KVM: VMX: Make guest cr4 mask more conservative

Instead of specifying the bits which we want to trap on, specify the bits
which we allow the guest to change transparently.  This is safer wrt future
changes to cr4.

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

1 files changed, 6 insertions, 4 deletions

diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c
index 284e905c59d3..755811a564b3 100644
--- a/arch/x86/kvm/vmx.c
+++ b/arch/x86/kvm/vmx.c
@@ -69,8 +69,10 @@ module_param(emulate_invalid_guest_state, bool, S_IRUGO);
         (X86_CR0_WP | X86_CR0_NE | X86_CR0_TS | X86_CR0_MP)
 #define KVM_VM_CR0_ALWAYS_ON                                            \
         (KVM_VM_CR0_ALWAYS_ON_UNRESTRICTED_GUEST | X86_CR0_PG | X86_CR0_PE)
-#define KVM_GUEST_CR4_MASK                                              \
-        (X86_CR4_VME | X86_CR4_PSE | X86_CR4_PAE | X86_CR4_PGE | X86_CR4_VMXE)
+#define KVM_CR4_GUEST_OWNED_BITS                                      \
+        (X86_CR4_PVI | X86_CR4_DE | X86_CR4_PCE | X86_CR4_OSFXSR      \
+         | X86_CR4_OSXMMEXCPT)
+
 #define KVM_PMODE_VM_CR4_ALWAYS_ON (X86_CR4_PAE | X86_CR4_VMXE)
 #define KVM_RMODE_VM_CR4_ALWAYS_ON (X86_CR4_VME | X86_CR4_PAE | X86_CR4_VMXE)
 
@@ -2421,8 +2423,8 @@ static int vmx_vcpu_setup(struct vcpu_vmx *vmx)
         vmcs_write32(VM_ENTRY_CONTROLS, vmcs_config.vmentry_ctrl);
 
         vmcs_writel(CR0_GUEST_HOST_MASK, ~0UL);
-        vmcs_writel(CR4_GUEST_HOST_MASK, KVM_GUEST_CR4_MASK);
-        vmx->vcpu.arch.cr4_guest_owned_bits = ~KVM_GUEST_CR4_MASK;
+        vmx->vcpu.arch.cr4_guest_owned_bits = KVM_CR4_GUEST_OWNED_BITS;
+        vmcs_writel(CR4_GUEST_HOST_MASK, ~vmx->vcpu.arch.cr4_guest_owned_bits);
 
         tsc_base = vmx->vcpu.kvm->arch.vm_init_tsc;
         rdtscll(tsc_this);