linux-kernel - Re: [PATCH v3] KVM: x86: Use fast path for Xen timer delivery

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Date: Tue, 06 Feb 2024 20:36:12 -0800
From: David Woodhouse <dwmw2@...radead.org>
To: Sean Christopherson <seanjc@...gle.com>
Cc: kvm <kvm@...r.kernel.org>, Paul Durrant <paul@....org>, Paolo Bonzini
 <pbonzini@...hat.com>, 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
Subject: Re: [PATCH v3] KVM: x86: Use fast path for Xen timer delivery

On Tue, 2024-02-06 at 20:28 -0800, Sean Christopherson wrote:
> 
> I agree that's the long term solution, but I am not entirely confident that a big
> overhaul is 6.9 material at this point.  Squeezing an overhaul into 6.8 (and if
> we're being nitpicky, backporting to 6.7) is out of the question.

It actually ends up being really simple. We just lift ->refresh_lock up
and use it to protect all the activate/deactivate/refresh paths.

I have a patch in my tree; just need to put it through some testing.

(Currently stuck in a hotel room with a bunch of positive COVID tests,
unstable wifi and no decent screen, getting a bit fractious :)

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