linux-kernel - Re: [PATCH v8 4/4] KVM: X86: Add flush_on

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Message-ID: <b4514403-a3ee-3d2f-e4c3-a56419fc90f5@redhat.com>
Date:   Wed, 13 Dec 2017 14:32:48 +0100
From:   Paolo Bonzini <pbonzini@...hat.com>
To:     Peter Zijlstra <peterz@...radead.org>,
        Wanpeng Li <kernellwp@...il.com>
Cc:     linux-kernel@...r.kernel.org, kvm@...r.kernel.org,
        Radim Krčmář <rkrcmar@...hat.com>,
        Wanpeng Li <wanpeng.li@...mail.com>
Subject: Re: [PATCH v8 4/4] KVM: X86: Add flush_on_enter before guest enter

On 13/12/2017 13:54, Peter Zijlstra wrote:
>> +	++vcpu->stat.tlb_flush;
>> +	kvm_x86_ops->tlb_flush(vcpu, invalidate_gpa);
> 
> WRT to PTI; how much does this actually invalidate? Does this invalidate
> the _entire_ guest TLB, or only the current guest PCID?

All the PCIDs.

Paolo