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    Subject[PATCH 3.12 112/170] KVM: x86: preserve the high 32-bits of the PAT register
    Date
    From: Paolo Bonzini <pbonzini@redhat.com>

    3.12-stable review patch. If anyone has any objections, please let me know.

    ===============

    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: Jiri Slaby <jslaby@suse.cz>
    ---
    arch/x86/include/asm/kvm_host.h | 2 +-
    1 file changed, 1 insertion(+), 1 deletion(-)

    diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_host.h
    index 792206c8e555..694851592399 100644
    --- a/arch/x86/include/asm/kvm_host.h
    +++ b/arch/x86/include/asm/kvm_host.h
    @@ -455,7 +455,7 @@ 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];
    --
    2.0.0


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