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    Subject[PATCH 3.16 061/125] Revert "KVM: x86: Increase the number of fixed MTRR regs to 10"
    Date
    3.16-stable review patch.  If anyone has any objections, please let me know.

    ------------------

    From: Paolo Bonzini <pbonzini@redhat.com>

    commit 0d234daf7e0a3290a3a20c8087eefbd6335a5bd4 upstream.

    This reverts commit 682367c494869008eb89ef733f196e99415ae862,
    which causes 32-bit SMP Windows 7 guests to panic.

    SeaBIOS has a limit on the number of MTRRs that it can handle,
    and this patch exceeded the limit. Better revert it.
    Thanks to Nadav Amit for debugging the cause.

    Reported-by: Wanpeng Li <wanpeng.li@linux.intel.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
    @@ -95,7 +95,7 @@ static inline gfn_t gfn_to_index(gfn_t g
    #define KVM_REFILL_PAGES 25
    #define KVM_MAX_CPUID_ENTRIES 80
    #define KVM_NR_FIXED_MTRR_REGION 88
    -#define KVM_NR_VAR_MTRR 10
    +#define KVM_NR_VAR_MTRR 8

    #define ASYNC_PF_PER_VCPU 64




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