linux-kernel - Re: [PATCH v3 2/2] KVM: x86/xen: Stop Xen timer before changing IRQ

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Date:   Tue, 09 Aug 2022 15:52:46 +0100
From:   David Woodhouse <dwmw2@...radead.org>
To:     Sean Christopherson <seanjc@...gle.com>,
        Paolo Bonzini <pbonzini@...hat.com>
Cc:     Coleman Dietsch <dietschc@....edu>, kvm@...r.kernel.org,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        Dave Hansen <dave.hansen@...ux.intel.com>, x86@...nel.org,
        "H . Peter Anvin" <hpa@...or.com>, linux-kernel@...r.kernel.org,
        skhan@...uxfoundation.org, Pavel Skripkin <paskripkin@...il.com>,
        linux-kernel-mentees@...ts.linuxfoundation.org,
        stable@...r.kernel.org,
        syzbot+e54f930ed78eb0f85281@...kaller.appspotmail.com,
        metikaya <metikaya@...zon.co.uk>
Subject: Re: [PATCH v3 2/2] KVM: x86/xen: Stop Xen timer before changing IRQ

On Tue, 2022-08-09 at 14:40 +0000, Sean Christopherson wrote:
> I wanted to separate the "init" from the "stop+start", e.g. if there were a more
> appropriate place for invoking kvm_xen_init_timer() I would have suggested moving
> the call outside of KVM_XEN_VCPU_ATTR_TYPE_TIMER entirely.

Yeah, there's nowhere sensible that would apply to only Xen guests. I
looked at kvm_xen_init_vcpu() but that's unconditional.

I do note that we're now calling kvm_xen_init_timer() even when an
*unset* timer is being restored after live update/live migration. But I
think that's OK.

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