[dpdk-dev] [PATCH v2] vfio: fix workaround of BAR0 mapping

[Takeshi Yoshimura <t.yoshimura8869@gmail.com>]

The workaround of BAR0 mapping does not work if BAR0 area is smaller
than page size (64KB in ppc). In addition, we no longer need the
workaround in recent Linux because VFIO allows MSIX mapping (*).
This fix is just to skip the workaround if BAR0 is smarller than a page.

(*): "vfio-pci: Allow mapping MSIX BAR",
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/
commit/id=a32295c612c57990d17fb0f41e7134394b2f35f6

Fixes: 90a1633b2347 ("eal/linux: allow to map BARs with MSI-X tables")

Signed-off-by: Takeshi Yoshimura <t.yoshimura8869@gmail.com>
---

Fixed checkpatch warnings

 drivers/bus/pci/linux/pci_vfio.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/bus/pci/linux/pci_vfio.c b/drivers/bus/pci/linux/pci_vfio.c
index aeeaa9ed8..b8f4a11f4 100644
--- a/drivers/bus/pci/linux/pci_vfio.c
+++ b/drivers/bus/pci/linux/pci_vfio.c
@@ -337,7 +337,8 @@ pci_vfio_mmap_bar(int vfio_dev_fd, struct mapped_pci_resource *vfio_res,
 		/* Skip this BAR */
 		return 0;
 
-	if (msix_table->bar_index == bar_index) {
+	if (msix_table->bar_index == bar_index &&
+		bar->size > (uint64_t)PAGE_SIZE) {
 		/*
 		 * VFIO will not let us map the MSI-X table,
 		 * but we can map around it.
-- 
2.17.1