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openSUSE:12.2
xen
23853-x86-pv-cpuid-xsave.patch
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File 23853-x86-pv-cpuid-xsave.patch of Package xen
# HG changeset patch # User Shan Haitao <haitao.shan@intel.com> # Date 1316300518 -3600 # Node ID b78235de5c6407023759f9bbf723dd83887fedf0 # Parent c944e82bb092925f31403a129087e9d40e0fa06a Fix PV CPUID virtualization of XSave The patch will fix XSave CPUID virtualization for PV guests. The XSave area size returned by CPUID leaf D is changed dynamically depending on the XCR0. Tools/libxc only assigns a static value. The fix will adjust xsave area size during runtime. Note: This fix is already in HVM cpuid virtualization. And Dom0 is not affected, either. Signed-off-by: Shan Haitao <haitao.shan@intel.com> --- a/xen/arch/x86/hvm/hvm.c +++ b/xen/arch/x86/hvm/hvm.c @@ -2310,7 +2310,7 @@ void hvm_cpuid(unsigned int input, unsig { /* reset EBX to default value first */ *ebx = XSAVE_AREA_MIN_SIZE; - for ( sub_leaf = 2; sub_leaf < 64; sub_leaf++ ) + for ( sub_leaf = 2; sub_leaf < 63; sub_leaf++ ) { if ( !(v->arch.xcr0 & (1ULL << sub_leaf)) ) continue; --- a/xen/arch/x86/traps.c +++ b/xen/arch/x86/traps.c @@ -768,6 +768,30 @@ static void pv_cpuid(struct cpu_user_reg { if ( !cpuid_hypervisor_leaves(a, c, &a, &b, &c, &d) ) domain_cpuid(current->domain, a, c, &a, &b, &c, &d); + + switch ( a ) + { + case 0xd: + { + unsigned int sub_leaf, _eax, _ebx, _ecx, _edx; + /* EBX value of main leaf 0 depends on enabled xsave features */ + if ( c == 0 && current->arch.xcr0 ) + { + /* reset EBX to default value first */ + b = XSAVE_AREA_MIN_SIZE; + for ( sub_leaf = 2; sub_leaf < 63; sub_leaf++ ) + { + if ( !(current->arch.xcr0 & (1ULL << sub_leaf)) ) + continue; + domain_cpuid(current->domain, a, c, &_eax, &_ebx, &_ecx, + &_edx); + if ( (_eax + _ebx) > b ) + b = _eax + _ebx; + } + } + break; + } + } goto out; }
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