Re: [PATCH v5 04/19] KVM:x86: Refresh CPUID on write to guest MSR_IA32_XSS

From: Paolo Bonzini
Date: Fri Aug 04 2023 - 17:44:10 EST


On 8/4/23 18:02, Sean Christopherson wrote:
Update CPUID(EAX=0DH,ECX=1) when the guest's XSS is modified.
CPUID(EAX=0DH,ECX=1).EBX reports required storage size of
all enabled xstate features in XCR0 | XSS. Guest can allocate
sufficient xsave buffer based on the info.

Please wrap changelogs closer to ~75 chars. I'm pretty sure this isn't the first
time I've made this request...

I suspect this is because of the long "word" CPUID(EAX=0DH,ECX=1).EBX. It would make the lengths less homogeneous if lines 1 stayed the same but lines 2-4 became longer.

Paolo