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[Qemu-devel] [PULL 7/7] vfio: fix mapping of MSIX bar
From: |
Alex Williamson |
Subject: |
[Qemu-devel] [PULL 7/7] vfio: fix mapping of MSIX bar |
Date: |
Fri, 17 Jan 2014 12:25:50 -0700 |
User-agent: |
StGit/0.17-dirty |
From: Alexey Kardashevskiy <address@hidden>
VFIO virtualizes MSIX table for the guest but not mapping the part of
a BAR which contains an MSIX table. Since vfio_mmap_bar() mmaps chunks
before and after the MSIX table, they have to be aligned to the host
page size which may be TARGET_PAGE_MASK (4K) or 64K in case of PPC64.
This fixes boundaries calculations to use the real host page size.
Without the patch, the chunk before MSIX table may overlap with the MSIX
table and mmap will fail in the host kernel. The result will be serious
slowdown as the whole BAR will be emulated by QEMU.
Signed-off-by: Alexey Kardashevskiy <address@hidden>
Signed-off-by: Alex Williamson <address@hidden>
---
hw/misc/vfio.c | 6 +++---
1 file changed, 3 insertions(+), 3 deletions(-)
diff --git a/hw/misc/vfio.c b/hw/misc/vfio.c
index 432547c..8a1f1a1 100644
--- a/hw/misc/vfio.c
+++ b/hw/misc/vfio.c
@@ -2544,7 +2544,7 @@ static void vfio_map_bar(VFIODevice *vdev, int nr)
* potentially insert a direct-mapped subregion before and after it.
*/
if (vdev->msix && vdev->msix->table_bar == nr) {
- size = vdev->msix->table_offset & TARGET_PAGE_MASK;
+ size = vdev->msix->table_offset & qemu_host_page_mask;
}
strncat(name, " mmap", sizeof(name) - strlen(name) - 1);
@@ -2556,8 +2556,8 @@ static void vfio_map_bar(VFIODevice *vdev, int nr)
if (vdev->msix && vdev->msix->table_bar == nr) {
unsigned start;
- start = TARGET_PAGE_ALIGN(vdev->msix->table_offset +
- (vdev->msix->entries * PCI_MSIX_ENTRY_SIZE));
+ start = HOST_PAGE_ALIGN(vdev->msix->table_offset +
+ (vdev->msix->entries * PCI_MSIX_ENTRY_SIZE));
size = start < bar->size ? bar->size - start : 0;
strncat(name, " msix-hi", sizeof(name) - strlen(name) - 1);
- [Qemu-devel] [PULL 0/7] vfio pull request, Alex Williamson, 2014/01/17
- [Qemu-devel] [PULL 1/7] vfio: Destroy memory regions, Alex Williamson, 2014/01/17
- [Qemu-devel] [PULL 2/7] vfio: warn if host device rom can't be read, Alex Williamson, 2014/01/17
- [Qemu-devel] [PULL 3/7] vfio: Do not reattempt a failed rom read, Alex Williamson, 2014/01/17
- [Qemu-devel] [PULL 4/7] vfio: Filter out bogus mappings, Alex Williamson, 2014/01/17
- [Qemu-devel] [PULL 5/7] vfio-pci: Fail initfn on DMA mapping errors, Alex Williamson, 2014/01/17
- [Qemu-devel] [PULL 6/7] kvm: initialize qemu_host_page_size, Alex Williamson, 2014/01/17
- [Qemu-devel] [PULL 7/7] vfio: fix mapping of MSIX bar,
Alex Williamson <=