[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] Re: [Xen-devel] [PATCH] libxc: Expose the MPX cpuid flag to guest
On Mon, Jan 11, 2016 at 04:52:10PM +0800, Liang Li wrote: > If hardware support memory protect externsion, expose this feature extension > to guest by default. Users don't have to use a 'cpuid= ' option in > config file to turn it on. > > Signed-off-by: Liang Li <liang.z.li@xxxxxxxxx> > --- > tools/libxc/xc_cpufeature.h | 1 + > tools/libxc/xc_cpuid_x86.c | 6 ++++++ > 2 files changed, 7 insertions(+) > > diff --git a/tools/libxc/xc_cpufeature.h b/tools/libxc/xc_cpufeature.h > index c3ddc80..cda9305 100644 > --- a/tools/libxc/xc_cpufeature.h > +++ b/tools/libxc/xc_cpufeature.h > @@ -137,6 +137,7 @@ > #define X86_FEATURE_ERMS 9 /* Enhanced REP MOVSB/STOSB */ > #define X86_FEATURE_INVPCID 10 /* Invalidate Process Context ID */ > #define X86_FEATURE_RTM 11 /* Restricted Transactional Memory */ > +#define X86_FEATURE_MPX 14 /* Memory Protection Extensions */ > #define X86_FEATURE_RDSEED 18 /* RDSEED instruction */ > #define X86_FEATURE_ADX 19 /* ADCX, ADOX instructions */ > #define X86_FEATURE_SMAP 20 /* Supervisor Mode Access Protection */ > diff --git a/tools/libxc/xc_cpuid_x86.c b/tools/libxc/xc_cpuid_x86.c > index 8882c01..4c88db4 100644 > --- a/tools/libxc/xc_cpuid_x86.c > +++ b/tools/libxc/xc_cpuid_x86.c > @@ -423,6 +423,8 @@ static void xc_cpuid_hvm_policy(xc_interface *xch, > bitmaskof(X86_FEATURE_ERMS) | > bitmaskof(X86_FEATURE_INVPCID) | > bitmaskof(X86_FEATURE_RTM) | > + ((info->xfeature_mask != 0) ? > + bitmaskof(X86_FEATURE_MPX) : 0) | > bitmaskof(X86_FEATURE_RDSEED) | > bitmaskof(X86_FEATURE_ADX) | > bitmaskof(X86_FEATURE_SMAP) | > @@ -538,6 +540,7 @@ static void xc_cpuid_pv_policy(xc_interface *xch, > > case 0x00000007: > if ( input[1] == 0 ) > + { > regs[1] &= (bitmaskof(X86_FEATURE_BMI1) | > bitmaskof(X86_FEATURE_HLE) | > bitmaskof(X86_FEATURE_AVX2) | > @@ -547,6 +550,9 @@ static void xc_cpuid_pv_policy(xc_interface *xch, > bitmaskof(X86_FEATURE_RDSEED) | > bitmaskof(X86_FEATURE_ADX) | > bitmaskof(X86_FEATURE_FSGSBASE)); > + if ( info->xfeature_mask == 0 ) > + clear_bit(X86_FEATURE_MPX, regs[1]); > + } > else > regs[1] = 0; > regs[0] = regs[2] = regs[3] = 0; > -- > 1.9.1 > > > _______________________________________________ > Xen-devel mailing list > Xen-devel@xxxxxxxxxxxxx > http://lists.xen.org/xen-devel _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxx http://lists.xen.org/xen-devel
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