From: Eduardo Habkost <ehabkost@redhat.com>
To: Borislav Petkov <bp@alien8.de>
Cc: "Paolo Bonzini" <pbonzini@redhat.com>,
"Jörg Rödel" <joro@8bytes.org>,
"Andre Przywara" <andre.przywara@arm.com>,
"kvm ML" <kvm@vger.kernel.org>,
lkml <linux-kernel@vger.kernel.org>,
"Tom Lendacky" <thomas.lendacky@amd.com>
Subject: Re: kvm: RDTSCP on AMD
Date: Mon, 10 Dec 2018 17:47:25 -0200 [thread overview]
Message-ID: <20181210194725.GM4669@habkost.net> (raw)
In-Reply-To: <20181210184153.GB5482@zn.tnic>
On Mon, Dec 10, 2018 at 07:41:53PM +0100, Borislav Petkov wrote:
> On Mon, Dec 10, 2018 at 04:37:30PM -0200, Eduardo Habkost wrote:
> > It isn't as simply as reverting commit 33b5e8c03ae7, but we can
> > surely re-add RDTSCP on pc-*-4.0 and newer.
>
> Sure. If you could only point me to an example how to add that to
> pc-*-4.0 and newer, I'll gladly cook up a patch and test it.
Sorry, I forgot to reply to this part.
See commit 33b5e8c03ae7 for reference. The differences will be:
* Instead of removing RDTSCP from builtin_x86_defs, you'll be adding it.
* Instead of adding rdtscp=on entries to PC_COMPAT_2_4, you'll
be adding rdtscp=off entries to PC_COMPAT_3_1.
PC_COMPAT_3_1 is added by the patch that creates the 4.0
machine-types. You can find it on my machine-next branch at:
http://github.com/ehabkost/qemu
--
Eduardo
next prev parent reply other threads:[~2018-12-10 19:47 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-12-10 18:13 kvm: RDTSCP on AMD Borislav Petkov
2018-12-10 18:37 ` Eduardo Habkost
2018-12-10 18:41 ` Borislav Petkov
2018-12-10 19:06 ` Eduardo Habkost
2018-12-10 19:42 ` Borislav Petkov
2018-12-10 20:08 ` Eduardo Habkost
2018-12-10 20:39 ` Borislav Petkov
2018-12-11 10:38 ` Daniel P. Berrangé
2018-12-11 11:55 ` Eduardo Habkost
2018-12-11 14:35 ` Daniel P. Berrangé
2018-12-11 15:23 ` Paolo Bonzini
2018-12-11 15:30 ` Daniel P. Berrangé
2018-12-11 16:14 ` [PATCH] target-i386: Reenable RDTSCP support on Opteron_G[345] CPU models Borislav Petkov
2018-12-12 19:52 ` Eduardo Habkost
2018-12-12 20:08 ` [PATCH -v2] target-i386: Reenable RDTSCP support on Opteron_G[345] CPU models " Borislav Petkov
2018-12-20 12:10 ` Eduardo Habkost
2018-12-10 19:47 ` Eduardo Habkost [this message]
2018-12-10 20:16 ` kvm: RDTSCP on AMD Borislav Petkov
-- strict thread matches above, loose matches on Subject: below --
2016-07-06 12:44 Borislav Petkov
2016-07-06 13:01 ` Paolo Bonzini
2016-07-06 17:34 ` Eduardo Habkost
2016-07-06 21:27 ` Paolo Bonzini
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