linux-kernel - Re: [PATCH 1/2] KVM: x86: fix APIC page invalidation

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Message-ID: <20171201122110.nxn7ulustwn2suqh@nora.maurer-it.com>
Date:   Fri, 1 Dec 2017 13:21:10 +0100
From:   Fabian Grünbichler <f.gruenbichler@...xmox.com>
To:     Radim Krčmář <rkrcmar@...hat.com>
Cc:     linux-kernel@...r.kernel.org, linux-mm@...ck.org,
        kvm@...r.kernel.org, Paolo Bonzini <pbonzini@...hat.com>,
        Andrea Arcangeli <aarcange@...hat.com>,
        Jérôme Glisse <jglisse@...hat.com>
Subject: Re: [PATCH 1/2] KVM: x86: fix APIC page invalidation

On Thu, Nov 30, 2017 at 07:05:45PM +0100, Radim Krčmář wrote:
> Implementation of the unpinned APIC page didn't update the VMCS address
> cache when invalidation was done through range mmu notifiers.
> This became a problem when the page notifier was removed.
> 
> Re-introduce the arch-specific helper and call it from ...range_start.
> 
> Fixes: 38b9917350cb ("kvm: vmx: Implement set_apic_access_page_addr")
> Fixes: 369ea8242c0f ("mm/rmap: update to new mmu_notifier semantic v2")
> Signed-off-by: Radim Krčmář <rkrcmar@...hat.com>

Thanks for the fast reaction!

Some initial test rounds with just Patch 1 applied on top of 4.13.8 show
no blue screens, will do more tests also with 4.14.3 on Monday and
report back.

4.15-rc1 crashes for unrelated reasons, but I can re-run the tests once
a stable-enough rc has been cut..