On Thu, Jan 5, 2023 at 10:56 PM Andrew Cooper wrote:
> > diff --git a/xen/arch/x86/cpu/microcode/private.h
> > b/xen/arch/x86/cpu/microcode/private.h
> > index 73b095d5bf..c4c6729f56 100644
> > --- a/xen/arch/x86/cpu/microcode/private.h
> > +++ b/xen/arch/x86/cpu/microcode/private.h
> > @@ -7,6
On 05/01/2023 1:20 pm, Sergey Dyasli wrote:
> The original issue has been reported on AMD Bulldozer-based CPUs where
> ucode loading loses the LWP feature bit in order to gain the IBPB bit.
> LWP disabling is per-SMT core modification and needs to happen on each
> sibling SMT thread despite the
The original issue has been reported on AMD Bulldozer-based CPUs where
ucode loading loses the LWP feature bit in order to gain the IBPB bit.
LWP disabling is per-SMT core modification and needs to happen on each
sibling SMT thread despite the shared microcode engine. Otherwise,
logical CPUs will
