From: "Jan Beulich" <JBeulich@suse.com>
To: Brian Woods <brian.woods@amd.com>,
Andrew Cooper <andrew.cooper3@citrix.com>
Cc: Xen-devel <xen-devel@lists.xen.org>,
Wei Liu <wei.liu2@citrix.com>,
Roger Pau Monne <roger.pau@citrix.com>
Subject: Re: [PATCH 8/9] x86/amd: Virtualise MSR_VIRT_SPEC_CTRL for guests
Date: Wed, 05 Dec 2018 01:41:30 -0700 [thread overview]
Message-ID: <5C078F3A0200007800203067@prv1-mh.provo.novell.com> (raw)
In-Reply-To: <20181204213522.GG13738@amd.com>
>>> On 04.12.18 at 22:35, <Brian.Woods@amd.com> wrote:
> The other thing I don't get is why advertise virtualized SSBD when the
> guest setting it does nothing? If ssbd_opt=true is set, as the code is
> now, why even advertise it to the guest? I'd suggest either allowing
> the guest to turn it off or not advertise it at all (when ssbd_opt =
> true).
I think it's better to advertise the feature nevertheless: Otherwise
the guest might either try some other way of mitigating the
(believed) vulnerability, or it may report in its logs that it's vulnerable
(without mitigation) when it really isn't.
Jan
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next prev parent reply other threads:[~2018-12-05 8:41 UTC|newest]
Thread overview: 51+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-12-03 16:18 [PATCH 0/9] xen/amd: Support for guest MSR_VIRT_SPEC_CTRL support Andrew Cooper
2018-12-03 16:18 ` [PATCH 1/9] x86/spec-ctrl: Drop the bti= command line option Andrew Cooper
2018-12-04 16:19 ` Jan Beulich
2018-12-03 16:18 ` [PATCH 2/9] x86/cpuid: Drop the synthetic X86_FEATURE_XEN_IBPB Andrew Cooper
2018-12-04 16:21 ` Jan Beulich
2018-12-03 16:18 ` [PATCH 3/9] x86/cpuid: Extend the cpuid= command line option to support all named features Andrew Cooper
2018-12-04 16:28 ` Jan Beulich
2018-12-06 12:52 ` Wei Liu
2018-12-03 16:18 ` [PATCH 4/9] x86/amd: Introduce CPUID/MSR definitions for per-vcpu SSBD support Andrew Cooper
2018-12-04 16:06 ` Woods, Brian
2018-12-05 16:39 ` Jan Beulich
2018-12-05 17:50 ` Andrew Cooper
2018-12-06 8:49 ` Jan Beulich
2018-12-06 18:35 ` Andrew Cooper
2018-12-03 16:18 ` [PATCH 5/9] x86/amd: Probe for legacy SSBD interfaces on boot Andrew Cooper
2018-12-04 16:15 ` Woods, Brian
2018-12-05 16:50 ` Jan Beulich
2018-12-05 17:09 ` Andrew Cooper
2018-12-06 8:53 ` Jan Beulich
2018-12-06 10:59 ` Jan Beulich
2018-12-28 16:30 ` Andrew Cooper
2019-01-04 8:58 ` Jan Beulich
2018-12-03 16:18 ` [PATCH 6/9] x86/amd: Allocate resources to cope with LS_CFG being per-core on Fam17h Andrew Cooper
2018-12-04 16:38 ` Woods, Brian
2018-12-05 16:57 ` Jan Beulich
2018-12-05 17:05 ` Andrew Cooper
2018-12-06 8:54 ` Jan Beulich
2018-12-06 18:46 ` Andrew Cooper
2018-12-06 19:25 ` Woods, Brian
2018-12-07 10:17 ` Jan Beulich
2018-12-03 16:18 ` [PATCH 7/9] x86/amd: Support context switching legacy SSBD interface Andrew Cooper
2018-12-04 20:27 ` Woods, Brian
2018-12-06 10:51 ` Jan Beulich
2018-12-06 18:55 ` Andrew Cooper
2018-12-07 10:25 ` Jan Beulich
2018-12-03 16:18 ` [PATCH 8/9] x86/amd: Virtualise MSR_VIRT_SPEC_CTRL for guests Andrew Cooper
2018-12-04 21:35 ` Woods, Brian
2018-12-05 8:41 ` Jan Beulich [this message]
2018-12-05 19:09 ` Andrew Cooper
2018-12-06 8:59 ` Jan Beulich
2018-12-06 19:41 ` Woods, Brian
2018-12-06 10:55 ` Jan Beulich
2018-12-03 16:18 ` [PATCH 9/9] x86/amd: Offer MSR_VIRT_SPEC_CTRL to guests Andrew Cooper
2018-12-06 10:57 ` Jan Beulich
2018-12-03 16:24 ` [PATCH 0/9] xen/amd: Support for guest MSR_VIRT_SPEC_CTRL support Jan Beulich
2018-12-03 16:31 ` Andrew Cooper
2018-12-04 9:45 ` Jan Beulich
2018-12-04 11:26 ` Andrew Cooper
2018-12-04 12:45 ` Jan Beulich
2018-12-04 13:41 ` Andrew Cooper
2018-12-04 14:07 ` Jan Beulich
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