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Diffstat (limited to 'arch')
-rw-r--r--arch/x86/kvm/vmx.c25
1 files changed, 17 insertions, 8 deletions
diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c
index 40aa29204baf..12ed6a8f6287 100644
--- a/arch/x86/kvm/vmx.c
+++ b/arch/x86/kvm/vmx.c
@@ -2365,6 +2365,7 @@ static void vmx_save_host_state(struct kvm_vcpu *vcpu)
struct vcpu_vmx *vmx = to_vmx(vcpu);
#ifdef CONFIG_X86_64
int cpu = raw_smp_processor_id();
+ unsigned long fs_base, kernel_gs_base;
#endif
int i;
@@ -2380,12 +2381,20 @@ static void vmx_save_host_state(struct kvm_vcpu *vcpu)
vmx->host_state.gs_ldt_reload_needed = vmx->host_state.ldt_sel;
#ifdef CONFIG_X86_64
- save_fsgs_for_kvm();
- vmx->host_state.fs_sel = current->thread.fsindex;
- vmx->host_state.gs_sel = current->thread.gsindex;
-#else
- savesegment(fs, vmx->host_state.fs_sel);
- savesegment(gs, vmx->host_state.gs_sel);
+ if (likely(is_64bit_mm(current->mm))) {
+ save_fsgs_for_kvm();
+ vmx->host_state.fs_sel = current->thread.fsindex;
+ vmx->host_state.gs_sel = current->thread.gsindex;
+ fs_base = current->thread.fsbase;
+ kernel_gs_base = current->thread.gsbase;
+ } else {
+#endif
+ savesegment(fs, vmx->host_state.fs_sel);
+ savesegment(gs, vmx->host_state.gs_sel);
+#ifdef CONFIG_X86_64
+ fs_base = read_msr(MSR_FS_BASE);
+ kernel_gs_base = read_msr(MSR_KERNEL_GS_BASE);
+ }
#endif
if (!(vmx->host_state.fs_sel & 7)) {
vmcs_write16(HOST_FS_SELECTOR, vmx->host_state.fs_sel);
@@ -2405,10 +2414,10 @@ static void vmx_save_host_state(struct kvm_vcpu *vcpu)
savesegment(ds, vmx->host_state.ds_sel);
savesegment(es, vmx->host_state.es_sel);
- vmcs_writel(HOST_FS_BASE, current->thread.fsbase);
+ vmcs_writel(HOST_FS_BASE, fs_base);
vmcs_writel(HOST_GS_BASE, cpu_kernelmode_gs_base(cpu));
- vmx->msr_host_kernel_gs_base = current->thread.gsbase;
+ vmx->msr_host_kernel_gs_base = kernel_gs_base;
if (is_long_mode(&vmx->vcpu))
wrmsrl(MSR_KERNEL_GS_BASE, vmx->msr_guest_kernel_gs_base);
#else