From: David Vrabel <david.vrabel@citrix.com>
To: Razvan Cojocaru <rcojocaru@bitdefender.com>, xen-devel@lists.xen.org
Cc: keir@xen.org, george.dunlap@eu.citrix.com,
andrew.cooper3@citrix.com, ian.jackson@eu.citrix.com,
tim@xen.org, paul.durrant@citrix.com, jbeulich@suse.com,
wei.liu2@citrix.com
Subject: Re: [for-4.7] x86/emulate: synchronize LOCKed instruction emulation
Date: Thu, 14 Apr 2016 11:35:11 +0100 [thread overview]
Message-ID: <570F725F.2030209@citrix.com> (raw)
In-Reply-To: <1460550374-4344-1-git-send-email-rcojocaru@bitdefender.com>
On 13/04/16 13:26, Razvan Cojocaru wrote:
> LOCK-prefixed instructions are currenly allowed to run in parallel
> in x86_emulate(), which can lead the guest into an undefined state.
> This patch fixes the issue.
Is this sufficient? What if another VCPU is running on another PCPU and
doing an unemulated LOCK-prefixed instruction to the same memory address?
This other VCPU could be for another domain (or Xen for that matter).
David
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next prev parent reply other threads:[~2016-04-14 10:35 UTC|newest]
Thread overview: 47+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-04-13 12:26 [for-4.7] x86/emulate: synchronize LOCKed instruction emulation Razvan Cojocaru
2016-04-14 4:35 ` Jan Beulich
2016-04-14 5:56 ` Razvan Cojocaru
2016-04-14 6:09 ` Juergen Gross
2016-04-14 6:31 ` Razvan Cojocaru
2016-04-14 7:46 ` Juergen Gross
2016-04-14 8:01 ` Andrew Cooper
2016-04-14 8:18 ` Juergen Gross
2016-04-14 8:25 ` Razvan Cojocaru
2016-04-14 8:07 ` Andrew Cooper
2016-04-14 8:09 ` Razvan Cojocaru
2016-04-14 9:08 ` Razvan Cojocaru
2016-04-14 15:33 ` Jan Beulich
2016-04-14 15:44 ` Jan Beulich
2016-04-14 16:00 ` Razvan Cojocaru
2016-04-14 16:11 ` Jan Beulich
2016-04-14 8:51 ` Razvan Cojocaru
2016-04-14 15:31 ` Jan Beulich
2016-04-14 15:40 ` Razvan Cojocaru
2016-04-14 10:35 ` David Vrabel [this message]
2016-04-14 11:43 ` Razvan Cojocaru
2016-04-14 15:40 ` Jan Beulich
2016-04-14 15:45 ` Razvan Cojocaru
2016-04-14 16:08 ` Jan Beulich
2016-04-18 12:14 ` Razvan Cojocaru
2016-04-18 16:45 ` Jan Beulich
2016-04-19 11:01 ` Razvan Cojocaru
2016-04-19 16:35 ` Jan Beulich
2016-04-26 16:03 ` George Dunlap
2016-04-26 17:23 ` Razvan Cojocaru
2016-04-26 17:39 ` Andrew Cooper
2016-04-27 6:25 ` Jan Beulich
2016-04-27 7:36 ` Andrew Cooper
2016-04-27 6:22 ` Jan Beulich
2016-04-27 7:14 ` Razvan Cojocaru
2016-05-03 14:20 ` Razvan Cojocaru
2016-05-03 14:30 ` Jan Beulich
2016-05-03 14:41 ` Razvan Cojocaru
2016-05-03 15:13 ` Jan Beulich
2016-05-04 11:32 ` Razvan Cojocaru
2016-05-04 13:42 ` Jan Beulich
2016-05-05 9:25 ` Razvan Cojocaru
2016-05-05 16:38 ` Jan Beulich
2016-04-14 15:45 ` Andrew Cooper
2016-04-14 16:09 ` Jan Beulich
2016-05-13 15:27 ` Wei Liu
2016-05-13 15:51 ` Jan Beulich
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