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

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Date:   Wed, 13 Dec 2017 13:54:46 +0100
From:   Peter Zijlstra <peterz@...radead.org>
To:     Wanpeng Li <kernellwp@...il.com>
Cc:     linux-kernel@...r.kernel.org, kvm@...r.kernel.org,
        Paolo Bonzini <pbonzini@...hat.com>,
        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 Tue, Dec 12, 2017 at 05:33:04PM -0800, Wanpeng Li wrote:
> +static void kvm_vcpu_flush_tlb(struct kvm_vcpu *vcpu, bool invalidate_gpa)
> +{
> +	++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?

> +}