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[PULL 04/15] i386/xen: advertise XEN_HVM_CPUID_UPCALL_VECTOR in CPUID

David Woodhouse posted 15 patches 1 year ago

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Maintainers: Kevin Wolf <kwolf@redhat.com>, Hanna Reitz <hreitz@redhat.com>, Stefano Stabellini <sstabellini@kernel.org>, Anthony Perard <anthony.perard@citrix.com>, Paul Durrant <paul@xen.org>, "Marc-André Lureau" <marcandre.lureau@redhat.com>, Paolo Bonzini <pbonzini@redhat.com>, Richard Henderson <richard.henderson@linaro.org>, Eduardo Habkost <eduardo@habkost.net>, "Michael S. Tsirkin" <mst@redhat.com>, Marcel Apfelbaum <marcel.apfelbaum@gmail.com>, David Woodhouse <dwmw2@infradead.org>, Jason Wang <jasowang@redhat.com>, Marcelo Tosatti <mtosatti@redhat.com>

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[PULL 04/15] i386/xen: advertise XEN_HVM_CPUID_UPCALL_VECTOR in CPUID

Posted by David Woodhouse 1 year ago

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>
Reviewed-by: Paul Durrant <paul@xen.org>
---
 target/i386/kvm/kvm.c | 4 ++++
 1 file changed, 4 insertions(+)

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);
-- 
2.41.0