From: Andrew Cooper <andrew.cooper3@citrix.com>
To: Chao Gao <chao.gao@intel.com>, <xen-devel@lists.xenproject.org>
Cc: "Sergey Dyasli" <sergey.dyasli@citrix.com>,
"Jan Beulich" <jbeulich@suse.com>,
"Ashok Raj" <ashok.raj@intel.com>, "Wei Liu" <wl@xen.org>,
"Roger Pau Monné" <roger.pau@citrix.com>
Subject: Re: [Xen-devel] [PATCH v10 15/16] microcode: disable late loading if CPUs are affected by BDF90
Date: Fri, 13 Sep 2019 13:23:36 +0100 [thread overview]
Message-ID: <30ac3010-378c-5d19-eab0-d651fbf14db0@citrix.com> (raw)
In-Reply-To: <1568272949-1086-16-git-send-email-chao.gao@intel.com>
On 12/09/2019 08:22, Chao Gao wrote:
> It ports the implementation of is_blacklisted() in linux kernel
> to Xen.
>
> Late loading may cause system hang if CPUs are affected by BDF90.
> Check against BDF90 before performing a late loading.
>
> Signed-off-by: Chao Gao <chao.gao@intel.com>
There is an Intel-blessed workaround for this issue, which is to perform
parallel loading and issue a WBINVD inside the rendezvous, which is
being used in production by a number of vendors.
We should prohibit late loading cases which we know to be broken, but
parallel loading should be permitted.
~Andrew
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next prev parent reply other threads:[~2019-09-13 12:24 UTC|newest]
Thread overview: 41+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-09-12 7:22 [Xen-devel] [PATCH v10 00/16] improve late microcode loading Chao Gao
2019-09-12 7:22 ` [Xen-devel] [PATCH v10 01/16] microcode/intel: extend microcode_update_match() Chao Gao
2019-09-12 10:24 ` Jan Beulich
2019-09-13 6:50 ` Jan Beulich
2019-09-13 7:02 ` Chao Gao
2019-09-12 7:22 ` [Xen-devel] [PATCH v10 02/16] microcode/amd: distinguish old and mismatched ucode in microcode_fits() Chao Gao
2019-09-12 7:22 ` [Xen-devel] [PATCH v10 03/16] microcode: introduce a global cache of ucode patch Chao Gao
2019-09-12 10:29 ` Jan Beulich
2019-09-12 7:22 ` [Xen-devel] [PATCH v10 04/16] microcode: clean up microcode_resume_cpu Chao Gao
2019-09-12 7:22 ` [Xen-devel] [PATCH v10 05/16] microcode: remove struct ucode_cpu_info Chao Gao
2019-09-12 7:22 ` [Xen-devel] [PATCH v10 06/16] microcode: remove pointless 'cpu' parameter Chao Gao
2019-09-12 7:22 ` [Xen-devel] [PATCH v10 07/16] microcode/amd: call svm_host_osvw_init() in common code Chao Gao
2019-09-12 12:34 ` Jan Beulich
2019-09-12 7:22 ` [Xen-devel] [PATCH v10 08/16] microcode: pass a patch pointer to apply_microcode() Chao Gao
2019-09-12 7:22 ` [Xen-devel] [PATCH v10 09/16] microcode: split out apply_microcode() from cpu_request_microcode() Chao Gao
2019-09-12 14:07 ` Jan Beulich
2019-09-13 6:47 ` Chao Gao
2019-09-12 7:22 ` [Xen-devel] [PATCH v10 10/16] microcode: unify ucode loading during system bootup and resuming Chao Gao
2019-09-12 14:59 ` Jan Beulich
2019-09-12 7:22 ` [Xen-devel] [PATCH v10 11/16] microcode: reduce memory allocation and copy when creating a patch Chao Gao
2019-09-12 15:04 ` Jan Beulich
2019-09-12 7:22 ` [Xen-devel] [PATCH v10 12/16] x86/microcode: Synchronize late microcode loading Chao Gao
2019-09-12 15:32 ` Jan Beulich
2019-09-13 7:01 ` Chao Gao
2019-09-13 7:15 ` Jan Beulich
2019-09-12 7:22 ` [Xen-devel] [PATCH v10 13/16] microcode: remove microcode_update_lock Chao Gao
2019-09-12 7:22 ` [Xen-devel] [PATCH v10 14/16] microcode: rendezvous CPUs in NMI handler and load ucode Chao Gao
2019-09-13 9:14 ` Jan Beulich
2019-09-16 3:18 ` Chao Gao
2019-09-16 8:22 ` Jan Beulich
2019-09-13 9:18 ` Jan Beulich
2019-09-12 7:22 ` [Xen-devel] [PATCH v10 15/16] microcode: disable late loading if CPUs are affected by BDF90 Chao Gao
2019-09-13 9:22 ` Jan Beulich
2019-09-17 9:01 ` Chao Gao
2019-09-17 10:49 ` Jan Beulich
2019-09-13 12:23 ` Andrew Cooper [this message]
2019-09-12 7:22 ` [Xen-devel] [PATCH v10 16/16] microcode/intel: writeback and invalidate cache conditionally Chao Gao
2019-09-13 9:32 ` Jan Beulich
2019-09-13 8:47 ` [Xen-devel] [PATCH v10 00/16] improve late microcode loading Jan Beulich
2019-09-17 7:09 ` Chao Gao
2019-09-17 7:11 ` Jan Beulich
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