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From: Vitaly Kuznetsov <vkuznets@redhat.com>
To: Andy Lutomirski <luto@kernel.org>, Nadav Amit <namit@vmware.com>
Cc: Dave Hansen <dave.hansen@intel.com>,
	Peter Zijlstra <peterz@infradead.org>,
	LKML <linux-kernel@vger.kernel.org>,
	Ingo Molnar <mingo@redhat.com>, Borislav Petkov <bp@alien8.de>,
	the arch/x86 maintainers <x86@kernel.org>,
	Thomas Gleixner <tglx@linutronix.de>,
	Dave Hansen <dave.hansen@linux.intel.com>,
	Paolo Bonzini <pbonzini@redhat.com>,
	"kvm\@vger.kernel.org" <kvm@vger.kernel.org>
Subject: Re: [PATCH 6/9] KVM: x86: Provide paravirtualized flush_tlb_multi()
Date: Wed, 26 Jun 2019 19:41:29 +0200
Message-ID: <878stockhi.fsf@vitty.brq.redhat.com> (raw)
In-Reply-To: <CALCETrW2kudQ-nt7KFKRizNjBAzDVfLW7qQRJmkuigSmsYBFhg@mail.gmail.com>

Andy Lutomirski <luto@kernel.org> writes:

> All this being said, do we currently have any system that supports
> PCID *and* remote flushes?  I guess KVM has some mechanism, but I'm
> not that familiar with its exact capabilities.  If I remember right,
> Hyper-V doesn't expose PCID yet.
>

It already does (and support it to certain extent), see

commit 617ab45c9a8900e64a78b43696c02598b8cad68b
Author: Vitaly Kuznetsov <vkuznets@redhat.com>
Date:   Wed Jan 24 11:36:29 2018 +0100

    x86/hyperv: Stop suppressing X86_FEATURE_PCID

-- 
Vitaly

  reply index

Thread overview: 18+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
     [not found] <20190613064813.8102-1-namit@vmware.com>
2019-06-13  6:48 ` [PATCH 4/9] x86/mm/tlb: Flush remote and local TLBs concurrently Nadav Amit
2019-06-25 21:29   ` Dave Hansen
2019-06-26  2:35     ` Nadav Amit
2019-06-26  3:00       ` Dave Hansen
2019-06-26  3:32         ` Nadav Amit
2019-06-26  3:36   ` Andy Lutomirski
2019-06-26  3:48     ` Nadav Amit
2019-06-26  3:51       ` Andy Lutomirski
2019-06-13  6:48 ` [PATCH 6/9] KVM: x86: Provide paravirtualized flush_tlb_multi() Nadav Amit
2019-06-25 21:40   ` Dave Hansen
2019-06-26  2:39     ` Nadav Amit
2019-06-26  3:35       ` Andy Lutomirski
2019-06-26  3:41         ` Nadav Amit
2019-06-26  3:56           ` Andy Lutomirski
2019-06-26  6:30             ` Nadav Amit
2019-06-26 16:37               ` Andy Lutomirski
2019-06-26 17:41                 ` Vitaly Kuznetsov [this message]
2019-06-26 18:21                   ` Andy Lutomirski

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