Re: [PATCH v4 2/6] KVM: x86/xen: Extract delivery of event to vCPU into a separate helper

[David Woodhouse]

On Tue, 2026-08-11 at 13:49 +0100, David Woodhouse wrote:
> From: Sean Christopherson <seanjc@xxxxxxxxxx>
> 
> Move the marking of an event as pending in the target vCPU's vcpu_info
> into a separate helper, __kvm_xen_set_evtchn_fast(), invoked after the
> shared_info processing is complete and its RCU read-side critical
> section has been exited. This makes both halves easier to read.
> 
> No functional change intended.
> 
> Signed-off-by: Sean Christopherson <seanjc@xxxxxxxxxx>
> [dwmw2: rebased onto the RCU conversion of the GPC locking; the
>  read_trylock() failure path in the original no longer exists. The
>  caller's kvm->srcu section now extends across the helper call, since
>  kvm_gpc_check() on the vcpu_info cache consults the memslot
>  generation and the irqfd path enters holding only irq_srcu; in Sean's
>  series that was covered by a guard(srcu) spanning the whole function,
>  which this series does not carry.]
> Signed-off-by: David Woodhouse <dwmw@xxxxxxxxxxxx>
> Assisted-by: Claude:claude-mythos-5
> ---
>  arch/x86/kvm/xen.c | 155 ++++++++++++++++++++++++++++-----------------
>  1 file changed, 98 insertions(+), 57 deletions(-)

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