diff options
| author | Wanpeng Li <wanpeng.li@hotmail.com> | 2017-11-29 01:31:20 -0800 |
|---|---|---|
| committer | Paolo Bonzini <pbonzini@redhat.com> | 2017-12-14 09:26:47 +0100 |
| commit | 74c55931c71352317ae0f5736ee9e4ca07ba4238 (patch) | |
| tree | 74f88584fdc28674e27d3a0785c1167f9e476370 /arch/x86/kvm/x86.c | |
| parent | 276c796cfef5bdaf9aae055f520b8857eaa3fa19 (diff) | |
KVM: VMX: Cache IA32_DEBUGCTL in memory
MSR_IA32_DEBUGCTLMSR is zeroed on VMEXIT, so it is saved/restored each
time during world switch. This patch caches the host IA32_DEBUGCTL MSR
and saves/restores the host IA32_DEBUGCTL msr when guest/host switches
to avoid to save/restore each time during world switch. This saves
about 100 clock cycles per vmexit.
Suggested-by: Jim Mattson <jmattson@google.com>
Cc: Paolo Bonzini <pbonzini@redhat.com>
Cc: Radim Krčmář <rkrcmar@redhat.com>
Cc: Jim Mattson <jmattson@google.com>
Signed-off-by: Wanpeng Li <wanpeng.li@hotmail.com>
Reviewed-by: Jim Mattson <jmattson@google.com>
Reviewed-by: David Hildenbrand <david@redhat.com>
Signed-off-by: Radim Krčmář <rkrcmar@redhat.com>
Diffstat (limited to 'arch/x86/kvm/x86.c')
0 files changed, 0 insertions, 0 deletions