From: David Vrabel <david.vrabel@citrix.com>
To: Sarah Newman <srn@prgmr.com>
Cc: George Dunlap <george.dunlap@eu.citrix.com>,
David Vrabel <david.vrabel@citrix.com>,
Jan Beulich <JBeulich@suse.com>,
xen-devel <xen-devel@lists.xenproject.org>,
Boris Ostrovsky <boris.ostrovsky@oracle.com>,
Yanhai Zhu <zhu.yanhai@gmail.com>
Subject: Re: [PATCH] x86: Control CR0 TS behavior using dev_na_ts_allowed
Date: Tue, 18 Mar 2014 19:14:22 +0000 [thread overview]
Message-ID: <53289B0E.9070900@citrix.com> (raw)
In-Reply-To: <53288B71.8030703@prgmr.com>
On 18/03/14 18:07, Sarah Newman wrote:
>
> The guest cannot enable or disable this behavior but it can detect the behavior using CPUID. I
> considered making the behavior configurable from within the guest, but did not find a clean way of
> implementing it since any decision should really happen very early in the boot process. Suggestions
> on how to do this are welcome.
Consider using an Xen ELF note feature (see public/elfnote.h and
public/features.h).
e.g., XENFEAT_nm_hardware_ts
This would be a trivial one-liner to the kernel and would require no
user configurable option in the toolstack and compatibility would be
retained for guests needing the current ABI.
David
next prev parent reply other threads:[~2014-03-18 19:14 UTC|newest]
Thread overview: 67+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-03-10 16:17 [PATCHv1] x86: don't schedule when handling #NM exception David Vrabel
2014-03-10 16:40 ` H. Peter Anvin
2014-03-10 16:40 ` H. Peter Anvin
2014-03-10 17:15 ` David Vrabel
2014-03-10 17:15 ` David Vrabel
2014-03-10 17:25 ` H. Peter Anvin
2014-03-10 17:25 ` H. Peter Anvin
2014-03-17 3:13 ` Sarah Newman
2014-03-17 3:13 ` Sarah Newman
2014-03-17 3:30 ` [PATCH] x86: Control CR0 TS behavior using dev_na_ts_allowed Sarah Newman
2014-03-17 8:38 ` Jan Beulich
2014-03-17 12:42 ` George Dunlap
2014-03-17 13:35 ` Jan Beulich
2014-03-17 14:05 ` George Dunlap
2014-03-17 14:18 ` George Dunlap
2014-03-17 15:28 ` Jan Beulich
2014-03-18 18:07 ` Sarah Newman
2014-03-18 19:14 ` David Vrabel [this message]
2014-03-17 12:44 ` George Dunlap
2014-03-17 13:35 ` Jan Beulich
2014-03-18 17:48 ` Sarah Newman
2014-03-17 3:32 ` [PATCH] x86, fpu, xen: Allocate fpu state for xen pv based on PVABI behavior Sarah Newman
2014-03-17 3:32 ` Sarah Newman
2014-03-17 3:33 ` [PATCHv1] x86: don't schedule when handling #NM exception H. Peter Anvin
2014-03-17 3:35 ` Sarah Newman
2014-03-17 3:35 ` [Xen-devel] " Sarah Newman
2014-03-17 3:43 ` H. Peter Anvin
2014-03-17 4:12 ` Sarah Newman
2014-03-17 4:23 ` H. Peter Anvin
2014-03-17 4:23 ` [Xen-devel] " H. Peter Anvin
2014-03-20 0:00 ` Greg Kroah-Hartman
2014-03-20 0:00 ` [Xen-devel] " Greg Kroah-Hartman
2014-03-20 2:29 ` H. Peter Anvin
2014-03-20 2:29 ` [Xen-devel] " H. Peter Anvin
2014-03-17 4:12 ` Sarah Newman
2014-03-17 13:29 ` [Xen-devel] " David Vrabel
2014-03-19 13:21 ` Konrad Rzeszutek Wilk
2014-03-19 13:21 ` [Xen-devel] " Konrad Rzeszutek Wilk
2014-03-19 15:02 ` H. Peter Anvin
2014-03-19 15:02 ` [Xen-devel] " H. Peter Anvin
2014-06-23 13:08 ` Konrad Rzeszutek Wilk
2014-06-23 13:08 ` [Xen-devel] " Konrad Rzeszutek Wilk
2015-03-05 22:08 ` H. Peter Anvin
2015-03-05 22:08 ` [Xen-devel] " H. Peter Anvin
2015-03-06 11:46 ` [PATCHv4] x86, fpu: remove the logic of non-eager fpu mem allocation at the first usage David Vrabel
2015-03-06 11:46 ` David Vrabel
2014-03-17 13:29 ` [PATCHv1] x86: don't schedule when handling #NM exception David Vrabel
2014-03-17 3:43 ` H. Peter Anvin
2014-03-17 12:19 ` George Dunlap
2014-03-17 12:19 ` [Xen-devel] " George Dunlap
2014-03-17 16:55 ` H. Peter Anvin
2014-03-17 16:55 ` [Xen-devel] " H. Peter Anvin
2014-03-17 17:05 ` Jan Beulich
2014-03-17 17:12 ` H. Peter Anvin
2014-03-17 17:12 ` [Xen-devel] " H. Peter Anvin
2014-03-18 8:14 ` Ingo Molnar
2014-03-18 8:14 ` [Xen-devel] " Ingo Molnar
2014-03-17 17:14 ` George Dunlap
2014-03-18 18:17 ` Sarah Newman
2014-03-18 18:17 ` [Xen-devel] " Sarah Newman
2014-03-18 18:27 ` H. Peter Anvin
2014-03-18 18:27 ` H. Peter Anvin
2014-03-17 17:14 ` George Dunlap
2014-03-17 17:05 ` Jan Beulich
2014-03-17 3:33 ` H. Peter Anvin
2014-03-10 16:45 ` H. Peter Anvin
2014-03-10 16:45 ` H. Peter Anvin
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