| Message ID | 20180828160459.14093-17-sean.j.christopherson@intel.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | KVM: nVMX: add option to perform early consistency checks via H/W | expand |
On Tue, Aug 28, 2018 at 9:04 AM, Sean Christopherson <sean.j.christopherson@intel.com> wrote: > EFER is constant in the host and writing it once during setup means > we can skip writing the host value in add_atomic_switch_msr_special(). > > Signed-off-by: Sean Christopherson <sean.j.christopherson@intel.com> Reviewed-by: Jim Mattson <jmattson@google.com>
diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c index 1edf82632832..3d826550cc9d 100644 --- a/arch/x86/kvm/vmx.c +++ b/arch/x86/kvm/vmx.c @@ -2697,7 +2697,8 @@ static void add_atomic_switch_msr_special(struct vcpu_vmx *vmx, u64 guest_val, u64 host_val) { vmcs_write64(guest_val_vmcs, guest_val); - vmcs_write64(host_val_vmcs, host_val); + if (host_val_vmcs != HOST_IA32_EFER) + vmcs_write64(host_val_vmcs, host_val); vm_entry_controls_setbit(vmx, entry); vm_exit_controls_setbit(vmx, exit); } @@ -6329,6 +6330,9 @@ static void vmx_set_constant_host_state(struct vcpu_vmx *vmx) rdmsr(MSR_IA32_CR_PAT, low32, high32); vmcs_write64(HOST_IA32_PAT, low32 | ((u64) high32 << 32)); } + + if (cpu_has_load_ia32_efer) + vmcs_write64(HOST_IA32_EFER, host_efer); } static void set_cr4_guest_host_mask(struct vcpu_vmx *vmx)
EFER is constant in the host and writing it once during setup means we can skip writing the host value in add_atomic_switch_msr_special(). Signed-off-by: Sean Christopherson <sean.j.christopherson@intel.com> --- arch/x86/kvm/vmx.c | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-)