[v4,04/17] i386/xen: advertise XEN_HVM_CPUID_UPCALL_VECTOR in CPUID

Commit Message

David Woodhouse Nov. 6, 2023, 2:34 p.m. UTC

From: David Woodhouse <[e-mail]>

This will allow Linux guests (since v6.0) to use the per-vCPU upcall
vector delivered as MSI through the local APIC.

Signed-off-by: David Woodhouse <[e-mail]>
Reviewed-by: Paul Durrant <[e-mail]>
---
 target/i386/kvm/kvm.c | 4 ++++
 1 file changed, 4 insertions(+)

Patch

diff --git a/target/i386/kvm/kvm.c b/target/i386/kvm/kvm.c
index 770e81d56e..11b8177eff 100644
--- a/target/i386/kvm/kvm.c
+++ b/target/i386/kvm/kvm.c
@@ -1837,6 +1837,10 @@  int kvm_arch_init_vcpu(CPUState *cs)
                 c->eax |= XEN_HVM_CPUID_VCPU_ID_PRESENT;
                 c->ebx = cs->cpu_index;
             }
+
+            if (cs->kvm_state->xen_version >= XEN_VERSION(4, 17)) {
+                c->eax |= XEN_HVM_CPUID_UPCALL_VECTOR;
+            }
         }
 
         r = kvm_xen_init_vcpu(cs);