[PATCH v2 8/9] qemu-kvm: Refresh MSI settings after vmload

[Jan Kiszka <jan.kiszka@xxxxxxxxxxx>]

Establish a post-load notification for the MSI subsystem so that KVM can
refresh its IRQ routing after vmload.

Signed-off-by: Jan Kiszka <jan.kiszka@xxxxxxxxxxx>
---
 hw/msi.c |   13 +++++++++++++
 hw/msi.h |    1 +
 hw/pci.c |    2 ++
 3 files changed, 16 insertions(+), 0 deletions(-)

diff --git a/hw/msi.c b/hw/msi.c
index 18f683b..0cbff17 100644
--- a/hw/msi.c
+++ b/hw/msi.c
@@ -453,3 +453,16 @@ unsigned int msi_nr_vectors_allocated(const PCIDevice *dev)
     uint16_t flags = pci_get_word(dev->config + msi_flags_off(dev));
     return msi_nr_vectors(flags);
 }
+
+void msi_post_load(PCIDevice *dev)
+{
+    uint16_t flags = pci_get_word(dev->config + msi_flags_off(dev));
+
+    if (kvm_enabled() && kvm_irqchip_in_kernel()) {
+        kvm_msi_free(dev);
+
+        if (flags & PCI_MSI_FLAGS_ENABLE) {
+            kvm_msi_update(dev);
+        }
+    }
+}
diff --git a/hw/msi.h b/hw/msi.h
index 5766018..6ff0607 100644
--- a/hw/msi.h
+++ b/hw/msi.h
@@ -32,6 +32,7 @@ void msi_reset(PCIDevice *dev);
 void msi_notify(PCIDevice *dev, unsigned int vector);
 void msi_write_config(PCIDevice *dev, uint32_t addr, uint32_t val, int len);
 unsigned int msi_nr_vectors_allocated(const PCIDevice *dev);
+void msi_post_load(PCIDevice *dev);
 
 static inline bool msi_present(const PCIDevice *dev)
 {
diff --git a/hw/pci.c b/hw/pci.c
index 82e0300..07ec4f9 100644
--- a/hw/pci.c
+++ b/hw/pci.c
@@ -34,6 +34,7 @@
 #include "device-assignment.h"
 #include "qemu-objects.h"
 #include "range.h"
+#include "msi.h"
 
 //#define DEBUG_PCI
 #ifdef DEBUG_PCI
@@ -342,6 +343,7 @@ static int get_pci_config_device(QEMUFile *f, void *pv, size_t size)
     memcpy(s->config, config, size);
 
     pci_update_mappings(s);
+    msi_post_load(s);
 
     qemu_free(config);
     return 0;
-- 
1.7.1

--
To unsubscribe from this list: send the line "unsubscribe kvm" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html