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[Qemu-devel] [PATCH] pci-testdev: fast mmio support
From: |
Michael S. Tsirkin |
Subject: |
[Qemu-devel] [PATCH] pci-testdev: fast mmio support |
Date: |
Thu, 24 Mar 2016 15:10:52 +0200 |
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 <address@hidden>
---
hw/misc/pci-testdev.c | 7 ++++++-
1 file changed, 6 insertions(+), 1 deletion(-)
diff --git a/hw/misc/pci-testdev.c b/hw/misc/pci-testdev.c
index 5df9089..2f2e989 100644
--- a/hw/misc/pci-testdev.c
+++ b/hw/misc/pci-testdev.c
@@ -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;
--
MST
- [Qemu-devel] [PATCH] pci-testdev: fast mmio support,
Michael S. Tsirkin <=