The section of CPUID(EAX=0xd, ECX=1) in the spec which commit f5c2290cd01e (KVM: cpuid: mask more bits in leaf 0xd and subleaves) mentioned is older than SDM.
EBX: Bits 31-00: The size in bytes of the XSAVE area containing all states enabled by XCR0|IA32_XSS. The the value of EBX should represent the size of XCR0 related XSAVE area since IA32_XSS is not used currently. Signed-off-by: Wanpeng Li <[email protected]> --- arch/x86/kvm/cpuid.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-) diff --git a/arch/x86/kvm/cpuid.c b/arch/x86/kvm/cpuid.c index 646e6e8..70f0fa1 100644 --- a/arch/x86/kvm/cpuid.c +++ b/arch/x86/kvm/cpuid.c @@ -477,7 +477,10 @@ static inline int __do_cpuid_ent(struct kvm_cpuid_entry2 *entry, u32 function, do_cpuid_1_ent(&entry[i], function, idx); if (idx == 1) { entry[i].eax &= kvm_supported_word10_x86_features; - entry[i].ebx = 0; + if (entry[i].eax & F(XSAVES)) + entry[i].ebx = xstate_required_size(supported, true); + else + entry[i].ebx = xstate_required_size(supported, false); } else { if (entry[i].eax == 0 || !(supported & mask)) continue; -- 1.9.1 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
