linux-kernel - Re: [PATCH] KVM: PPC: Book3S HV P9: Use kvm_arch_vcpu_get

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Message-Id: <163952881459.928111.11067384310708851429.b4-ty@ellerman.id.au>
Date:   Wed, 15 Dec 2021 11:40:14 +1100
From:   Michael Ellerman <patch-notifications@...erman.id.au>
To:     Sean Christopherson <seanjc@...gle.com>,
        Michael Ellerman <mpe@...erman.id.au>
Cc:     Paolo Bonzini <pbonzini@...hat.com>,
        Sachin Sant <sachinp@...ux.vnet.ibm.com>,
        linuxppc-dev@...ts.ozlabs.org, linux-kernel@...r.kernel.org,
        Nicholas Piggin <npiggin@...il.com>
Subject: Re: [PATCH] KVM: PPC: Book3S HV P9: Use kvm_arch_vcpu_get_wait() to get rcuwait object

On Mon, 13 Dec 2021 17:45:56 +0000, Sean Christopherson wrote:
> Use kvm_arch_vcpu_get_wait() to get a vCPU's rcuwait object instead of
> using vcpu->wait directly in kvmhv_run_single_vcpu().  Functionally, this
> is a nop as vcpu->arch.waitp is guaranteed to point at vcpu->wait.  But
> that is not obvious at first glance, and a future change coming in via
> the KVM tree, commit 510958e99721 ("KVM: Force PPC to define its own
> rcuwait object"), will hide vcpu->wait from architectures that define
> __KVM_HAVE_ARCH_WQP to prevent generic KVM from attepting to wake a vCPU
> with the wrong rcuwait object.
> 
> [...]

Applied to powerpc/next.

[1/1] KVM: PPC: Book3S HV P9: Use kvm_arch_vcpu_get_wait() to get rcuwait object
      https://git.kernel.org/powerpc/c/63fa47ba886b86cbd58f03b3b01b04bd57a1f233

cheers