[Xen-devel] [PATCH v2 10/11] pvh: Send an SCI on VCPU hotplug event

[Boris Ostrovsky <boris.ostrovsky@xxxxxxxxxx>]

.. and update GPE0 registers.

Signed-off-by: Boris Ostrovsky <boris.ostrovsky@xxxxxxxxxx>
---
Changes in v2:
* Use has_ioreq_cpuhp() instead of ioreq_gmfn.mask==0 as check 
  for PVH guest


 xen/arch/x86/domctl.c | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/xen/arch/x86/domctl.c b/xen/arch/x86/domctl.c
index b736d4c..07c8247 100644
--- a/xen/arch/x86/domctl.c
+++ b/xen/arch/x86/domctl.c
@@ -1443,6 +1443,18 @@ long arch_do_domctl(
             break;
 
         d->arch.avail_vcpus = num;
+
+        /*
+         * For PVH guests we need to send an SCI and set enable/status
+         * bits in GPE block (DSDT specifies _E02, so it's bit 2).
+         */
+        if ( is_hvm_domain(d) && !has_ioreq_cpuhp(d) )
+        {
+            d->arch.hvm_domain.acpi_io.gpe[2] =
+                d->arch.hvm_domain.acpi_io.gpe[0] = 4;
+            send_guest_vcpu_virq(d->vcpu[0], VIRQ_SCI);
+        }
+
         ret = 0;
         break;
     }
-- 
2.7.4


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