[PATCH 3.4 23/44] KVM: x86: preserve the high 32-bits of the PAT register

Greg Kroah-Hartman
2014-07-08T00:11:40Z

From: Paolo Bonzini <pbonzini@redhat.com>

commit 7cb060a91c0efc5ff94f83c6df3ed705e143cdb9 upstream.

KVM does not really do much with the PAT, so this went unnoticed for a
long time. It is exposed however if you try to do rdmsr on the PAT
register.

Reported-by: Valentine Sinitsyn <valentine.sinitsyn@gmail.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
arch/x86/include/asm/kvm_host.h | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

--- a/arch/x86/include/asm/kvm_host.h
+++ b/arch/x86/include/asm/kvm_host.h
@@ -436,7 +436,7 @@ struct kvm_vcpu_arch {
bool nmi_injected; /* Trying to inject an NMI this entry */

struct mtrr_state_type mtrr_state;
- u32 pat;
+ u64 pat;

int switch_db_regs;
unsigned long db[KVM_NR_DB_REGS];