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From: "Raj, Ashok" <ashok.raj@intel.com>
To: Chao Gao <chao.gao@intel.com>
Cc: Sergey Dyasli <sergey.dyasli@citrix.com>,
	Kevin Tian <kevin.tian@intel.com>,
	Jan Beulich <JBeulich@suse.com>, WeiLiu <wl@xen.org>,
	Andrew Cooper <andrew.cooper3@citrix.com>,
	Jun Nakajima <jun.nakajima@intel.com>,
	Ashok Raj <ashok.raj@intel.com>,
	xen-devel <xen-devel@lists.xenproject.org>,
	tglx@linutronix.de, Borislav Petkov <bp@suse.de>,
	Roger Pau Monne <roger.pau@citrix.com>
Subject: Re: [Xen-devel] [PATCH v7 08/10] x86/microcode: Synchronize late microcode loading
Date: Tue, 11 Jun 2019 08:47:08 -0700	[thread overview]
Message-ID: <20190611154708.GA44426@otc-nc-03> (raw)
In-Reply-To: <20190611123615.GA22930@gao-cwp>

Hi Gao, Jan

On Tue, Jun 11, 2019 at 08:36:17PM +0800, Chao Gao wrote:
> On Wed, Jun 05, 2019 at 08:09:43AM -0600, Jan Beulich wrote:
> >
> >There's no comment here and nothing in the description: I don't
> >recall clarification as to whether RDTSC is fine to be issued by a
> >thread when ucode is being updated by another thread on the
> >same core.
> 
> Yes. I think it is fine.
> 
> Ashok, could you share your opinion on this question?
> 

Yes, rdtsc should be fine for other threads to execute while waiting for the 
microcode update to complete on others. We do the same in Linux as well.

Cheers,
Ashok

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  parent reply	other threads:[~2019-06-11 15:47 UTC|newest]

Thread overview: 64+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-05-27  8:31 [PATCH v7 00/10] improve late microcode loading Chao Gao
2019-05-27  8:31 ` [Xen-devel] " Chao Gao
2019-05-27  8:31 ` [PATCH v7 01/10] misc/xen-ucode: Upload a microcode blob to the hypervisor Chao Gao
2019-05-27  8:31   ` [Xen-devel] " Chao Gao
2019-06-04 16:14   ` Andrew Cooper
2019-06-04 16:23     ` Jan Beulich
2019-06-06  2:29     ` Chao Gao
2019-05-27  8:31 ` [PATCH v7 02/10] microcode/intel: extend microcode_update_match() Chao Gao
2019-05-27  8:31   ` [Xen-devel] " Chao Gao
2019-06-04 14:39   ` Jan Beulich
2019-06-05 13:22     ` Roger Pau Monné
2019-06-05 14:16       ` Jan Beulich
2019-06-06  8:26     ` Chao Gao
2019-06-06  9:01       ` Jan Beulich
2019-05-27  8:31 ` [PATCH v7 03/10] microcode: introduce a global cache of ucode patch Chao Gao
2019-05-27  8:31   ` [Xen-devel] " Chao Gao
2019-06-04 15:03   ` Jan Beulich
2019-06-10  5:33     ` Chao Gao
2019-06-11  6:50       ` Jan Beulich
2019-05-27  8:31 ` [PATCH v7 04/10] microcode: remove struct ucode_cpu_info Chao Gao
2019-05-27  8:31   ` [Xen-devel] " Chao Gao
2019-06-04 15:13   ` Jan Beulich
2019-06-10  7:19     ` Chao Gao
2019-05-27  8:31 ` [PATCH v7 05/10] microcode: remove pointless 'cpu' parameter Chao Gao
2019-05-27  8:31   ` [Xen-devel] " Chao Gao
2019-06-04 15:29   ` Jan Beulich
2019-06-10  7:31     ` Chao Gao
2019-05-27  8:31 ` [PATCH v7 06/10] microcode: split out apply_microcode() from cpu_request_microcode() Chao Gao
2019-05-27  8:31   ` [Xen-devel] " Chao Gao
2019-06-05 12:37   ` Jan Beulich
2019-06-11  3:32     ` Chao Gao
2019-06-11  7:08       ` Jan Beulich
2019-06-11  8:53         ` Chao Gao
2019-06-11  9:15           ` Jan Beulich
2019-05-27  8:31 ` [PATCH v7 07/10] microcode/intel: Writeback and invalidate caches before updating microcode Chao Gao
2019-05-27  8:31   ` [Xen-devel] " Chao Gao
2019-06-05 13:20   ` Jan Beulich
2019-05-27  8:31 ` [PATCH v7 08/10] x86/microcode: Synchronize late microcode loading Chao Gao
2019-05-27  8:31   ` [Xen-devel] " Chao Gao
2019-06-05 14:09   ` Jan Beulich
2019-06-11 12:36     ` Chao Gao
2019-06-11 12:58       ` Jan Beulich
2019-06-11 15:47       ` Raj, Ashok [this message]
2019-06-05 14:42   ` Roger Pau Monné
2019-05-27  8:31 ` [PATCH v7 09/10] microcode: remove microcode_update_lock Chao Gao
2019-05-27  8:31   ` [Xen-devel] " Chao Gao
2019-06-05 14:52   ` Roger Pau Monné
2019-06-05 15:15     ` Jan Beulich
2019-06-05 14:53   ` Jan Beulich
2019-06-11 12:46     ` Chao Gao
2019-06-11 13:23       ` Jan Beulich
2019-06-11 16:04       ` Raj, Ashok
2019-06-12  7:38         ` Jan Beulich
2019-06-13 14:05           ` Chao Gao
2019-06-13 14:08             ` Jan Beulich
2019-06-13 14:58               ` Chao Gao
2019-06-13 17:47               ` Raj, Ashok
2019-06-14  8:58                 ` Jan Beulich
2019-05-27  8:31 ` [PATCH v7 10/10] x86/microcode: always collect_cpu_info() during boot Chao Gao
2019-05-27  8:31   ` [Xen-devel] " Chao Gao
2019-06-05 14:56   ` Roger Pau Monné
2019-06-11 13:02     ` Chao Gao
2019-06-05 15:05   ` Jan Beulich
2019-06-11 12:58     ` Chao Gao

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