linux-kernel - Re: [PATCH v2 -next] kvm_host: Remove unused declarations

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Date:   Thu, 17 Aug 2023 17:08:38 -0700
From:   Sean Christopherson <seanjc@...gle.com>
To:     Sean Christopherson <seanjc@...gle.com>, pbonzini@...hat.com,
        Yue Haibing <yuehaibing@...wei.com>
Cc:     kvm@...r.kernel.org, linux-kernel@...r.kernel.org,
        nitesh@...hat.com, scottwood@...escale.com
Subject: Re: [PATCH v2 -next] kvm_host: Remove unused declarations

On Mon, 14 Aug 2023 22:03:39 +0800, Yue Haibing wrote:
> Commit 07f0a7bdec5c ("kvm: destroy emulated devices on VM exit") removed the
> functions but not these declarations.
> Commit 7ee30bc132c6 ("KVM: x86: deliver KVM IOAPIC scan request to target vCPUs")
> declared but never implemented kvm_make_cpus_request_mask()
> 
> 

Applied to kvm-x86 generic, though I split it into two patches.  The removal
of kvm_make_cpus_request_mask() is surprisingly interesting, and likely related
to the spurious declaration.  The exclusive/all versions use "cpus", whereas
the inclusive mask helper uses "vcpus".  I'm guessing the spurious declaration
came in because the original author tried to match the exclusive/all versions.

IMO, "vcpus" is obviously better terminology, e.g. differentiates from
kvm_kick_many_cpus(), which targets physical CPUs.  I think we should rename
kvm_make_all_cpus_request() and kvm_make_all_cpus_request_except() to use
"vcpus", but that's a much larger patch (trivial, but large).  I'll send that
cleanup for the 6.7 cycle.

Thanks!

[1/2] KVM: Remove unused kvm_device_{get,put}() declarations
      https://github.com/kvm-x86/linux/commit/1f8403953f05
[2/2] KVM: Remove unused kvm_make_cpus_request_mask() declaration
      https://github.com/kvm-x86/linux/commit/458933d33af2

--
https://github.com/kvm-x86/linux/tree/next
https://github.com/kvm-x86/linux/tree/fixes