linux-kernel - Re: [PATCH v2 0/4] KVM: nVMX: Fix 2nd exec controls override goofs

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Message-ID: <Y5toZtbdxwgCTlFT@google.com>
Date:   Thu, 15 Dec 2022 18:33:10 +0000
From:   Sean Christopherson <seanjc@...gle.com>
To:     Yu Zhang <yu.c.zhang@...ux.intel.com>
Cc:     Paolo Bonzini <pbonzini@...hat.com>, kvm@...r.kernel.org,
        linux-kernel@...r.kernel.org, Aaron Lewis <aaronlewis@...gle.com>
Subject: Re: [PATCH v2 0/4] KVM: nVMX: Fix 2nd exec controls override goofs

On Thu, Dec 15, 2022, Yu Zhang wrote:
> On Thu, Dec 15, 2022 at 12:18:33AM +0000, Sean Christopherson wrote:
> > > 
> > > BTW, we may need another patch to remove the obsolete comments in
> > > nested_vmx_setup_ctls_msrs():
> > 
> > Ouch, indeed.  Want to send a proper patch?  Or provide your SoB and I'll write
> > a changelog?
> > 
> > The comment was added by commit 80154d77c922 ("KVM: VMX: cache secondary exec controls"),
> > but arguably the below is the appropriate Fixes, as it's the commit that fixed the
> > existing cases where KVM didn't enumerate supported-but-conditional controls.
> > 
> > Fixes: 6defc591846d ("KVM: nVMX: include conditional controls in /dev/kvm KVM_GET_MSRS")
> > 
> 
> Thanks a lot, Sean, especially for sharing the commit history.
> 
> And I just sent out a patch to fix it.
> 
> One question is about the process of small cleanup patches like
> this: would it be better off to include the cleanup patches as
> part of a larger submission, or is it OK to be sent seperately?

In this case, it's ok to be sent separately.  There are no code dependencies, and
the changelog can be written to say "this comment is no longer accurate", even if
there is still broken code in KVM.

> Previously I submitted some small patches(e.g. [1] & [2]) but
> have not received any reply. So I am just wondering, maybe those
> patches are too trivial and sometimes time-wasting for the reviewers?

They're definitely not too trivial.  This is just an especially rough time of
year for reviews, e.g. end of year corporate stuff, merge window, holidays, etc.

Part of why I haven't provided reviews is that the patches _aren't_ super trivial,
e.g. I'm on the fence on whether mmu_is_direct() should take @vcpu or @mmu, and if
I vote to have it take @mmu, then that'll conflict with mmu_is_nested().  So I end
up staying silent until I can come back to it with fresh eyes to see if there's a
better alternative, or if I'm just being nitpicky.