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 <wanpeng.li@xxxxxxxxxxxxxxx>
---
v1 -> v2:
* add F(XSAVEC) check
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..5b78e9b 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) | F(XSAVEC)))
+ 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
--
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