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| author | Sean Christopherson <sean.j.christopherson@intel.com> | 2018-07-23 12:32:48 -0700 |
|---|---|---|
| committer | Paolo Bonzini <pbonzini@redhat.com> | 2018-08-06 17:59:16 +0200 |
| commit | f3bbc0dcedf50d29d2d6fdfb16c5ec3e2368837f (patch) | |
| tree | 2d2d58a649b9db40b605e2c1a72015611f21127e /arch/x86/kvm/vmx.c | |
| parent | d7ee039e2bab6341cdabf42d3036063cf91b40ea (diff) | |
| download | talos-op-linux-f3bbc0dcedf50d29d2d6fdfb16c5ec3e2368837f.tar.gz talos-op-linux-f3bbc0dcedf50d29d2d6fdfb16c5ec3e2368837f.zip | |
KVM: vmx: always initialize HOST_{FS,GS}_BASE to zero during setup
The HOST_{FS,GS}_BASE fields are guaranteed to be written prior to
VMENTER, by way of vmx_prepare_switch_to_guest(). Initialize the
fields to zero for 64-bit kernels instead of pulling the base values
from their respective MSRs. In addition to eliminating two RDMSRs,
vmx_prepare_switch_to_guest() can safely assume the initial value of
the fields is zero in all cases.
Signed-off-by: Sean Christopherson <sean.j.christopherson@intel.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Diffstat (limited to 'arch/x86/kvm/vmx.c')
| -rw-r--r-- | arch/x86/kvm/vmx.c | 10 |
1 files changed, 0 insertions, 10 deletions
diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c index d0d2374a3170..60bf9a95219f 100644 --- a/arch/x86/kvm/vmx.c +++ b/arch/x86/kvm/vmx.c @@ -6361,9 +6361,6 @@ static void ept_set_mmio_spte_mask(void) */ static void vmx_vcpu_setup(struct vcpu_vmx *vmx) { -#ifdef CONFIG_X86_64 - unsigned long a; -#endif int i; if (enable_shadow_vmcs) { @@ -6418,15 +6415,8 @@ static void vmx_vcpu_setup(struct vcpu_vmx *vmx) vmcs_write16(HOST_FS_SELECTOR, 0); /* 22.2.4 */ vmcs_write16(HOST_GS_SELECTOR, 0); /* 22.2.4 */ vmx_set_constant_host_state(vmx); -#ifdef CONFIG_X86_64 - rdmsrl(MSR_FS_BASE, a); - vmcs_writel(HOST_FS_BASE, a); /* 22.2.4 */ - rdmsrl(MSR_GS_BASE, a); - vmcs_writel(HOST_GS_BASE, a); /* 22.2.4 */ -#else vmcs_writel(HOST_FS_BASE, 0); /* 22.2.4 */ vmcs_writel(HOST_GS_BASE, 0); /* 22.2.4 */ -#endif if (cpu_has_vmx_vmfunc()) vmcs_write64(VM_FUNCTION_CONTROL, 0); |
