linux-kernel.vger.kernel.org archive mirror
 help / color / mirror / Atom feed
From: Wanpeng Li <kernellwp@gmail.com>
To: Borislav Petkov <bp@alien8.de>
Cc: LKML <linux-kernel@vger.kernel.org>, kvm <kvm@vger.kernel.org>,
	"Paolo Bonzini" <pbonzini@redhat.com>,
	"Radim Krčmář" <rkrcmar@redhat.com>
Subject: Re: [PATCH] KVM: X86: Allow userspace to define the microcode version
Date: Mon, 26 Feb 2018 19:52:36 +0800	[thread overview]
Message-ID: <CANRm+CwD4GE_tunwAoarq_W_gfomwXQB+ay8YE5KxJCBktDkyw@mail.gmail.com> (raw)
In-Reply-To: <20180226114409.GD4377@pd.tnic>

2018-02-26 19:44 GMT+08:00 Borislav Petkov <bp@alien8.de>:
> On Mon, Feb 26, 2018 at 07:37:32PM +0800, Wanpeng Li wrote:
>> The guest write is ignored as the original kvm implementation before the patch.
>
> That will never work because there's no virtualized microcode loader.
> Which will be a dumb idea anyway.
>
> Goes to show that dealing with microcode revisions for a guest is the
> wrong approach.
>
>> Hmm, the apic_check_deadline_errata() example can be referred to.
>
> So that's basically what I'm saying - fix apic_check_deadline_errata()
> to check whether the kernel runs as a guest.

Both I and the link agree with your opinion. However, it is hard to
fix all the guest images which have already been used by customers in
cloud environment, anyway, this patch supplies an alternative way to
work around by host admin.

Regards,
Wanpeng Li

  reply	other threads:[~2018-02-26 11:52 UTC|newest]

Thread overview: 43+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-02-26  7:23 [PATCH] KVM: X86: Allow userspace to define the microcode version Wanpeng Li
2018-02-26  9:41 ` Borislav Petkov
2018-02-26 10:06   ` Wanpeng Li
2018-02-26 10:49     ` Borislav Petkov
2018-02-26 11:02       ` Wanpeng Li
2018-02-26 11:16         ` Borislav Petkov
2018-02-26 11:25           ` Wanpeng Li
2018-02-26 11:30             ` Borislav Petkov
2018-02-26 11:37               ` Wanpeng Li
2018-02-26 11:44                 ` Borislav Petkov
2018-02-26 11:52                   ` Wanpeng Li [this message]
2018-02-26 11:54                   ` Paolo Bonzini
2018-02-26 12:15                     ` Borislav Petkov
2018-02-26 12:16                       ` Paolo Bonzini
2018-02-26 12:18                         ` Paolo Bonzini
2018-02-26 12:22                           ` Borislav Petkov
2018-02-26 12:41                             ` Paolo Bonzini
2018-02-26 13:05                               ` Borislav Petkov
2018-02-26 14:39                               ` Konrad Rzeszutek Wilk
2018-02-26 14:46                                 ` Paolo Bonzini
2018-02-26 19:37                                 ` Borislav Petkov
2018-02-26 20:51                                   ` Konrad Rzeszutek Wilk
2018-02-26 21:30                                     ` Konrad Rzeszutek Wilk
2018-02-27  8:33                                       ` Paolo Bonzini
2018-03-08  9:24                                       ` [tip:x86/pti] x86/spectre_v2: Don't check microcode versions when running under hypervisors tip-bot for Konrad Rzeszutek Wilk
2018-04-17 10:40                               ` [PATCH] KVM: X86: Allow userspace to define the microcode version Wanpeng Li
2018-04-17 20:24                                 ` Eduardo Habkost
2018-04-18  3:24                                   ` Wanpeng Li
2018-04-18  9:03                                     ` Eduardo Habkost
2018-04-18 10:36                                       ` Paolo Bonzini
2018-04-23 12:58                                         ` Borislav Petkov
2018-04-23 13:08                                           ` Eduardo Habkost
2018-04-23 13:23                                             ` Borislav Petkov
2018-04-23 16:03                                           ` Paolo Bonzini
2018-04-24  2:59                                         ` Wanpeng Li
2018-04-24  3:14                                           ` Konrad Rzeszutek Wilk
2018-04-24  5:09                                             ` Paolo Bonzini
2018-04-24 13:44                                               ` Konrad Rzeszutek Wilk
2018-04-24  2:56                               ` Wanpeng Li
2018-02-26 11:47       ` Paolo Bonzini
2018-02-26 12:20         ` Borislav Petkov
2018-02-26  9:26 Liran Alon
2018-02-26 10:08 ` Wanpeng Li

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=CANRm+CwD4GE_tunwAoarq_W_gfomwXQB+ay8YE5KxJCBktDkyw@mail.gmail.com \
    --to=kernellwp@gmail.com \
    --cc=bp@alien8.de \
    --cc=kvm@vger.kernel.org \
    --cc=linux-kernel@vger.kernel.org \
    --cc=pbonzini@redhat.com \
    --cc=rkrcmar@redhat.com \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line before the message body. 
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).