diff mbox series

[04/12] i386/xen: advertise XEN_HVM_CPUID_UPCALL_VECTOR in CPUID

Message ID 20231016151909.22133-5-dwmw2@infradead.org (mailing list archive)
State New, archived
Headers show
Series Get Xen PV shim running in qemu | expand

Commit Message

David Woodhouse Oct. 16, 2023, 3:19 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(+)

Comments

Durrant, Paul Oct. 24, 2023, 12:32 p.m. UTC | #1 
On 16/10/2023 16:19, David Woodhouse wrote:
> 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(+)
> 

Reviewed-by: Paul Durrant <paul@xen.org>
diff mbox series

Patch

diff --git a/target/i386/kvm/kvm.c b/target/i386/kvm/kvm.c
index f6c7f7e268..8bdbdcdffe 100644
--- a/target/i386/kvm/kvm.c
+++ b/target/i386/kvm/kvm.c
@@ -1887,6 +1887,10 @@  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);