Commit 45aa4e8e authored by Michael S. Tsirkin's avatar Michael S. Tsirkin
Browse files

pci-testdev: fast mmio support 



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: default avatarMichael S. Tsirkin <mst@redhat.com>
parent 8d0ac88e

hw/misc/pci-testdev.c

+6 −1
Original line number Diff line number Diff line
@@ -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;