mirror of
https://github.com/torvalds/linux.git
synced 2024-12-22 10:56:40 +00:00
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
|
|
#define __KVM_SVM_H
|
|
|
|
#include <linux/kernel.h>
|
|
#include <linux/types.h>
|
|
#include <linux/list.h>
|
|
#include <asm/msr.h>
|
|
|
|
#include "svm.h"
|
|
#include "kvm.h"
|
|
|
|
static const u32 host_save_user_msrs[] = {
|
|
#ifdef CONFIG_X86_64
|
|
MSR_STAR, MSR_LSTAR, MSR_CSTAR, MSR_SYSCALL_MASK, MSR_KERNEL_GS_BASE,
|
|
MSR_FS_BASE,
|
|
#endif
|
|
MSR_IA32_SYSENTER_CS, MSR_IA32_SYSENTER_ESP, MSR_IA32_SYSENTER_EIP,
|
|
};
|
|
|
|
#define NR_HOST_SAVE_USER_MSRS ARRAY_SIZE(host_save_user_msrs)
|
|
#define NUM_DB_REGS 4
|
|
|
|
struct vcpu_svm {
|
|
struct vmcb *vmcb;
|
|
unsigned long vmcb_pa;
|
|
struct svm_cpu_data *svm_data;
|
|
uint64_t asid_generation;
|
|
|
|
unsigned long db_regs[NUM_DB_REGS];
|
|
|
|
u64 next_rip;
|
|
|
|
u64 host_user_msrs[NR_HOST_SAVE_USER_MSRS];
|
|
u64 host_gs_base;
|
|
unsigned long host_cr2;
|
|
unsigned long host_db_regs[NUM_DB_REGS];
|
|
unsigned long host_dr6;
|
|
unsigned long host_dr7;
|
|
};
|
|
|
|
#endif
|
|
|