KVM: VMX: Fix host userspace gsbase corruption

We now use load_gs_index() to load gs safely; unfortunately this also
changes MSR_KERNEL_GS_BASE, which we managed separately.  This resulted
in confusion and breakage running 32-bit host userspace on a 64-bit kernel.

Fix by
- saving guest MSR_KERNEL_GS_BASE before we we reload the host's gs
- doing the host save/load unconditionally, instead of only when in guest
  long mode

Things can be cleaned up further, but this is the minmal fix for now.

Signed-off-by: Avi Kivity <avi@redhat.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>

diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c
index 6fe7df7..ff21fdd 100644 (file)
--- a/arch/x86/kvm/vmx.c
+++ b/arch/x86/kvm/vmx.c
@@ -821,10 +821,9 @@ static void vmx_save_host_state(struct kvm_vcpu *vcpu)
 #endif
 
 #ifdef CONFIG_X86_64
-       if (is_long_mode(&vmx->vcpu)) {
-               rdmsrl(MSR_KERNEL_GS_BASE, vmx->msr_host_kernel_gs_base);
+       rdmsrl(MSR_KERNEL_GS_BASE, vmx->msr_host_kernel_gs_base);
+       if (is_long_mode(&vmx->vcpu))
                wrmsrl(MSR_KERNEL_GS_BASE, vmx->msr_guest_kernel_gs_base);
-       }
 #endif
        for (i = 0; i < vmx->save_nmsrs; ++i)
                kvm_set_shared_msr(vmx->guest_msrs[i].index,
@@ -839,11 +838,14 @@ static void __vmx_load_host_state(struct vcpu_vmx *vmx)
 
        ++vmx->vcpu.stat.host_state_reload;
        vmx->host_state.loaded = 0;
+#ifdef CONFIG_X86_64
+       if (is_long_mode(&vmx->vcpu))
+               rdmsrl(MSR_KERNEL_GS_BASE, vmx->msr_guest_kernel_gs_base);
+#endif
        if (vmx->host_state.gs_ldt_reload_needed) {
                kvm_load_ldt(vmx->host_state.ldt_sel);
 #ifdef CONFIG_X86_64
                load_gs_index(vmx->host_state.gs_sel);
-               wrmsrl(MSR_KERNEL_GS_BASE, current->thread.gs);
 #else
                loadsegment(gs, vmx->host_state.gs_sel);
 #endif
@@ -852,10 +854,7 @@ static void __vmx_load_host_state(struct vcpu_vmx *vmx)
                loadsegment(fs, vmx->host_state.fs_sel);
        reload_tss();
 #ifdef CONFIG_X86_64
-       if (is_long_mode(&vmx->vcpu)) {
-               rdmsrl(MSR_KERNEL_GS_BASE, vmx->msr_guest_kernel_gs_base);
-               wrmsrl(MSR_KERNEL_GS_BASE, vmx->msr_host_kernel_gs_base);
-       }
+       wrmsrl(MSR_KERNEL_GS_BASE, vmx->msr_host_kernel_gs_base);
 #endif
        if (current_thread_info()->status & TS_USEDFPU)
                clts();