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KVM: vmx: write HOST_IA32_EFER in vmx_set_constant_host_state()

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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>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Sean Christopherson 2018-09-26 09:23:56 -07:00 committed by Paolo Bonzini
parent 09abb5e3e5
commit 5a5e8a15d7
1 changed files with 5 additions and 1 deletions
repo.diff.show_diff_stats Download patch file Download diff file Expand all files Collapse all files

4
arch/x86/kvm/vmx.c
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@ -2696,6 +2696,7 @@ static void add_atomic_switch_msr_special(struct vcpu_vmx *vmx,
u64 guest_val, u64 host_val)
{
vmcs_write64(guest_val_vmcs, guest_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);
@ -6333,6 +6334,9 @@ 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)