/
void vbg_core_exit(struct vbg_dev *gdev)
{
vbg_heartbeat_exit(gdev);
vbg_guest_mappings_exit(gdev);
/* Clear the host flags (mouse status etc). */
vbg_reset_host_event_filter(gdev, 0);
vbg_reset_host_capabilities(gdev);
vbg_core_set_mouse_status(gdev, 0);
vbg_req_free(gdev->mouse_status_req,
sizeof(*gdev->mouse_status_req));
vbg_req_free(gdev->ack_events_req,
sizeof(*gdev->ack_events_req));
vbg_req_free(gdev->cancel_req,
sizeof(*gdev->cancel_req));
vbg_req_free(gdev->mem_balloon.change_req,
sizeof(*gdev->mem_balloon.change_req));
vbg_req_free(gdev->mem_balloon.get_req,
sizeof(*gdev->mem_balloon.get_req));
}
/**
* Creates a VBoxGuest user session.
*
* vboxguest_linux.c calls this when userspace opens the char-device.
* Return: A pointer to the new session or an ERR_PTR on error.
* @gdev: The Guest extension device.
* @requestor: VMMDEV_REQUESTOR_* flags
*/
struct vbg_session *vbg_core_open_session(struct vbg_dev *gdev, u32 requestor)
{
struct vbg_session *session;
session = kzalloc(sizeof(*session), GFP_KERNEL);
if (!session)
return ERR_PTR(-ENOMEM);
session->gdev = gdev;
session->requestor = requestor;
return session;
}
/**
* Closes a VBoxGuest session.
* @session: The session to close (and free).
*/
void vbg_core_close_session(struct vbg_session *session)
{
struct vbg_dev *gdev = session->gdev;
int i, rc;
vbg_acquire_session_capabilities(gdev, session, 0, U32_MAX, 0, true);
vbg_set_session_capabilities(gdev, session, 0, U32_MAX, true);
vbg_set_session_event_filter(gdev, session, 0, U32_MAX, true);
for (i = 0; i < ARRAY_SIZE(session->hgcm_client_ids); i++) {
if (!session->hgcm_client_ids[i])
continue;
/* requestor is kernel here, as we're cleaning up. */
vbg_hgcm_disconnect(gdev, VBG_KERNEL_REQUEST,
session->hgcm_client_ids[i], &rc);
}
kfree(session);
}
static int vbg_ioctl_chk(struct vbg_ioctl_hdr *hdr, size_t in_size,
size_t out_size)
{
if (hdr->size_in != (sizeof(*hdr) + in_size) ||
hdr->size_out != (sizeof(*hdr) + out_size))
return -EINVAL;
return 0;
}
static int vbg_ioctl_driver_version_info(
struct vbg_ioctl_driver_version_info *info)
{
const u16 vbg_maj_version = VBG_IOC_VERSION >> 16;
u16 min_maj_version, req_maj_version;
if (vbg_ioctl_chk(&info->hdr, sizeof(info->u.in), sizeof(info->u.out)))
return -EINVAL;
req_maj_version = info->u.in.req_version >> 16;
min_maj_version = info->u.in.min_version >> 16;
if (info->u.in.min_version > info->u.in.req_version ||
min_maj_version != req_maj_version)
return -EINVAL;
if (info->u.in.min_version <= VBG_IOC_VERSION &&
min_maj_version == vbg_maj_version) {
info->u.out.session_version = VBG_IOC_VERSION;
} else {
info->u.out.session_version = U32_MAX;
info->hdr.rc = VERR_VERSION_MISMATCH;
}
info->u.out.driver_version = VBG_IOC_VERSION;
info->u.out.driver_revision = 0;
info->u.out.reserved1 = 0;
info->u.out.reserved2 = 0;
return 0;
}
/* Must be called with the event_lock held */
static u32 vbg_get_allowed_event_mask_for_session(struct vbg_dev *gdev,
struct vbg_session *session)
{
u32 acquire_mode_caps = gdev->acquire_mode_guest_caps;
u32 session_acquired_caps = session->acquired_guest_caps;
u32 allowed_events = VMMDEV_EVENT_VALID_EVENT_MASK;
if ((acquire_mode_caps & VMMDEV_GUEST_SUPPORTS_GRAPHICS) &&
!(session_acquired_caps & VMMDEV_GUEST_SUPPORTS_GRAPHICS))
allowed_events &= ~VMMDEV_EVENT_DISPLAY_CHANGE_REQUEST;
if ((acquire_mode_caps & VMMDEV_GUEST_SUPPORTS_SEAMLESS) &&
!(session_acquired_caps & VMMDEV_GUEST_SUPPORTS_SEAMLESS))
allowed_events &= ~VMMDEV_EVENT_SEAMLESS_MODE_CHANGE_REQUEST;
return allowed_events;
}
static bool vbg_wait_event_cond(struct vbg_dev *gdev,
struct vbg_session *session,
u32 event_mask)
{
unsigned long flags;
bool wakeup;
u32 events;
spin_lock_irqsave(&gdev->event_spinlock, flags);
events = gdev->pending_events & event_mask;
events &= vbg_get_allowed_event_mask_for_session(gdev, session);
wakeup = events || session->cancel_waiters;
spin_unlock_irqrestore(&gdev->event_spinlock, flags);
return wakeup;
}
/* Must be called with the event_lock held */
static u32 vbg_consume_events_locked(struct vbg_dev *gdev,
struct vbg_session *session,
u32 event_mask)
{
u32 events = gdev->pending_events & event_mask;
events &= vbg_get_allowed_event_mask_for_session(gdev, session);
gdev->pending_events &= ~events;
return events;
}
static int vbg_ioctl_wait_for_events(struct vbg_dev *gdev,
struct vbg_session *session,
struct vbg_ioctl_wait_for_events *wait)
{
u32 timeout_ms = wait->u.in.timeout_ms;
u32 event_mask = wait->u.in.events;
unsigned long flags;
long timeout;
int ret = 0;
if (vbg_ioctl_chk(&wait->hdr, sizeof(wait->u.in), sizeof(wait->u.out)))
return -EINVAL;
if (timeout_ms == U32_MAX)
timeout = MAX_SCHEDULE_TIMEOUT;
else
timeout = msecs_to_jiffies(timeout_ms);
wait->u.out.events = 0;
do {
timeout = wait_event_interruptible_timeout(
gdev->event_wq,
vbg_wait_event_cond(gdev, session, event_mask),
timeout);
spin_lock_irqsave(&gdev->event_spinlock, flags);
if (timeout < 0 || session->cancel_waiters) {
ret = -EINTR;
} else if (timeout == 0) {
ret = -ETIMEDOUT;
} else {
wait->u.out.events =
vbg_consume_events_locked(gdev, session, event_mask);
}
spin_unlock_irqrestore(&gdev->event_spinlock, flags);
/*
* Someone else may have consumed the event(s) first, in
* which case we go back to waiting.
*/
} while (ret == 0 && wait->u.out.events == 0);
return ret;
}
static int vbg_ioctl_interrupt_all_wait_events(struct vbg_dev *gdev,
struct vbg_session *session,
struct vbg_ioctl_hdr *hdr)
{
unsigned long flags;
if (hdr->size_in != sizeof(*hdr) || hdr->size_out != sizeof(*hdr))
return -EINVAL;
spin_lock_irqsave(&gdev->event_spinlock, flags);
session->cancel_waiters = true;
spin_unlock_irqrestore(&gdev->event_spinlock, flags);
wake_up(&gdev->event_wq);
return 0;
}
/**
* Checks if the VMM request is allowed in the context of the given session.
* Return: 0 or negative errno value.
* @gdev: The Guest extension device.
* @session: The calling session.
* @req: The request.
*/
static int vbg_req_allowed(struct vbg_dev *gdev, struct vbg_session *session,
const struct vmmdev_request_header *req)
{
const struct vmmdev_guest_status *guest_status;
bool trusted_apps_only;
switch (req->request_type) {
/* Trusted users apps only. */
case VMMDEVREQ_QUERY_CREDENTIALS:
case VMMDEVREQ_REPORT_CREDENTIALS_JUDGEMENT:
case VMMDEVREQ_REGISTER_SHARED_MODULE:
case VMMDEVREQ_UNREGISTER_SHARED_MODULE:
case VMMDEVREQ_WRITE_COREDUMP:
case VMMDEVREQ_GET_CPU_HOTPLUG_REQ:
case VMMDEVREQ_SET_CPU_HOTPLUG_STATUS:
case VMMDEVREQ_CHECK_SHARED_MODULES:
case VMMDEVREQ_GET_PAGE_SHARING_STATUS:
case VMMDEVREQ_DEBUG_IS_PAGE_SHARED:
case VMMDEVREQ_REPORT_GUEST_STATS:
case VMMDEVREQ_REPORT_GUEST_USER_STATE:
case VMMDEVREQ_GET_STATISTICS_CHANGE_REQ:
trusted_apps_only = true;
break;
/* Anyone. */
case VMMDEVREQ_GET_MOUSE_STATUS:
case VMMDEVREQ_SET_MOUSE_STATUS:
case VMMDEVREQ_SET_POINTER_SHAPE:
case VMMDEVREQ_GET_HOST_VERSION:
case VMMDEVREQ_IDLE:
case VMMDEVREQ_GET_HOST_TIME:
case VMMDEVREQ_SET_POWER_STATUS:
case VMMDEVREQ_ACKNOWLEDGE_EVENTS:
case VMMDEVREQ_CTL_GUEST_FILTER_MASK:
case VMMDEVREQ_REPORT_GUEST_STATUS:
case VMMDEVREQ_GET_DISPLAY_CHANGE_REQ:
case VMMDEVREQ_VIDEMODE_SUPPORTED:
case VMMDEVREQ_GET_HEIGHT_REDUCTION:
case VMMDEVREQ_GET_DISPLAY_CHANGE_REQ2:
case VMMDEVREQ_VIDEMODE_SUPPORTED2:
case VMMDEVREQ_VIDEO_ACCEL_ENABLE:
case VMMDEVREQ_VIDEO_ACCEL_FLUSH:
case VMMDEVREQ_VIDEO_SET_VISIBLE_REGION:
case VMMDEVREQ_VIDEO_UPDATE_MONITOR_POSITIONS:
case VMMDEVREQ_GET_DISPLAY_CHANGE_REQEX:
case VMMDEVREQ_GET_DISPLAY_CHANGE_REQ_MULTI:
case VMMDEVREQ_GET_SEAMLESS_CHANGE_REQ:
case VMMDEVREQ_GET_VRDPCHANGE_REQ:
case VMMDEVREQ_LOG_STRING:
case VMMDEVREQ_GET_SESSION_ID:
trusted_apps_only = false;
break;
/* Depends on the request parameters... */
case VMMDEVREQ_REPORT_GUEST_CAPABILITIES:
guest_status = (const struct vmmdev_guest_status *)req;
switch (guest_status->facility) {
case VBOXGUEST_FACILITY_TYPE_ALL:
case VBOXGUEST_FACILITY_TYPE_VBOXGUEST_DRIVER:
vbg_err("Denying userspace vmm report guest cap. call facility %#08x\n",
guest_status->facility);
return -EPERM;
case VBOXGUEST_FACILITY_TYPE_VBOX_SERVICE:
trusted_apps_only = true;
break;
case VBOXGUEST_FACILITY_TYPE_VBOX_TRAY_CLIENT:
case VBOXGUEST_FACILITY_TYPE_SEAMLESS:
case VBOXGUEST_FACILITY_TYPE_GRAPHICS:
default:
trusted_apps_only = false;
break;
}
break;
/* Anything else is not allowed. */
default:
vbg_err("Denying userspace vmm call type %#08x\n",
req->request_type);
return -EPERM;
}
if (trusted_apps_only &&
(session->requestor & VMMDEV_REQUESTOR_USER_DEVICE)) {
vbg_err("Denying userspace vmm call type %#08x through vboxuser device node\n",
req->request_type);
return -EPERM;
}
return 0;
}
static int vbg_ioctl_vmmrequest(struct vbg_dev *gdev,
struct vbg_session *session, void *data)
{
struct vbg_ioctl_hdr *hdr = data;
int ret;
if (hdr->size_in != hdr->size_out)
return -EINVAL;
if (hdr->size_in > VMMDEV_MAX_VMMDEVREQ_SIZE)
return -E2BIG;
if (hdr->type == VBG_IOCTL_HDR_TYPE_DEFAULT)
return -EINVAL;
ret = vbg_req_allowed(gdev, session, data);
if (ret < 0)
return ret;
vbg_req_perform(gdev, data);
WARN_ON(hdr->rc == VINF_HGCM_ASYNC_EXECUTE);
return 0;
}
static int vbg_ioctl_hgcm_connect(struct vbg_dev *gdev,
struct vbg_session *session,
struct vbg_ioctl_hgcm_connect *conn)
{
u32 client_id;
int i, ret;
if (vbg_ioctl_chk(&conn->hdr, sizeof(conn->u.in), sizeof(conn->u.out)))
return -EINVAL;
/* Find a free place in the sessions clients array and claim it */
mutex_lock(&gdev->session_mutex);
for (i = 0; i < ARRAY_SIZE(session->hgcm_client_ids); i++) {
if (!session->hgcm_client_ids[i]) {
session->hgcm_client_ids[i] = U32_MAX;
break;
}
}
mutex_unlock(&gdev->session_mutex);
if (i >= ARRAY_SIZE(session->hgcm_client_ids))
return -EMFILE;
ret = vbg_hgcm_connect(gdev, session->requestor, &conn->u.in.loc,
&client_id, &conn->hdr.rc);
mutex_lock(&gdev->session_mutex);
if (ret == 0 && conn->hdr.rc >= 0) {
conn->u.out.client_id = client_id;
session->hgcm_client_ids[i] = client_id;
} else {
conn->u.out.client_id = 0;
session->hgcm_client_ids[i] = 0;
}
mutex_unlock(&gdev->session_mutex);
return ret;
}
static int vbg_ioctl_hgcm_disconnect(struct vbg_dev *gdev,
struct vbg_session *session,
struct vbg_ioctl_hgcm_disconnect *disconn)
{
u32 client_id;
int i, ret;
if (vbg_ioctl_chk(&disconn->hdr, sizeof(disconn->u.in), 0))
return -EINVAL;
client_id = disconn->u.in.client_id;
if (client_id == 0 || client_id == U32_MAX)
return -EINVAL;
mutex_lock(&gdev->session_mutex);
for (i = 0; i < ARRAY_SIZE(session->hgcm_client_ids); i++) {
if (session->hgcm_client_ids[i] == client_id) {
session->hgcm_client_ids[i] = U32_MAX;
break;
}
}
mutex_unlock(&gdev->session_mutex);
if (i >= ARRAY_SIZE(session->hgcm_client_ids))
return -EINVAL;
ret = vbg_hgcm_disconnect(gdev, session->requestor, client_id,
&disconn->hdr.rc);
mutex_lock(&gdev->session_mutex);
if (ret == 0 && disconn->hdr.rc >= 0)
session->hgcm_client_ids[i] = 0;
else
session->hgcm_client_ids[i] = client_id;
mutex_unlock(&gdev->session_mutex);
return ret;
}
static bool vbg_param_valid(enum vmmdev_hgcm_function_parameter_type type)
{
switch (type) {
case VMMDEV_HGCM_PARM_TYPE_32BIT:
case VMMDEV_HGCM_PARM_TYPE_64BIT:
case VMMDEV_HGCM_PARM_TYPE_LINADDR:
case VMMDEV_HGCM_PARM_TYPE_LINADDR_IN:
case VMMDEV_HGCM_PARM_TYPE_LINADDR_OUT:
return true;
default:
return false;
}
}
static int vbg_ioctl_hgcm_call(struct vbg_dev *gdev,
struct vbg_session *session, bool f32bit,
struct vbg_ioctl_hgcm_call *call)
{
size_t actual_size;
u32 client_id;
int i, ret;
if (call->hdr.size_in < sizeof(*call))
return -EINVAL;
if (call->hdr.size_in != call->hdr.size_out)
return -EINVAL;
if (call->parm_count > VMMDEV_HGCM_MAX_PARMS)
return -E2BIG;
client_id = call->client_id;
if (client_id == 0 || client_id == U32_MAX)
return -EINVAL;
actual_size = sizeof(*call);
if (f32bit)
actual_size += call->parm_count *
sizeof(struct vmmdev_hgcm_function_parameter32);
else
actual_size += call->parm_count *
sizeof(struct vmmdev_hgcm_function_parameter);
if (call->hdr.size_in < actual_size) {
vbg_debug("VBG_IOCTL_HGCM_CALL: hdr.size_in %d required size is %zd\n",
call->hdr.size_in, actual_size);
return -EINVAL;
}
call->hdr.size_out = actual_size;
/* Validate parameter types */
if (f32bit) {
struct vmmdev_hgcm_function_parameter32 *parm =
VBG_IOCTL_HGCM_CALL_PARMS32(call);
for (i = 0; i < call->parm_count; i++)
if (!vbg_param_valid(parm[i].type))
return -EINVAL;
} else {
struct vmmdev_hgcm_function_parameter *parm =
VBG_IOCTL_HGCM_CALL_PARMS(call);
for (i = 0; i < call->parm_count; i++)
if (!vbg_param_valid(parm[i].type))
return -EINVAL;
}
/*
* Validate the client id.
*/
mutex_lock(&gdev->session_mutex);
for (i = 0; i < ARRAY_SIZE(session->hgcm_client_ids); i++)
if (session->hgcm_client_ids[i] == client_id)
break;
mutex_unlock(&gdev->session_mutex);
if (i >= ARRAY_SIZE(session->hgcm_client_ids)) {
vbg_debug("VBG_IOCTL_HGCM_CALL: INVALID handle. u32Client=%#08x\n",
client_id);
return -EINVAL;
}
if (IS_ENABLED(CONFIG_COMPAT) && f32bit)
ret = vbg_hgcm_call32(gdev, session->requestor, client_id,
call->function, call->timeout_ms,
VBG_IOCTL_HGCM_CALL_PARMS32(call),
call->parm_count, &call->hdr.rc);
else
ret = vbg_hgcm_call(gdev, session->requestor, client_id,
call->function, call->timeout_ms,
VBG_IOCTL_HGCM_CALL_PARMS(call),
call->parm_count, &call->hdr.rc);
if (ret == -E2BIG) {
/* E2BIG needs to be reported through the hdr.rc field. */
call->hdr.rc = VERR_OUT_OF_RANGE;
ret = 0;
}
if (ret && ret != -EINTR && ret != -ETIMEDOUT)
vbg_err("VBG_IOCTL_HGCM_CALL error: %d\n", ret);
return ret;
}
static int vbg_ioctl_log(struct vbg_ioctl_log *log)
{
if (log->hdr.size_out != sizeof(log->hdr))
return -EINVAL;
vbg_info("%.*s", (int)(log->hdr.size_in - sizeof(log->hdr)),
log->u.in.msg);
return 0;
}
static int vbg_ioctl_change_filter_mask(struct vbg_dev *gdev,
struct vbg_session *session,
struct vbg_ioctl_change_filter *filter)
{
u32 or_mask, not_mask;
if (vbg_ioctl_chk(&filter->hdr, sizeof(filter->u.in), 0))
return -EINVAL;
or_mask = filter->u.in.or_mask;
not_mask = filter->u.in.not_mask;
if ((or_mask | not_mask) & ~VMMDEV_EVENT_VALID_EVENT_MASK)
return -EINVAL;
return vbg_set_session_event_filter(gdev, session, or_mask, not_mask,
false);
}
static int vbg_ioctl_acquire_guest_capabilities(struct vbg_dev *gdev,
struct vbg_session *session,
struct vbg_ioctl_acquire_guest_caps *caps)
{
u32 flags, or_mask, not_mask;
if (vbg_ioctl_chk(&caps->hdr, sizeof(caps->u.in), 0))
return -EINVAL;
flags = caps->u.in.flags;
or_mask = caps->u.in.or_mask;
not_mask = caps->u.in.not_mask;
if (flags & ~VBGL_IOC_AGC_FLAGS_VALID_MASK)
return -EINVAL;
if ((or_mask | not_mask) & ~VMMDEV_GUEST_CAPABILITIES_MASK)
return -EINVAL;
return vbg_acquire_session_capabilities(gdev, session, or_mask,
not_mask, flags, false);
}
static int vbg_ioctl_change_guest_capabilities(struct vbg_dev *gdev,
struct vbg_session *session, struct vbg_ioctl_set_guest_caps *caps)
{
u32 or_mask, not_mask;
int ret;
if (vbg_ioctl_chk(&caps->hdr, sizeof(caps->u.in), sizeof(caps->u.out)))
return -EINVAL;
or_mask = caps->u.in.or_mask;
not_mask = caps->u.in.not_mask;
if ((or_mask | not_mask) & ~VMMDEV_GUEST_CAPABILITIES_MASK)
return -EINVAL;
ret = vbg_set_session_capabilities(gdev, session, or_mask, not_mask,
false);
if (ret)
return ret;
caps->u.out.session_caps = session->set_guest_caps;
caps->u.out.global_caps = gdev->guest_caps_host;
return 0;
}
static int vbg_ioctl_check_balloon(struct vbg_dev *gdev,
struct vbg_ioctl_check_balloon *balloon_info)
{
if (vbg_ioctl_chk(&balloon_info->hdr, 0, sizeof(balloon_info->u.out)))
return -EINVAL;
balloon_info->u.out.balloon_chunks = gdev->mem_balloon.chunks;
/*
* Under Linux we handle VMMDEV_EVENT_BALLOON_CHANGE_REQUEST
* events entirely in the kernel, see vbg_core_isr().
*/
balloon_info->u.out.handle_in_r3 = false;
return 0;
}
static int vbg_ioctl_write_core_dump(struct vbg_dev *gdev,
struct vbg_session *session,
struct vbg_ioctl_write_coredump *dump)
{
struct vmmdev_write_core_dump *req;
if (vbg_ioctl_chk(&dump->hdr, sizeof(dump->u.in), 0))
return -EINVAL;
req = vbg_req_alloc(sizeof(*req), VMMDEVREQ_WRITE_COREDUMP,
session->requestor);
if (!req)
return -ENOMEM;
req->flags = dump->u.in.flags;
dump->hdr.rc = vbg_req_perform(gdev, req);
vbg_req_free(req, sizeof(*req));
return 0;
}
/**
* Common IOCtl for user to kernel communication.
* Return: 0 or negative errno value.
* @session: The client session.
* @req: The requested function.
* @data: The i/o data buffer, minimum size sizeof(struct vbg_ioctl_hdr).
*/
int vbg_core_ioctl(struct vbg_session *session, unsigned int req, void *data)
{
unsigned int req_no_size = req & ~IOCSIZE_MASK;
struct vbg_dev *gdev = session->gdev;
struct vbg_ioctl_hdr *hdr = data;
bool f32bit = false;
hdr->rc = VINF_SUCCESS;
if (!hdr->size_out)
hdr->size_out = hdr->size_in;
/*
* hdr->version and hdr->size_in / hdr->size_out minimum size are
* already checked by vbg_misc_device_ioctl().
*/
/* For VMMDEV_REQUEST hdr->type != VBG_IOCTL_HDR_TYPE_DEFAULT */
if (req_no_size == VBG_IOCTL_VMMDEV_REQUEST(0) ||
req == VBG_IOCTL_VMMDEV_REQUEST_BIG ||
req == VBG_IOCTL_VMMDEV_REQUEST_BIG_ALT)
return vbg_ioctl_vmmrequest(gdev, session, data);
if (hdr->type != VBG_IOCTL_HDR_TYPE_DEFAULT)
return -EINVAL;
/* Fixed size requests. */
switch (req) {
case VBG_IOCTL_DRIVER_VERSION_INFO:
return vbg_ioctl_driver_version_info(data);
case VBG_IOCTL_HGCM_CONNECT:
return vbg_ioctl_hgcm_connect(gdev, session, data);
case VBG_IOCTL_HGCM_DISCONNECT:
return vbg_ioctl_hgcm_disconnect(gdev, session, data);
case VBG_IOCTL_WAIT_FOR_EVENTS:
return vbg_ioctl_wait_for_events(gdev, session, data);
case VBG_IOCTL_INTERRUPT_ALL_WAIT_FOR_EVENTS:
return vbg_ioctl_interrupt_all_wait_events(gdev, session, data);
case VBG_IOCTL_CHANGE_FILTER_MASK:
return vbg_ioctl_change_filter_mask(gdev, session, data);
case VBG_IOCTL_ACQUIRE_GUEST_CAPABILITIES:
return vbg_ioctl_acquire_guest_capabilities(gdev, session, data);
case VBG_IOCTL_CHANGE_GUEST_CAPABILITIES:
return vbg_ioctl_change_guest_capabilities(gdev, session, data);
case VBG_IOCTL_CHECK_BALLOON:
return vbg_ioctl_check_balloon(gdev, data);
case VBG_IOCTL_WRITE_CORE_DUMP:
return vbg_ioctl_write_core_dump(gdev, session, data);
}
/* Variable sized requests. */
switch (req_no_size) {
#ifdef CONFIG_COMPAT
case VBG_IOCTL_HGCM_CALL_32(0):
f32bit = true;
fallthrough;
#endif
case VBG_IOCTL_HGCM_CALL(0):
return vbg_ioctl_hgcm_call(gdev, session, f32bit, data);
case VBG_IOCTL_LOG(0):
case VBG_IOCTL_LOG_ALT(0):
return vbg_ioctl_log(data);
}
vbg_err_ratelimited("Userspace made an unknown ioctl req %#08x\n", req);
return -ENOTTY;
}
/**
* Report guest supported mouse-features to the host.
*
* Return: 0 or negative errno value.
* @gdev: The Guest extension device.
* @features: The set of features to report to the host.
*/
int vbg_core_set_mouse_status(struct vbg_dev *gdev, u32 features)
{
struct vmmdev_mouse_status *req;
int rc;
req = vbg_req_alloc(sizeof(*req), VMMDEVREQ_SET_MOUSE_STATUS,
VBG_KERNEL_REQUEST);
if (!req)
return -ENOMEM;
req->mouse_features = features;
req->pointer_pos_x = 0;
req->pointer_pos_y = 0;
rc = vbg_req_perform(gdev, req);
if (rc < 0)
vbg_err("%s error, rc: %d\n", __func__, rc);
vbg_req_free(req, sizeof(*req));
return vbg_status_code_to_errno(rc);
}
/** Core interrupt service routine. */
irqreturn_t vbg_core_isr(int irq, void *dev_id)
{
struct vbg_dev *gdev = dev_id;
struct vmmdev_events *req = gdev->ack_events_req;
bool mouse_position_changed = false;
unsigned long flags;
u32 events = 0;
int rc;
if (!gdev->mmio->V.V1_04.have_events)
return IRQ_NONE;
/* Get and acknowlegde events. */
req->header.rc = VERR_INTERNAL_ERROR;
req->events = 0;
rc = vbg_req_perform(gdev, req);
if (rc < 0) {
vbg_err("Error performing events req, rc: %d\n", rc);
return IRQ_NONE;
}
events = req->events;
if (events & VMMDEV_EVENT_MOUSE_POSITION_CHANGED) {
mouse_position_changed = true;
events &= ~VMMDEV_EVENT_MOUSE_POSITION_CHANGED;
}
if (events & VMMDEV_EVENT_HGCM) {
wake_up(&gdev->hgcm_wq);
events &= ~VMMDEV_EVENT_HGCM;
}
if (events & VMMDEV_EVENT_BALLOON_CHANGE_REQUEST) {
schedule_work(&gdev->mem_balloon.work);
events &= ~VMMDEV_EVENT_BALLOON_CHANGE_REQUEST;
}
if (events) {
spin_lock_irqsave(&gdev->event_spinlock, flags);
gdev->pending_events |= events;
spin_unlock_irqrestore(&gdev->event_spinlock, flags);
wake_up(&gdev->event_wq);
}
if (mouse_position_changed)
vbg_linux_mouse_event(gdev);
return IRQ_HANDLED;
}