On 18.06.2024 17:21, Andrew Cooper wrote:
> On 18/06/2024 11:05 am, Jan Beulich wrote:
>> On 17.06.2024 19:39, Andrew Cooper wrote:
>>> --- a/xen/arch/x86/xstate.c
>>> +++ b/xen/arch/x86/xstate.c
>>> @@ -604,9 +604,164 @@ static bool valid_xcr0(uint64_t xcr0)
>>> if ( !(xcr0 & X86_XCR0_BNDREGS
On 18/06/2024 11:05 am, Jan Beulich wrote:
> On 17.06.2024 19:39, Andrew Cooper wrote:
>> Right now, xstate_ctxt_size() performs a cross-check of size with CPUID in
>> for
>> every call. This is expensive, being used for domain create/migrate, as well
>> as to service certain guest CPUID instruct
On 17.06.2024 19:39, Andrew Cooper wrote:
> Right now, xstate_ctxt_size() performs a cross-check of size with CPUID in for
> every call. This is expensive, being used for domain create/migrate, as well
> as to service certain guest CPUID instructions.
>
> Instead, arrange to check the sizes once
Right now, xstate_ctxt_size() performs a cross-check of size with CPUID in for
every call. This is expensive, being used for domain create/migrate, as well
as to service certain guest CPUID instructions.
Instead, arrange to check the sizes once at boot. See the code comments for
details. Right
