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

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20171213125446.bx34qaj3sg6z32xu@hirez.programming.kicks-ass.net>
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?

> +}