Re: [PATCH] target/i386: Export RFDS bit to guests

[Xiaoyao Li]

On 3/19/2024 11:08 PM, Pawan Gupta wrote:
> On Tue, Mar 19, 2024 at 12:22:08PM +0800, Xiaoyao Li wrote:
> > On 3/13/2024 10:53 PM, Pawan Gupta wrote:
> > > Register File Data Sampling (RFDS) is a CPU side-channel vulnerability
> > > that may expose stale register value. CPUs that set RFDS_NO bit in MSR
> > > IA32_ARCH_CAPABILITIES indicate that they are not vulnerable to RFDS.
> > > Similarly, RFDS_CLEAR indicates that CPU is affected by RFDS, and has
> > > the microcode to help mitigate RFDS.
> > >
> > > Make RFDS_CLEAR and RFDS_NO bits available to guests.
> >
> > What's the status of KVM part?
>
> KVM part is already upstreamed and backported:
>
> https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?h=v6.8.1&id=50d33b98b1e23d1cd8743b3cac7a0ae5718b8b00

I see. It was not sent to kvm maillist and not merged through KVM tree.

With KVM part in palce,

Reviewed-by: Xiaoyao Li <xiaoyao.li@intel.com>