[MODERATED] Re: [patch V5 12/14] MDS basics 12

mark gross <[email protected]>
Newsgroups org.kernel.lore.historical-speck
Message-ID <[email protected]> 
On Wed, Feb 27, 2019 at 04:09:51PM +0100, speck for Thomas Gleixner wrote:
> Subject: [patch V5 12/14] x86/speculation/mds: Add mitigation mode VMWERV
> From: Thomas Gleixner <[email protected]>
> 
> In virtualized environments it can happen that the host has the microcode
> update which utilizes the VERW instruction to clear CPU buffers, but the
> hypervisor is not yet updated to expose the X86_FEATURE_MD_CLEAR CPUID bit
> to guests.
> 
> Introduce an internal mitigation mode VWWERV which enables the invocation
                                       ^VMWERV
--mark
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