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Re: [Qemu-devel] [PATCH QEMU] Patches for new AMD CPU bits.

From: Eduardo Habkost
Subject: Re: [Qemu-devel] [PATCH QEMU] Patches for new AMD CPU bits.
Date: Wed, 13 Jun 2018 18:38:58 -0300
User-agent: Mutt/1.9.2 (2017-12-15)

On Fri, Jun 01, 2018 at 11:38:07AM -0400, Konrad Rzeszutek Wilk wrote:
> Hi!
> I was reading the AMD whitepaper on SSBD and noticed that they have added
> two new bits in the 8000_0008 CPUID. EBX:
>  1) Bit[26] - similar to Intel's SSB_NO not needed anymore.
>  2) Bit[24] - use SPEC_CTRL MSR (0x48) instead of VIRT SPEC_CTRL MSR
>     (0xC001_011f).
> See 124441_AMD64_SpeculativeStoreBypassDisable_Whitepaper_final.pdf
> A copy of this document is available at
>         https://bugzilla.kernel.org/show_bug.cgi?id=199889
> These two patches along with the kernel ones allow us to expose those
> two bits to the guest.

Queued on x86-next, thanks!


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