diff mbox series

[v2,09/24] i386/xen: advertise XEN_HVM_CPUID_UPCALL_VECTOR in CPUID

Message ID 20231019154020.99080-10-dwmw2@infradead.org (mailing list archive)
State New, archived
Headers show
Series Get Xen PV shim running in Qemu, add net & console | expand

Commit Message

David Woodhouse Oct. 19, 2023, 3:40 p.m. UTC 
From: David Woodhouse <dwmw@amazon.co.uk>

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 <dwmw@amazon.co.uk>
---
 target/i386/kvm/kvm.c | 4 ++++
 1 file changed, 4 insertions(+)
diff mbox series

Patch

diff --git a/target/i386/kvm/kvm.c b/target/i386/kvm/kvm.c
index ab72bcdfad..bd774b3e02 100644
--- a/target/i386/kvm/kvm.c
+++ b/target/i386/kvm/kvm.c
@@ -1889,6 +1889,10 @@  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);