KVM: x86: preserve the high 32-bits of the PAT register

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>

diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_host.h
index bef5dd6..3092300 100644 (file)
--- a/arch/x86/include/asm/kvm_host.h
+++ b/arch/x86/include/asm/kvm_host.h
@@ -462,7 +462,7 @@ 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];