linux-kernel - Re: [PATCH v6 11/13] kvm, x86: update spectre-v1 mitigation

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Message-ID: <376a8a99-db4f-09ec-7c1b-a35ced6209c5@redhat.com>
Date:   Wed, 31 Jan 2018 08:49:16 -0500
From:   Paolo Bonzini <pbonzini@...hat.com>
To:     Thomas Gleixner <tglx@...utronix.de>,
        Dan Williams <dan.j.williams@...el.com>
Cc:     Ingo Molnar <mingo@...nel.org>,
        linux-arch <linux-arch@...r.kernel.org>,
        Kernel Hardening <kernel-hardening@...ts.openwall.com>,
        Andrew Honig <ahonig@...gle.com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Greg KH <gregkh@...uxfoundation.org>,
        Alan Cox <alan@...ux.intel.com>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Jim Mattson <jmattson@...gle.com>
Subject: Re: [PATCH v6 11/13] kvm, x86: update spectre-v1 mitigation

On 31/01/2018 03:07, Thomas Gleixner wrote:
>> Hi Thomas,
>>
>> I notice this one missing from -tip, I suspect because of the
>> collision with the raw 'lfence' that is in current mainline? No
>> worries, I'll send a rebased fixup to Paolo directly once
>> array_idx_nospec() goes upstream.

Fine by me.  Also, now that x86/pti has been rebased, a version that
replaces the lfence with array_idx_nospec() would apply to both tip and
4.14.

Paolo

> It did not apply for that reason and I'm still trying to keep x86/pti as
> clean as it goes to keep GregKHs backporting hell somehow under control.