2023-08-30 17:31:07 +02:00
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// SPDX-License-Identifier: GPL-2.0
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/*
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* Hyper-V Isolation VM interface with paravisor and hypervisor
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*
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* Author:
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* Tianyu Lan <Tianyu.Lan@microsoft.com>
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*/
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#include <linux/bitfield.h>
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#include <linux/hyperv.h>
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#include <linux/types.h>
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#include <linux/slab.h>
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#include <asm/svm.h>
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#include <asm/sev.h>
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#include <asm/io.h>
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2023-10-24 12:59:35 +02:00
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#include <asm/coco.h>
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#include <asm/mem_encrypt.h>
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2023-08-30 17:31:07 +02:00
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#include <asm/mshyperv.h>
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#include <asm/hypervisor.h>
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2023-10-24 12:59:35 +02:00
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#include <asm/mtrr.h>
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2023-08-30 17:31:07 +02:00
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#ifdef CONFIG_AMD_MEM_ENCRYPT
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#define GHCB_USAGE_HYPERV_CALL 1
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union hv_ghcb {
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struct ghcb ghcb;
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struct {
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u64 hypercalldata[509];
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u64 outputgpa;
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union {
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union {
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struct {
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u32 callcode : 16;
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u32 isfast : 1;
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u32 reserved1 : 14;
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u32 isnested : 1;
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u32 countofelements : 12;
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u32 reserved2 : 4;
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u32 repstartindex : 12;
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u32 reserved3 : 4;
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};
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u64 asuint64;
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} hypercallinput;
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union {
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struct {
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u16 callstatus;
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u16 reserved1;
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u32 elementsprocessed : 12;
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u32 reserved2 : 20;
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};
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u64 asunit64;
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} hypercalloutput;
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};
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u64 reserved2;
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} hypercall;
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} __packed __aligned(HV_HYP_PAGE_SIZE);
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static u16 hv_ghcb_version __ro_after_init;
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u64 hv_ghcb_hypercall(u64 control, void *input, void *output, u32 input_size)
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{
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union hv_ghcb *hv_ghcb;
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void **ghcb_base;
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unsigned long flags;
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u64 status;
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if (!hv_ghcb_pg)
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return -EFAULT;
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WARN_ON(in_nmi());
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local_irq_save(flags);
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ghcb_base = (void **)this_cpu_ptr(hv_ghcb_pg);
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hv_ghcb = (union hv_ghcb *)*ghcb_base;
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if (!hv_ghcb) {
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local_irq_restore(flags);
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return -EFAULT;
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}
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hv_ghcb->ghcb.protocol_version = GHCB_PROTOCOL_MAX;
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hv_ghcb->ghcb.ghcb_usage = GHCB_USAGE_HYPERV_CALL;
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hv_ghcb->hypercall.outputgpa = (u64)output;
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hv_ghcb->hypercall.hypercallinput.asuint64 = 0;
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hv_ghcb->hypercall.hypercallinput.callcode = control;
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if (input_size)
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memcpy(hv_ghcb->hypercall.hypercalldata, input, input_size);
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VMGEXIT();
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hv_ghcb->ghcb.ghcb_usage = 0xffffffff;
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memset(hv_ghcb->ghcb.save.valid_bitmap, 0,
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sizeof(hv_ghcb->ghcb.save.valid_bitmap));
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status = hv_ghcb->hypercall.hypercalloutput.callstatus;
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local_irq_restore(flags);
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return status;
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}
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static inline u64 rd_ghcb_msr(void)
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{
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return __rdmsr(MSR_AMD64_SEV_ES_GHCB);
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}
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static inline void wr_ghcb_msr(u64 val)
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{
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native_wrmsrl(MSR_AMD64_SEV_ES_GHCB, val);
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}
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static enum es_result hv_ghcb_hv_call(struct ghcb *ghcb, u64 exit_code,
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u64 exit_info_1, u64 exit_info_2)
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{
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/* Fill in protocol and format specifiers */
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ghcb->protocol_version = hv_ghcb_version;
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ghcb->ghcb_usage = GHCB_DEFAULT_USAGE;
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ghcb_set_sw_exit_code(ghcb, exit_code);
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ghcb_set_sw_exit_info_1(ghcb, exit_info_1);
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ghcb_set_sw_exit_info_2(ghcb, exit_info_2);
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VMGEXIT();
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if (ghcb->save.sw_exit_info_1 & GENMASK_ULL(31, 0))
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return ES_VMM_ERROR;
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else
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return ES_OK;
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}
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2023-10-24 12:59:35 +02:00
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void __noreturn hv_ghcb_terminate(unsigned int set, unsigned int reason)
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2023-08-30 17:31:07 +02:00
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{
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u64 val = GHCB_MSR_TERM_REQ;
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/* Tell the hypervisor what went wrong. */
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val |= GHCB_SEV_TERM_REASON(set, reason);
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/* Request Guest Termination from Hypvervisor */
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wr_ghcb_msr(val);
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VMGEXIT();
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while (true)
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asm volatile("hlt\n" : : : "memory");
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}
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bool hv_ghcb_negotiate_protocol(void)
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{
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u64 ghcb_gpa;
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u64 val;
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/* Save ghcb page gpa. */
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ghcb_gpa = rd_ghcb_msr();
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/* Do the GHCB protocol version negotiation */
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wr_ghcb_msr(GHCB_MSR_SEV_INFO_REQ);
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VMGEXIT();
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val = rd_ghcb_msr();
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if (GHCB_MSR_INFO(val) != GHCB_MSR_SEV_INFO_RESP)
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return false;
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if (GHCB_MSR_PROTO_MAX(val) < GHCB_PROTOCOL_MIN ||
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GHCB_MSR_PROTO_MIN(val) > GHCB_PROTOCOL_MAX)
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return false;
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hv_ghcb_version = min_t(size_t, GHCB_MSR_PROTO_MAX(val),
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GHCB_PROTOCOL_MAX);
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/* Write ghcb page back after negotiating protocol. */
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wr_ghcb_msr(ghcb_gpa);
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VMGEXIT();
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return true;
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}
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void hv_ghcb_msr_write(u64 msr, u64 value)
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{
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union hv_ghcb *hv_ghcb;
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void **ghcb_base;
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unsigned long flags;
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if (!hv_ghcb_pg)
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return;
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WARN_ON(in_nmi());
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local_irq_save(flags);
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ghcb_base = (void **)this_cpu_ptr(hv_ghcb_pg);
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hv_ghcb = (union hv_ghcb *)*ghcb_base;
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if (!hv_ghcb) {
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local_irq_restore(flags);
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return;
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}
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ghcb_set_rcx(&hv_ghcb->ghcb, msr);
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ghcb_set_rax(&hv_ghcb->ghcb, lower_32_bits(value));
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ghcb_set_rdx(&hv_ghcb->ghcb, upper_32_bits(value));
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if (hv_ghcb_hv_call(&hv_ghcb->ghcb, SVM_EXIT_MSR, 1, 0))
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pr_warn("Fail to write msr via ghcb %llx.\n", msr);
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local_irq_restore(flags);
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}
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EXPORT_SYMBOL_GPL(hv_ghcb_msr_write);
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void hv_ghcb_msr_read(u64 msr, u64 *value)
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{
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union hv_ghcb *hv_ghcb;
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void **ghcb_base;
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unsigned long flags;
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/* Check size of union hv_ghcb here. */
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BUILD_BUG_ON(sizeof(union hv_ghcb) != HV_HYP_PAGE_SIZE);
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if (!hv_ghcb_pg)
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return;
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WARN_ON(in_nmi());
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local_irq_save(flags);
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ghcb_base = (void **)this_cpu_ptr(hv_ghcb_pg);
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hv_ghcb = (union hv_ghcb *)*ghcb_base;
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if (!hv_ghcb) {
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local_irq_restore(flags);
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return;
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}
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ghcb_set_rcx(&hv_ghcb->ghcb, msr);
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if (hv_ghcb_hv_call(&hv_ghcb->ghcb, SVM_EXIT_MSR, 0, 0))
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pr_warn("Fail to read msr via ghcb %llx.\n", msr);
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else
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*value = (u64)lower_32_bits(hv_ghcb->ghcb.save.rax)
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| ((u64)lower_32_bits(hv_ghcb->ghcb.save.rdx) << 32);
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local_irq_restore(flags);
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}
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EXPORT_SYMBOL_GPL(hv_ghcb_msr_read);
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/*
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* hv_mark_gpa_visibility - Set pages visible to host via hvcall.
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*
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* In Isolation VM, all guest memory is encrypted from host and guest
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* needs to set memory visible to host via hvcall before sharing memory
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* with host.
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*/
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static int hv_mark_gpa_visibility(u16 count, const u64 pfn[],
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enum hv_mem_host_visibility visibility)
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{
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2023-10-24 12:59:35 +02:00
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struct hv_gpa_range_for_visibility *input;
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2023-08-30 17:31:07 +02:00
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u16 pages_processed;
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u64 hv_status;
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unsigned long flags;
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/* no-op if partition isolation is not enabled */
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if (!hv_is_isolation_supported())
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return 0;
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if (count > HV_MAX_MODIFY_GPA_REP_COUNT) {
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pr_err("Hyper-V: GPA count:%d exceeds supported:%lu\n", count,
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HV_MAX_MODIFY_GPA_REP_COUNT);
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return -EINVAL;
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}
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local_irq_save(flags);
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2023-10-24 12:59:35 +02:00
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input = *this_cpu_ptr(hyperv_pcpu_input_arg);
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2023-08-30 17:31:07 +02:00
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if (unlikely(!input)) {
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local_irq_restore(flags);
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return -EINVAL;
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}
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input->partition_id = HV_PARTITION_ID_SELF;
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input->host_visibility = visibility;
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input->reserved0 = 0;
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input->reserved1 = 0;
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memcpy((void *)input->gpa_page_list, pfn, count * sizeof(*pfn));
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hv_status = hv_do_rep_hypercall(
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HVCALL_MODIFY_SPARSE_GPA_PAGE_HOST_VISIBILITY, count,
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0, input, &pages_processed);
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local_irq_restore(flags);
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if (hv_result_success(hv_status))
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return 0;
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else
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return -EFAULT;
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}
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/*
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2023-10-24 12:59:35 +02:00
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* hv_vtom_set_host_visibility - Set specified memory visible to host.
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2023-08-30 17:31:07 +02:00
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*
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* In Isolation VM, all guest memory is encrypted from host and guest
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* needs to set memory visible to host via hvcall before sharing memory
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* with host. This function works as wrap of hv_mark_gpa_visibility()
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* with memory base and size.
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*/
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2023-10-24 12:59:35 +02:00
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static bool hv_vtom_set_host_visibility(unsigned long kbuffer, int pagecount, bool enc)
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2023-08-30 17:31:07 +02:00
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{
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2023-10-24 12:59:35 +02:00
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enum hv_mem_host_visibility visibility = enc ?
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VMBUS_PAGE_NOT_VISIBLE : VMBUS_PAGE_VISIBLE_READ_WRITE;
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2023-08-30 17:31:07 +02:00
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u64 *pfn_array;
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int ret = 0;
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2023-10-24 12:59:35 +02:00
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bool result = true;
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2023-08-30 17:31:07 +02:00
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int i, pfn;
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pfn_array = kmalloc(HV_HYP_PAGE_SIZE, GFP_KERNEL);
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if (!pfn_array)
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2023-10-24 12:59:35 +02:00
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return false;
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2023-08-30 17:31:07 +02:00
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for (i = 0, pfn = 0; i < pagecount; i++) {
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pfn_array[pfn] = virt_to_hvpfn((void *)kbuffer + i * HV_HYP_PAGE_SIZE);
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pfn++;
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if (pfn == HV_MAX_MODIFY_GPA_REP_COUNT || i == pagecount - 1) {
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ret = hv_mark_gpa_visibility(pfn, pfn_array,
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visibility);
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2023-10-24 12:59:35 +02:00
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if (ret) {
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result = false;
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2023-08-30 17:31:07 +02:00
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goto err_free_pfn_array;
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2023-10-24 12:59:35 +02:00
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}
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2023-08-30 17:31:07 +02:00
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pfn = 0;
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}
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}
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err_free_pfn_array:
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kfree(pfn_array);
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2023-10-24 12:59:35 +02:00
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return result;
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2023-08-30 17:31:07 +02:00
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}
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2023-10-24 12:59:35 +02:00
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static bool hv_vtom_tlb_flush_required(bool private)
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{
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return true;
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}
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static bool hv_vtom_cache_flush_required(void)
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2023-08-30 17:31:07 +02:00
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{
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2023-10-24 12:59:35 +02:00
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return false;
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}
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2023-08-30 17:31:07 +02:00
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2023-10-24 12:59:35 +02:00
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static bool hv_is_private_mmio(u64 addr)
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{
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/*
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* Hyper-V always provides a single IO-APIC in a guest VM.
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* When a paravisor is used, it is emulated by the paravisor
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* in the guest context and must be mapped private.
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*/
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if (addr >= HV_IOAPIC_BASE_ADDRESS &&
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addr < (HV_IOAPIC_BASE_ADDRESS + PAGE_SIZE))
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return true;
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|
|
|
|
|
|
|
/* Same with a vTPM */
|
|
|
|
if (addr >= VTPM_BASE_ADDRESS &&
|
|
|
|
addr < (VTPM_BASE_ADDRESS + PAGE_SIZE))
|
|
|
|
return true;
|
|
|
|
|
|
|
|
return false;
|
|
|
|
}
|
2023-08-30 17:31:07 +02:00
|
|
|
|
2023-10-24 12:59:35 +02:00
|
|
|
void __init hv_vtom_init(void)
|
|
|
|
{
|
|
|
|
/*
|
|
|
|
* By design, a VM using vTOM doesn't see the SEV setting,
|
|
|
|
* so SEV initialization is bypassed and sev_status isn't set.
|
|
|
|
* Set it here to indicate a vTOM VM.
|
|
|
|
*/
|
|
|
|
sev_status = MSR_AMD64_SNP_VTOM;
|
|
|
|
cc_vendor = CC_VENDOR_AMD;
|
|
|
|
cc_set_mask(ms_hyperv.shared_gpa_boundary);
|
|
|
|
physical_mask &= ms_hyperv.shared_gpa_boundary - 1;
|
|
|
|
|
|
|
|
x86_platform.hyper.is_private_mmio = hv_is_private_mmio;
|
|
|
|
x86_platform.guest.enc_cache_flush_required = hv_vtom_cache_flush_required;
|
|
|
|
x86_platform.guest.enc_tlb_flush_required = hv_vtom_tlb_flush_required;
|
|
|
|
x86_platform.guest.enc_status_change_finish = hv_vtom_set_host_visibility;
|
|
|
|
|
|
|
|
/* Set WB as the default cache mode. */
|
|
|
|
mtrr_overwrite_state(NULL, 0, MTRR_TYPE_WRBACK);
|
|
|
|
}
|
2023-08-30 17:31:07 +02:00
|
|
|
|
2023-10-24 12:59:35 +02:00
|
|
|
#endif /* CONFIG_AMD_MEM_ENCRYPT */
|
2023-08-30 17:31:07 +02:00
|
|
|
|
2023-10-24 12:59:35 +02:00
|
|
|
enum hv_isolation_type hv_get_isolation_type(void)
|
|
|
|
{
|
|
|
|
if (!(ms_hyperv.priv_high & HV_ISOLATION))
|
|
|
|
return HV_ISOLATION_TYPE_NONE;
|
|
|
|
return FIELD_GET(HV_ISOLATION_TYPE, ms_hyperv.isolation_config_b);
|
2023-08-30 17:31:07 +02:00
|
|
|
}
|
2023-10-24 12:59:35 +02:00
|
|
|
EXPORT_SYMBOL_GPL(hv_get_isolation_type);
|
2023-08-30 17:31:07 +02:00
|
|
|
|
2023-10-24 12:59:35 +02:00
|
|
|
/*
|
|
|
|
* hv_is_isolation_supported - Check system runs in the Hyper-V
|
|
|
|
* isolation VM.
|
|
|
|
*/
|
|
|
|
bool hv_is_isolation_supported(void)
|
2023-08-30 17:31:07 +02:00
|
|
|
{
|
2023-10-24 12:59:35 +02:00
|
|
|
if (!cpu_feature_enabled(X86_FEATURE_HYPERVISOR))
|
|
|
|
return false;
|
|
|
|
|
|
|
|
if (!hypervisor_is_type(X86_HYPER_MS_HYPERV))
|
|
|
|
return false;
|
|
|
|
|
|
|
|
return hv_get_isolation_type() != HV_ISOLATION_TYPE_NONE;
|
|
|
|
}
|
|
|
|
|
|
|
|
DEFINE_STATIC_KEY_FALSE(isolation_type_snp);
|
|
|
|
|
|
|
|
/*
|
|
|
|
* hv_isolation_type_snp - Check system runs in the AMD SEV-SNP based
|
|
|
|
* isolation VM.
|
|
|
|
*/
|
|
|
|
bool hv_isolation_type_snp(void)
|
|
|
|
{
|
|
|
|
return static_branch_unlikely(&isolation_type_snp);
|
2023-08-30 17:31:07 +02:00
|
|
|
}
|