@@ -239,6 +239,7 @@ static void pci_testdev_realize(PCIDevice *pci_dev, Error **errp)
uint8_t *pci_conf;
char *name;
int r, i;
+ bool fastmmio = kvm_ioeventfd_any_length_enabled();
pci_conf = pci_dev->config;
@@ -261,8 +262,12 @@ static void pci_testdev_realize(PCIDevice *pci_dev, Error **errp)
memcpy(test->hdr->name, name, strlen(name) + 1);
g_free(name);
test->hdr->offset = cpu_to_le32(IOTEST_SIZE(i) + i * IOTEST_ACCESS_WIDTH);
- test->size = IOTEST_ACCESS_WIDTH;
test->match_data = strcmp(IOTEST_TEST(i), "wildcard-eventfd");
+ if (fastmmio && IOTEST_IS_MEM(i) && !test->match_data) {
+ test->size = 0;
+ } else {
+ test->size = IOTEST_ACCESS_WIDTH;
+ }
test->hdr->test = i;
test->hdr->data = test->match_data ? IOTEST_DATAMATCH : IOTEST_NOMATCH;
test->hdr->width = IOTEST_ACCESS_WIDTH;
Teach PCI testdev to use fast MMIO when kvm makes it available. Before: mmio-wildcard-eventfd:pci-mem 2271 After: mmio-wildcard-eventfd:pci-mem 1218 Signed-off-by: Michael S. Tsirkin <mst@redhat.com> --- hw/misc/pci-testdev.c | 7 ++++++- 1 file changed, 6 insertions(+), 1 deletion(-)