From: "Roger Pau Monné" <roger.pau@citrix.com>
To: Andrew Cooper <andrew.cooper3@citrix.com>
Cc: <xen-devel@lists.xenproject.org>, Jan Beulich <jbeulich@suse.com>,
Wei Liu <wl@xen.org>
Subject: Re: [PATCH 4/8] x86/pv: handle reads to the PAT MSR
Date: Tue, 18 Aug 2020 16:11:50 +0200 [thread overview]
Message-ID: <20200818141150.GN828@Air-de-Roger> (raw)
In-Reply-To: <ce957bd1-a0b7-a68a-68ed-2b6756809779@citrix.com>
On Tue, Aug 18, 2020 at 02:50:24PM +0100, Andrew Cooper wrote:
> On 17/08/2020 16:57, Roger Pau Monne wrote:
> > The value in the PAT MSR is part of the ABI between Xen and PV guests,
> > and there's no reason to not allow a PV guest to read it.
>
> This is faster than using RDMSR to find the constant.
>
> > Signed-off-by: Roger Pau Monné <roger.pau@citrix.com>
>
> Acked-by: Andrew Cooper <andrew.cooper3@citrix.com>
>
> (Can fix up on commit)
Sure, I didn't write it down because I assumed it would be obvious,
but worth writing down.
Thanks, Roger.
next prev parent reply other threads:[~2020-08-18 14:12 UTC|newest]
Thread overview: 21+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-08-17 15:57 [PATCH 0/8] x86: switch default MSR behavior Roger Pau Monne
2020-08-17 15:57 ` [PATCH 1/8] x86/vmx: handle writes to MISC_ENABLE MSR Roger Pau Monne
2020-08-18 14:57 ` Andrew Cooper
2020-08-17 15:57 ` [PATCH 2/8] x86/svm: silently drop writes to SYSCFG and related MSRs Roger Pau Monne
2020-08-18 14:53 ` Andrew Cooper
2020-08-19 15:07 ` Roger Pau Monné
2020-08-27 15:13 ` Jan Beulich
2020-08-17 15:57 ` [PATCH 3/8] x86/pv: handle writes to the EFER MSR Roger Pau Monne
2020-08-18 13:46 ` Andrew Cooper
2020-08-17 15:57 ` [PATCH 4/8] x86/pv: handle reads to the PAT MSR Roger Pau Monne
2020-08-18 13:50 ` Andrew Cooper
2020-08-18 14:11 ` Roger Pau Monné [this message]
2020-08-17 15:57 ` [PATCH 5/8] x86/pv: allow reading APIC_BASE MSR Roger Pau Monne
2020-08-18 14:31 ` Andrew Cooper
2020-08-17 15:57 ` [PATCH 6/8] x86/pv: allow reading FEATURE_CONTROL MSR Roger Pau Monne
2020-08-18 14:09 ` Andrew Cooper
2020-08-17 15:57 ` [PATCH 7/8] x86/pv: disallow access to unknown MSRs Roger Pau Monne
2020-08-18 14:24 ` Andrew Cooper
2020-08-17 15:57 ` [PATCH 8/8] x86/hvm: Disallow " Roger Pau Monne
2020-08-18 14:17 ` Andrew Cooper
2020-08-18 13:58 ` [PATCH 9/8] x86/msr: Drop compatibility #GP handling in guest_{rd, wr}msr() Andrew Cooper
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