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From: Jan Beulich <jbeulich@suse.com>
To: Roger Pau Monne <roger.pau@citrix.com>
Cc: Andrew Cooper <andrew.cooper3@citrix.com>, Wei Liu <wl@xen.org>,
	xen-devel@lists.xenproject.org
Subject: Re: [PATCH v3 2/3] amd/msr: allow passthrough of VIRT_SPEC_CTRL for HVM guests
Date: Thu, 21 Apr 2022 11:39:25 +0200	[thread overview]
Message-ID: <c5d18996-3ea6-8316-35cd-6490d4278183@suse.com> (raw)
In-Reply-To: <20220331092717.9023-3-roger.pau@citrix.com>

On 31.03.2022 11:27, Roger Pau Monne wrote:
> Allow HVM guests untrapped access to MSR_VIRT_SPEC_CTRL if the
> hardware has support for it. This requires adding logic in the
> vm{entry,exit} paths for SVM in order to context switch between the
> hypervisor value and the guest one. The added handlers for context
> switch will also be used for the legacy SSBD support.
> 
> Introduce a new synthetic feature leaf (X86_FEATURE_VIRT_SC_MSR_HVM)
> to signal whether VIRT_SPEC_CTRL needs to be handled on guest
> vm{entry,exit}.
> 
> This patch changes the annotation 's' to 'S' because it introduces
> support to expose VIRT_SSBD to guests by default when the host
> (virtual) hardware also supports it.
> 
> Suggested-by: Andrew Cooper <andrew.cooper3@citrix.com>
> Signed-off-by: Roger Pau Monné <roger.pau@citrix.com>

Reviewed-by: Jan Beulich <jbeulich@suse.com>



  reply	other threads:[~2022-04-21  9:39 UTC|newest]

Thread overview: 13+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2022-03-31  9:27 [PATCH v3 0/3] amd/msr: implement MSR_VIRT_SPEC_CTRL for HVM guests Roger Pau Monne
2022-03-31  9:27 ` [PATCH v3 1/3] amd/msr: implement VIRT_SPEC_CTRL for HVM guests on top of SPEC_CTRL Roger Pau Monne
2022-04-21  9:34   ` Jan Beulich
2022-03-31  9:27 ` [PATCH v3 2/3] amd/msr: allow passthrough of VIRT_SPEC_CTRL for HVM guests Roger Pau Monne
2022-04-21  9:39   ` Jan Beulich [this message]
2022-03-31  9:27 ` [PATCH v3 3/3] amd/msr: implement VIRT_SPEC_CTRL for HVM guests using legacy SSBD Roger Pau Monne
2022-04-21  9:50   ` Jan Beulich
2022-04-21 15:21     ` Roger Pau Monné
2022-04-21 15:27       ` Jan Beulich
2022-04-22  9:55         ` Roger Pau Monné
2022-04-22 10:01           ` Jan Beulich
2022-04-22 18:49 ` [PATCH v3 0/3] amd/msr: implement MSR_VIRT_SPEC_CTRL for HVM guests Andrew Cooper
2022-04-25 11:28   ` Roger Pau Monné

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