[Xen-devel] [PATCH for-4.12] x86/dom0: propagate PVH vlapic EOIs to hardware

[Roger Pau Monne <roger.pau@xxxxxxxxxx>]

Current check for MSI EIO is missing a special case for PVH Dom0,
which doesn't have a hvm_irq_dpci struct but requires EIOs to be
forwarded to the physical lapic for passed-through devices.

Add a short-circuit to allow EOIs from PVH Dom0 to be propagated.

Signed-off-by: Roger Pau Monné <roger.pau@xxxxxxxxxx>
---
Cc: Jan Beulich <jbeulich@xxxxxxxx>
Cc: Juergen Gross <jgross@xxxxxxxx>
---
 xen/drivers/passthrough/io.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/xen/drivers/passthrough/io.c b/xen/drivers/passthrough/io.c
index a6eb8a4336..4290c7c710 100644
--- a/xen/drivers/passthrough/io.c
+++ b/xen/drivers/passthrough/io.c
@@ -869,7 +869,8 @@ static int _hvm_dpci_msi_eoi(struct domain *d,
 
 void hvm_dpci_msi_eoi(struct domain *d, int vector)
 {
-    if ( !iommu_enabled || !hvm_domain_irq(d)->dpci )
+    if ( !iommu_enabled ||
+         (!hvm_domain_irq(d)->dpci && !is_hardware_domain(d)) )
        return;
 
     spin_lock(&d->event_lock);
-- 
2.17.2 (Apple Git-113)


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