On Wed, Oct 12, 2022 at 10:26:19AM +0200, Jan Beulich wrote:
> On 11.10.2022 18:02, Roger Pau Monne wrote:
> > @@ -140,6 +135,7 @@ __UNLIKELY_END(nsvm_hap)
> > */
> > stgi
> > GLOBAL(svm_stgi_label)
> > +
> > mov %rsp,%rdi
> > call svm_vmexit_handler
> >
On 11.10.2022 18:02, Roger Pau Monne wrote:
> @@ -140,6 +135,7 @@ __UNLIKELY_END(nsvm_hap)
> */
> stgi
> GLOBAL(svm_stgi_label)
> +
> mov %rsp,%rdi
> call svm_vmexit_handler
> jmp .Lsvm_do_resume
Seemingly stray change?
> ---
The current logic for AMD SSBD context switches it on every
vm{entry,exit} if the Xen and guest selections don't match. This is
expensive when not using SPEC_CTRL, and hence should be avoided as
much as possible.
When SSBD is not being set from SPEC_CTRL on AMD don't context switch
at
