KVM: x86/xen: Consolidate checks on Xen vCPU ID for singleshot timer hypercalls

Hoist the checks on the Xen vCPU ID when handling set_singleshot_timer and
stop_singleshot_timer hypercalls out of their individual if-statements,
so that both checks on the ID are in common code.  kvm_xen_hcall_vcpu_op()
is already doubly committed to handling only singleshot timer hypercalls,
and even if that were to change in the future, the function could simply
be renamed and turned into a helper specifically for timer hypercalls.

Opportunistically add a comment to explain why the check exists; the code
looks rather nonsensical without the knowledge that @vcpu_id is a common
param for all per-vCPU hypercalls.

No functional change intended.

Reviewed-by: David Woodhouse <dwmw@amazon.co.uk>
Reviewed-by: Philippe Mathieu-Daudé <philmd@oss.qualcomm.com>
Link: https://patch.msgid.link/20260630225619.511632-6-seanjc@google.com
Signed-off-by: Sean Christopherson <seanjc@google.com>

0 files changed, 0 insertions, 0 deletions