mirror of
https://kernel.googlesource.com/pub/scm/linux/kernel/git/torvalds/linux
synced 2025-11-04 08:34:47 +10:00
94dfbdb389
We only have to save/restore MSR_GS_BASE on every VMEXIT. The rest can be saved/restored when we leave the VCPU. Since we don't emulate the DEBUGCTL MSRs and the guest cannot write to them, we don't have to worry about saving/restoring them at all. This shaves a whopping 40% off raw vmexit costs on AMD. Signed-off-by: Anthony Liguori <aliguori@us.ibm.com> Signed-off-by: Avi Kivity <avi@qumranet.com>
43 lines
857 B
C
43 lines
857 B
C
#ifndef __KVM_SVM_H
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#define __KVM_SVM_H
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#include <linux/kernel.h>
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#include <linux/types.h>
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#include <linux/list.h>
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#include <asm/msr.h>
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#include "svm.h"
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#include "kvm.h"
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static const u32 host_save_user_msrs[] = {
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#ifdef CONFIG_X86_64
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MSR_STAR, MSR_LSTAR, MSR_CSTAR, MSR_SYSCALL_MASK, MSR_KERNEL_GS_BASE,
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MSR_FS_BASE,
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#endif
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MSR_IA32_SYSENTER_CS, MSR_IA32_SYSENTER_ESP, MSR_IA32_SYSENTER_EIP,
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};
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#define NR_HOST_SAVE_USER_MSRS ARRAY_SIZE(host_save_user_msrs)
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#define NUM_DB_REGS 4
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struct vcpu_svm {
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struct vmcb *vmcb;
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unsigned long vmcb_pa;
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struct svm_cpu_data *svm_data;
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uint64_t asid_generation;
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unsigned long db_regs[NUM_DB_REGS];
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u64 next_rip;
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u64 host_user_msrs[NR_HOST_SAVE_USER_MSRS];
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u64 host_gs_base;
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unsigned long host_cr2;
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unsigned long host_db_regs[NUM_DB_REGS];
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unsigned long host_dr6;
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unsigned long host_dr7;
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};
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#endif
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