On 18.12.2023 16:19, Roger Pau Monné wrote:
> On Tue, Feb 14, 2023 at 05:11:40PM +0100, Jan Beulich wrote:
>> --- a/xen/arch/x86/domain.c
>> +++ b/xen/arch/x86/domain.c
>> @@ -2005,17 +2005,26 @@ void context_switch(struct vcpu *prev, s
>> }
>> else
>> {
>> +unsigned int feat
On 18.12.2023 16:19, Roger Pau Monné wrote:
> On Tue, Feb 14, 2023 at 05:11:40PM +0100, Jan Beulich wrote:
>> When the outgoing vCPU had IBPB issued and RSB overwritten upon entering
>> Xen, then there's no need for a 2nd barrier during context switch.
>>
>> Note that SCF_entry_ibpb is always clear
On Tue, Feb 14, 2023 at 05:11:40PM +0100, Jan Beulich wrote:
> When the outgoing vCPU had IBPB issued and RSB overwritten upon entering
> Xen, then there's no need for a 2nd barrier during context switch.
>
> Note that SCF_entry_ibpb is always clear for the idle domain, so no
> explicit idle domai
When the outgoing vCPU had IBPB issued and RSB overwritten upon entering
Xen, then there's no need for a 2nd barrier during context switch.
Note that SCF_entry_ibpb is always clear for the idle domain, so no
explicit idle domain check is needed to augment the feature check
(which is simply inappli
