diff mbox series

[6/6] spapr_pci: add spapr msi read method

Message ID 20200617053934.122642-7-ppandit@redhat.com
State New
Headers show
Series Add various undefined MMIO r/w functions | expand

Commit Message

Prasad Pandit June 17, 2020, 5:39 a.m. UTC 
From: Prasad J Pandit <pjp@fedoraproject.org>

Add spapr msi mmio read method to avoid NULL pointer dereference
issue.

Reported-by: Lei Sun <slei.casper@gmail.com>
Signed-off-by: Prasad J Pandit <pjp@fedoraproject.org>
---
 hw/ppc/spapr_pci.c | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)
diff mbox series

Patch

diff --git a/hw/ppc/spapr_pci.c b/hw/ppc/spapr_pci.c
index 83f1453096..d4193be205 100644
--- a/hw/ppc/spapr_pci.c
+++ b/hw/ppc/spapr_pci.c
@@ -52,6 +52,7 @@ 
 #include "sysemu/kvm.h"
 #include "sysemu/hostmem.h"
 #include "sysemu/numa.h"
+#include "qemu/log.h"
 
 /* Copied from the kernel arch/powerpc/platforms/pseries/msi.c */
 #define RTAS_QUERY_FN           0
@@ -738,6 +739,12 @@  static PCIINTxRoute spapr_route_intx_pin_to_irq(void *opaque, int pin)
     return route;
 }
 
+static uint64_t spapr_msi_read(void *opaque, hwaddr addr, unsigned size)
+{
+    qemu_log_mask(LOG_UNIMP, "%s not implemented\n", __func__);
+    return 0;
+}
+
 /*
  * MSI/MSIX memory region implementation.
  * The handler handles both MSI and MSIX.
@@ -756,7 +763,7 @@  static void spapr_msi_write(void *opaque, hwaddr addr,
 
 static const MemoryRegionOps spapr_msi_ops = {
     /* There is no .read as the read result is undefined by PCI spec */
-    .read = NULL,
+    .read = spapr_msi_read,
     .write = spapr_msi_write,
     .endianness = DEVICE_LITTLE_ENDIAN
 };