diff options
Diffstat (limited to 'arch/x86/kvm/vmx.c')
| -rw-r--r-- | arch/x86/kvm/vmx.c | 13 |
1 files changed, 10 insertions, 3 deletions
diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c index 4937e11f971a..b23ecc04ca51 100644 --- a/arch/x86/kvm/vmx.c +++ b/arch/x86/kvm/vmx.c @@ -226,6 +226,8 @@ struct vmcs { struct vmcs_host_state { unsigned long cr3; /* May not match real cr3 */ unsigned long cr4; /* May not match real cr4 */ + unsigned long gs_base; + unsigned long fs_base; u16 fs_sel, gs_sel, ldt_sel; #ifdef CONFIG_X86_64 @@ -2731,9 +2733,14 @@ static void vmx_prepare_switch_to_guest(struct kvm_vcpu *vcpu) vmcs_write16(HOST_GS_SELECTOR, 0); host_state->gs_sel = gs_sel; } - - vmcs_writel(HOST_FS_BASE, fs_base); - vmcs_writel(HOST_GS_BASE, gs_base); + if (unlikely(fs_base != host_state->fs_base)) { + vmcs_writel(HOST_FS_BASE, fs_base); + host_state->fs_base = fs_base; + } + if (unlikely(gs_base != host_state->gs_base)) { + vmcs_writel(HOST_GS_BASE, gs_base); + host_state->gs_base = gs_base; + } for (i = 0; i < vmx->save_nmsrs; ++i) kvm_set_shared_msr(vmx->guest_msrs[i].index, |