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Re: [PATCH] target/i386: Export RFDS bit to guests
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From: |
Pawan Gupta |
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Subject: |
Re: [PATCH] target/i386: Export RFDS bit to guests |
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Date: |
Tue, 19 Mar 2024 08:08:51 -0700 |
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