On 17/02/2024 11:27, David Woodhouse wrote:
From: David Woodhouse <dwmw@xxxxxxxxxxxx>
The kvm_xen_inject_vcpu_vector() function has a comment saying "the fast
version will always work for physical unicast", justifying its use of
kvm_irq_delivery_to_apic_fast() and the WARN_ON_ONCE() when that fails.
In fact that assumption isn't true if X2APIC isn't in use by the guest
and there is (8-bit x)APIC ID aliasing. A single "unicast" destination
APIC ID *may* then be delivered to multiple vCPUs. Remove the warning,
and in fact it might as well just call kvm_irq_delivery_to_apic().
Reported-by: Michal Luczaj <mhal@xxxxxxx>
Fixes: fde0451be8fb3 ("KVM: x86/xen: Support per-vCPU event channel upcall via local APIC")
Signed-off-by: David Woodhouse <dwmw@xxxxxxxxxxxx>
---
arch/x86/kvm/xen.c | 6 ++----
1 file changed, 2 insertions(+), 4 deletions(-)
Reviewed-by: Paul Durrant <paul@xxxxxxx>
