kvm: vmx: handle invvpid vm exit gracefully

On systems with invvpid instruction support (corresponding bit in
IA32_VMX_EPT_VPID_CAP MSR is set) guest invocation of invvpid
causes vm exit, which is currently not handled and results in
propagation of unknown exit to userspace.

Fix this by installing an invvpid vm exit handler.

This is CVE-2014-3646.

Cc: stable@vger.kernel.org
Signed-off-by: Petr Matousek <pmatouse@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

diff --git a/arch/x86/include/uapi/asm/vmx.h b/arch/x86/include/uapi/asm/vmx.h
index 0e79420376eb93d51224e8ff6d41ecdf55280224..990a2fe1588d53d1c101394e5f9827f9fc63c557 100644 (file)
--- a/arch/x86/include/uapi/asm/vmx.h
+++ b/arch/x86/include/uapi/asm/vmx.h
@@ -67,6 +67,7 @@
 #define EXIT_REASON_EPT_MISCONFIG       49
 #define EXIT_REASON_INVEPT              50
 #define EXIT_REASON_PREEMPTION_TIMER    52
+#define EXIT_REASON_INVVPID             53
 #define EXIT_REASON_WBINVD              54
 #define EXIT_REASON_XSETBV              55
 #define EXIT_REASON_APIC_WRITE          56
@@ -114,6 +115,7 @@
        { EXIT_REASON_EOI_INDUCED,           "EOI_INDUCED" }, \
        { EXIT_REASON_INVALID_STATE,         "INVALID_STATE" }, \
        { EXIT_REASON_INVD,                  "INVD" }, \
+       { EXIT_REASON_INVVPID,               "INVVPID" }, \
        { EXIT_REASON_INVPCID,               "INVPCID" }
 
 #endif /* _UAPIVMX_H */

diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c
index 7e2c098b59c9a5f949200bbb0ac5f39be93c4834..cf3cd079ec5236c5827e007ea9cd2f1efa423d14 100644 (file)
--- a/arch/x86/kvm/vmx.c
+++ b/arch/x86/kvm/vmx.c
@@ -6746,6 +6746,12 @@ static int handle_invept(struct kvm_vcpu *vcpu)
        return 1;
 }
 
+static int handle_invvpid(struct kvm_vcpu *vcpu)
+{
+       kvm_queue_exception(vcpu, UD_VECTOR);
+       return 1;
+}
+
 /*
  * The exit handlers return 1 if the exit was handled fully and guest execution
  * may resume.  Otherwise they set the kvm_run parameter to indicate what needs
@@ -6791,6 +6797,7 @@ static int (*const kvm_vmx_exit_handlers[])(struct kvm_vcpu *vcpu) = {
        [EXIT_REASON_MWAIT_INSTRUCTION]       = handle_mwait,
        [EXIT_REASON_MONITOR_INSTRUCTION]     = handle_monitor,
        [EXIT_REASON_INVEPT]                  = handle_invept,
+       [EXIT_REASON_INVVPID]                 = handle_invvpid,
 };
 
 static const int kvm_vmx_max_exit_handlers =
@@ -7026,7 +7033,7 @@ static bool nested_vmx_exit_handled(struct kvm_vcpu *vcpu)
        case EXIT_REASON_VMPTRST: case EXIT_REASON_VMREAD:
        case EXIT_REASON_VMRESUME: case EXIT_REASON_VMWRITE:
        case EXIT_REASON_VMOFF: case EXIT_REASON_VMON:
-       case EXIT_REASON_INVEPT:
+       case EXIT_REASON_INVEPT: case EXIT_REASON_INVVPID:
                /*
                 * VMX instructions trap unconditionally. This allows L1 to
                 * emulate them for its L2 guest, i.e., allows 3-level nesting!