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x86: Fix the 64-byte boundary enumeration for extended state

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The extended state subleaves (EAX=0Dh, ECX=n, n>1).ECX[1]
indicate whether the extended state component locates
on the next 64-byte boundary following the preceding state
component when the compacted format of an XSAVE area is
used.

Right now, they are all zero because no supported component
needed the bit to be set, but the upcoming AMX feature will
use it.  Fix the subleaves value according to KVM's supported
cpuid.

Signed-off-by: Jing Liu <jing2.liu@intel.com>
Signed-off-by: Yang Zhong <yang.zhong@intel.com>
Message-Id: <20220217060434.52460-2-yang.zhong@intel.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Jing Liu 2022-02-16 22:04:27 -08:00 • committed by Paolo Bonzini
parent 1ea5208feb
commit 131266b756
3 changed files with 8 additions and 0 deletions
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1
target/i386/kvm/kvm-cpu.c
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@ -104,6 +104,7 @@ static void kvm_cpu_xsave_init(void)
if (sz != 0) {
assert(esa->size == sz);
esa->offset = kvm_arch_get_supported_cpuid(s, 0xd, i, R_EBX);
esa->ecx = kvm_arch_get_supported_cpuid(s, 0xd, i, R_ECX);
}
}
}