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Re: [Qemu-devel] [PATCH 1/2] i386: define the AMD 'amd-ssbd' CPUID featu
From: |
Konrad Rzeszutek Wilk |
Subject: |
Re: [Qemu-devel] [PATCH 1/2] i386: define the AMD 'amd-ssbd' CPUID feature bit |
Date: |
Mon, 4 Jun 2018 16:20:53 -0400 |
User-agent: |
Mutt/1.8.3 (2017-05-23) |
On Mon, Jun 04, 2018 at 09:54:40AM +0100, Daniel P. Berrangé wrote:
> On Fri, Jun 01, 2018 at 11:38:08AM -0400, Konrad Rzeszutek Wilk wrote:
> > AMD future CPUs expose _two_ ways to utilize the Intel equivalant
> > of the Speculative Store Bypass Disable. The first is via
> > the virtualized VIRT_SPEC CTRL MSR (0xC001_011f) and the second
> > is via the SPEC_CTRL MSR (0x48). The document titled:
> > 124441_AMD64_SpeculativeStoreBypassDisable_Whitepaper_final.pdf
> >
> > gives priority of SPEC CTRL MSR over the VIRT SPEC CTRL MSR.
> >
> > A copy of this document is available at
> > https://bugzilla.kernel.org/show_bug.cgi?id=199889
> >
> > Anyhow, this means that on future AMD CPUs there will be _two_ ways to
> > deal with SSBD.
>
> Oh what fun ;-)
>
> Unless I'm mistaken the current Linux kernel doesn't know about these
> new amd-ssbd / amd-no-ssb flags either. Will you also be sending patches
> for that half of the problem ?
I sent them as well. But forgot to CC qemu-devel :-(
- [Qemu-devel] [PATCH QEMU] Patches for new AMD CPU bits., Konrad Rzeszutek Wilk, 2018/06/01
- [Qemu-devel] [PATCH 1/2] i386: define the AMD 'amd-ssbd' CPUID feature bit, Konrad Rzeszutek Wilk, 2018/06/01
- Re: [Qemu-devel] [PATCH 1/2] i386: define the AMD 'amd-ssbd' CPUID feature bit, Daniel P . Berrangé, 2018/06/04
- Re: [Qemu-devel] [PATCH 1/2] i386: define the AMD 'amd-ssbd' CPUID feature bit,
Konrad Rzeszutek Wilk <=
- Re: [Qemu-devel] [PATCH 1/2] i386: define the AMD 'amd-ssbd' CPUID feature bit, Eduardo Habkost, 2018/06/04
- Re: [Qemu-devel] [PATCH 1/2] i386: define the AMD 'amd-ssbd' CPUID feature bit, Daniel P . Berrangé, 2018/06/13
- Re: [Qemu-devel] [PATCH 1/2] i386: define the AMD 'amd-ssbd' CPUID feature bit, Konrad Rzeszutek Wilk, 2018/06/13
- Re: [Qemu-devel] [PATCH 1/2] i386: define the AMD 'amd-ssbd' CPUID feature bit, Daniel P . Berrangé, 2018/06/13
- Re: [Qemu-devel] [PATCH 1/2] i386: define the AMD 'amd-ssbd' CPUID feature bit, Konrad Rzeszutek Wilk, 2018/06/13
- Re: [Qemu-devel] [PATCH 1/2] i386: define the AMD 'amd-ssbd' CPUID feature bit, Daniel P . Berrangé, 2018/06/13
- Re: [Qemu-devel] [PATCH 1/2] i386: define the AMD 'amd-ssbd' CPUID feature bit, Eduardo Habkost, 2018/06/13