>>> On 01.06.11 at 16:31, "Yang, Wei Y" <wei.y.yang@xxxxxxxxx> wrote:
> This patch disallows SMEP for PV guest.
How about Dom0?
Jan
> Signed-off-by: Yang, Wei <wei.y.yang@xxxxxxxxx>
> Signed-off-by: Shan, Haitao <haitao.shan@xxxxxxxxx>
> Signed-off-by: Li, Xin <xin.li@xxxxxxxxx>
>
> ---
> xc_cpufeature.h | 3 +++
> xc_cpuid_x86.c | 5 +++++
> 2 files changed, 8 insertions(+)
>
> diff -r 6f72160d2d55 tools/libxc/xc_cpufeature.h
> --- a/tools/libxc/xc_cpufeature.h Wed Jun 01 19:57:32 2011 +0800
> +++ b/tools/libxc/xc_cpufeature.h Wed Jun 01 22:21:33 2011 +0800
> @@ -141,4 +141,7 @@
> #define X86_FEATURE_TBM (6*32+21) /* trailing bit manipulations */
> #define X86_FEATURE_TOPOEXT (6*32+22) /* topology extensions CPUID
> leafs */
>
> +/* Intel-defined CPU features, CPUID level 0x00000007:0 (ebx), word 7 */
> +#define X86_FEATURE_SMEP (7*32+ 7) /* Supervisor Mode Execution
> Protection */
> +
> #endif /* __LIBXC_CPUFEATURE_H */
> diff -r 6f72160d2d55 tools/libxc/xc_cpuid_x86.c
> --- a/tools/libxc/xc_cpuid_x86.c Wed Jun 01 19:57:32 2011 +0800
> +++ b/tools/libxc/xc_cpuid_x86.c Wed Jun 01 22:21:33 2011 +0800
> @@ -470,6 +470,11 @@
> xc_cpuid_config_xsave(xch, domid, xfeature_mask, input, regs);
> break;
>
> + case 7:
> + if ( input[1] == 0 )
> + clear_bit(X86_FEATURE_SMEP, regs[1]);
> + break;
> +
> case 0x80000001:
> if ( !guest_64bit )
> {
>
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