From: Wei Liu <wl@xen.org>
To: Jan Beulich <jbeulich@suse.com>
Cc: "xen-devel@lists.xenproject.org" <xen-devel@lists.xenproject.org>,
"Ian Jackson" <iwj@xenproject.org>,
"Andrew Cooper" <andrew.cooper3@citrix.com>,
"Wei Liu" <wl@xen.org>, "Roger Pau Monné" <roger.pau@citrix.com>
Subject: Re: [PATCH] libxg: don't use max policy in xc_cpuid_xend_policy()
Date: Fri, 6 Nov 2020 15:58:39 +0000 [thread overview]
Message-ID: <20201106155839.vnhdqcptbpkbzfly@liuwe-devbox-debian-v2> (raw)
In-Reply-To: <4fa05759-24ac-5ff3-3db9-94537f6be95d@suse.com>
On Thu, Nov 05, 2020 at 04:56:53PM +0100, Jan Beulich wrote:
> Using max undermines the separation between default and max. For example,
> turning off AVX512F on an MPX-capable system silently turns on MPX,
> despite this not being part of the default policy anymore. Since the
> information is used only for determining what to convert 'x' to (but not
> to e.g. validate '1' settings), the effect of this change is identical
> for guests with (suitable) "cpuid=" settings to that of the changes
> separating default from max and then converting (e.g.) MPX from being
> part of default to only being part of max for guests without (affected)
> "cpuid=" settings.
>
> Signed-off-by: Jan Beulich <jbeulich@suse.com>
I will defer this to Andrew.
next prev parent reply other threads:[~2020-11-06 15:58 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-11-05 15:56 [PATCH] libxg: don't use max policy in xc_cpuid_xend_policy() Jan Beulich
2020-11-06 15:58 ` Wei Liu [this message]
2020-11-23 13:58 ` Jan Beulich
2021-04-01 8:08 ` Ping: " Jan Beulich
2021-04-01 11:33 ` Andrew Cooper
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