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From: "Luck, Tony" <tony.luck@intel.com>
To: speck@linutronix.de
Subject: [MODERATED] Re: [PATCH 1/2] v3 more sampling fun 1
Date: Thu, 12 Mar 2020 08:25:01 -0700	[thread overview]
Message-ID: <20200312152501.GA16899@agluck-desk2.amr.corp.intel.com> (raw)
In-Reply-To: <f9a612eb-6da5-23e9-e85e-f97fc67cda34@citrix.com>

On Thu, Mar 12, 2020 at 01:34:50AM +0000, speck for Andrew Cooper wrote:
> Particularly with this issue where it seems that no hypervisor is
> interested in offering the knob to guest kernels (so could at least
> infer based on SRBDS_CTRL), nor is there an ARCH_CAPS_$FOO_NO bit which
> could be filled in by a hypervisor on unaffected or mitigated hardware.

Maybe that is the solution?  We allocated a s/w (VMM) bit in
ARCH_CAPABILITIES for the TLB DoS issue for the nested hypervisor case.
Should we do that again for this issue?

If you think so, then we can take this discussion to Keybase so
that the other VMM vendors who hang out there can chime in.

[Note that it isn't my call to allocate a bit in ARCH_CAPABILITIES,
but I can campaign for it if folks want it].

-Tony

  reply	other threads:[~2020-03-12 15:25 UTC|newest]

Thread overview: 19+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-03-11 15:39 [MODERATED] [PATCH 0/2] v3 more sampling fun 0 mark gross
2020-01-16 22:16 ` [MODERATED] [PATCH 1/2] v3 more sampling fun 1 mark gross
2020-01-30 19:12 ` [MODERATED] [PATCH 2/2] v3 more sampling fun 2 mark gross
     [not found] ` <5e690bea.1c69fb81.16d6d.4b78SMTPIN_ADDED_BROKEN@mx.google.com>
2020-03-11 17:21   ` [MODERATED] Re: [PATCH 1/2] v3 more sampling fun 1 Greg KH
2020-03-11 23:09     ` mark gross
2020-03-11 20:02 ` Thomas Gleixner
2020-03-17 18:56   ` [MODERATED] " mark gross
2020-03-11 20:26 ` [PATCH 2/2] v3 more sampling fun 2 Thomas Gleixner
2020-03-11 20:38   ` [MODERATED] " Andrew Cooper
2020-03-11 23:23   ` mark gross
2020-03-12 22:04   ` mark gross
2020-03-13 15:21     ` Thomas Gleixner
2020-03-11 20:28 ` [MODERATED] Re: [PATCH 1/2] v3 more sampling fun 1 Andrew Cooper
2020-03-11 23:18   ` mark gross
2020-03-12  0:25     ` Luck, Tony
2020-03-12  1:34       ` Andrew Cooper
2020-03-12 15:25         ` Luck, Tony [this message]
2020-03-12 16:02           ` Luck, Tony
2020-03-12 16:45             ` Andrew Cooper

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