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| author | Bandan Das <bsd@redhat.com> | 2014-01-15 10:11:52 -0700 |
|---|---|---|
| committer | Alex Williamson <alex.williamson@redhat.com> | 2014-01-15 10:11:52 -0700 |
| commit | e638073c569e801ce9def2016a84f955cbbca779 (patch) | |
| tree | 0d02ee6f884d2fac77ce56db8b56f8fa9e6f804a /hw/misc | |
| parent | d20b43dfea1587b561aae17e4fa0f7407779d253 (diff) | |
| download | qemu-e638073c569e801ce9def2016a84f955cbbca779.zip qemu-e638073c569e801ce9def2016a84f955cbbca779.tar.gz qemu-e638073c569e801ce9def2016a84f955cbbca779.tar.bz2 | |
vfio: Do not reattempt a failed rom read
During lazy rom loading, if rom read fails, and the
guest attempts a read again, vfio will again attempt it.
Add a boolean to prevent this. There could be a case where
a failed rom read might succeed the next time because of
a device reset or such, but it's best to exclude unpredictable
behavior
Signed-off-by: Bandan Das <bsd@redhat.com>
Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
Diffstat (limited to 'hw/misc')
| -rw-r--r-- | hw/misc/vfio.c | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/hw/misc/vfio.c b/hw/misc/vfio.c index ef615fc..30b1a78 100644 --- a/hw/misc/vfio.c +++ b/hw/misc/vfio.c @@ -191,6 +191,7 @@ typedef struct VFIODevice { bool has_flr; bool has_pm_reset; bool needs_reset; + bool rom_read_failed; } VFIODevice; typedef struct VFIOGroup { @@ -1125,6 +1126,7 @@ static void vfio_pci_load_rom(VFIODevice *vdev) vdev->rom_offset = reg_info.offset; if (!vdev->rom_size) { + vdev->rom_read_failed = true; error_report("vfio-pci: Cannot read device rom at " "%04x:%02x:%02x.%x\n", vdev->host.domain, vdev->host.bus, vdev->host.slot, @@ -1163,6 +1165,9 @@ static uint64_t vfio_rom_read(void *opaque, hwaddr addr, unsigned size) /* Load the ROM lazily when the guest tries to read it */ if (unlikely(!vdev->rom)) { vfio_pci_load_rom(vdev); + if (unlikely(!vdev->rom && !vdev->rom_read_failed)) { + vfio_pci_load_rom(vdev); + } } memcpy(&val, vdev->rom + addr, @@ -1230,6 +1235,7 @@ static void vfio_pci_size_rom(VFIODevice *vdev) PCI_BASE_ADDRESS_SPACE_MEMORY, &vdev->pdev.rom); vdev->pdev.has_rom = true; + vdev->rom_read_failed = false; } static void vfio_vga_write(void *opaque, hwaddr addr, |