All of lore.kernel.org
 help / color / mirror / Atom feed
From: Peter Zijlstra <peterz@infradead.org>
To: Xiaoyao Li <xiaoyao.li@intel.com>
Cc: Sean Christopherson <sean.j.christopherson@intel.com>,
	Paolo Bonzini <pbonzini@redhat.com>,
	Thomas Gleixner <tglx@linutronix.de>,
	Ingo Molnar <mingo@redhat.com>, Borislav Petkov <bp@alien8.de>,
	Andy Lutomirski <luto@amacapital.net>,
	x86@kernel.org, kvm@vger.kernel.org,
	linux-kernel@vger.kernel.org,
	David Laight <David.Laight@aculab.com>
Subject: Re: [PATCH v2 5/6] kvm: x86: Emulate MSR IA32_CORE_CAPABILITIES
Date: Tue, 4 Feb 2020 10:37:25 +0100	[thread overview]
Message-ID: <20200204093725.GC14879@hirez.programming.kicks-ass.net> (raw)
In-Reply-To: <829bd606-6852-121f-0d95-e9f1d35a3dde@intel.com>

On Tue, Feb 04, 2020 at 05:19:26PM +0800, Xiaoyao Li wrote:

> > > +	case MSR_IA32_CORE_CAPS:
> > > +		if (!msr_info->host_initiated)
> > 
> > Shouldn't @data be checked against kvm_get_core_capabilities()?
> 
> Maybe it's for the case that userspace might have the ability to emulate SLD
> feature? And we usually let userspace set whatever it wants, e.g.,
> ARCH_CAPABILITIES.

If the 'sq_misc.split_lock' event is sufficiently accurate, I suppose
the host could use that to emulate the feature at the cost of one
counter used.

  reply	other threads:[~2020-02-04  9:37 UTC|newest]

Thread overview: 31+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-02-03 15:16 [PATCH v2 0/6] kvm/split_lock: Add feature split lock detection support in kvm Xiaoyao Li
2020-02-03 15:16 ` [PATCH v2 1/6] x86/split_lock: Add and export get_split_lock_detect_state() Xiaoyao Li
2020-02-03 21:45   ` Sean Christopherson
2020-02-03 15:16 ` [PATCH v2 2/6] x86/split_lock: Add and export split_lock_detect_set() Xiaoyao Li
2020-02-03 15:16 ` [PATCH v2 3/6] kvm: x86: Emulate split-lock access as a write Xiaoyao Li
2020-02-03 20:54   ` Sean Christopherson
2020-02-04  2:55     ` Xiaoyao Li
2020-02-11 12:20   ` Paolo Bonzini
2020-02-11 13:22     ` Thomas Gleixner
2020-02-11 13:34       ` Paolo Bonzini
2020-02-11 14:02         ` Xiaoyao Li
2020-02-11 14:34           ` David Laight
2020-02-27  0:11         ` Sean Christopherson
2020-03-12 11:42           ` Xiaoyao Li
2020-03-12 15:00             ` Paolo Bonzini
2020-02-03 15:16 ` [PATCH v2 4/6] kvm: vmx: Extend VMX's #AC handding for split lock in guest Xiaoyao Li
2020-02-03 21:14   ` Sean Christopherson
2020-02-04  6:46     ` Xiaoyao Li
2020-02-10 21:30       ` Sean Christopherson
2020-02-03 15:16 ` [PATCH v2 5/6] kvm: x86: Emulate MSR IA32_CORE_CAPABILITIES Xiaoyao Li
2020-02-03 21:43   ` Sean Christopherson
2020-02-04  9:19     ` Xiaoyao Li
2020-02-04  9:37       ` Peter Zijlstra [this message]
2020-02-11  3:52         ` Andy Lutomirski
2020-02-11 12:38           ` Peter Zijlstra
2020-02-03 15:16 ` [PATCH v2 6/6] x86: vmx: virtualize split lock detection Xiaoyao Li
2020-02-03 15:58   ` Xiaoyao Li
2020-02-03 18:52   ` Andy Lutomirski
2020-02-03 21:42   ` Sean Christopherson
2020-02-04  2:52     ` Xiaoyao Li
2020-02-04  5:35       ` Sean Christopherson

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=20200204093725.GC14879@hirez.programming.kicks-ass.net \
    --to=peterz@infradead.org \
    --cc=David.Laight@aculab.com \
    --cc=bp@alien8.de \
    --cc=kvm@vger.kernel.org \
    --cc=linux-kernel@vger.kernel.org \
    --cc=luto@amacapital.net \
    --cc=mingo@redhat.com \
    --cc=pbonzini@redhat.com \
    --cc=sean.j.christopherson@intel.com \
    --cc=tglx@linutronix.de \
    --cc=x86@kernel.org \
    --cc=xiaoyao.li@intel.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 an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.