pci: make each capability DWORD aligned

PCI spec (see e.g. 6.7 Capabilities List in spec rev 3.0)
requires that each capability is DWORD aligned.
Ensure this when allocating space by rounding size up to 4.

Signed-off-by: Michael S. Tsirkin <mst@redhat.com>

1 files changed, 2 insertions, 2 deletions

diff --git a/hw/pci.c b/hw/pci.c
index 70b5fd965b..35cb374845 100644
--- a/hw/pci.c
+++ b/hw/pci.c
@@ -1906,7 +1906,7 @@ int pci_add_capability(PCIDevice *pdev, uint8_t cap_id,
     config[PCI_CAP_LIST_NEXT] = pdev->config[PCI_CAPABILITY_LIST];
     pdev->config[PCI_CAPABILITY_LIST] = offset;
     pdev->config[PCI_STATUS] |= PCI_STATUS_CAP_LIST;
-    memset(pdev->used + offset, 0xFF, size);
+    memset(pdev->used + offset, 0xFF, QEMU_ALIGN_UP(size, 4));
     /* Make capability read-only by default */
     memset(pdev->wmask + offset, 0, size);
     /* Check capability by default */
@@ -1926,7 +1926,7 @@ void pci_del_capability(PCIDevice *pdev, uint8_t cap_id, uint8_t size)
     memset(pdev->w1cmask + offset, 0, size);
     /* Clear cmask as device-specific registers can't be checked */
     memset(pdev->cmask + offset, 0, size);
-    memset(pdev->used + offset, 0, size);
+    memset(pdev->used + offset, 0, QEMU_ALIGN_UP(size, 4));
 
     if (!pdev->config[PCI_CAPABILITY_LIST])
         pdev->config[PCI_STATUS] &= ~PCI_STATUS_CAP_LIST;