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authorAlexey Kardashevskiy <aik@ozlabs.ru>2014-06-30 09:52:58 -0600
committerAlex Williamson <alex.williamson@redhat.com>2014-06-30 09:52:58 -0600
commitc40708176a6b52b73bec14796b7c71b882ceb102 (patch)
tree120bd91067292119d4dabd620709a31c3092647d /hw/misc
parentf4d45d47826377722700894dbf7f47444527a9d2 (diff)
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vfio: Make BARs native endian
Slow BAR access path is used when VFIO fails to mmap() BAR. Since this is just a transport between the guest and a device, there is no need to do endianness swapping. This changes BARs to use native endianness. Since non-ROM BARs were doing byte swapping, we need to remove it so does the patch. As the result, this eliminates cancelling byte swaps and there is no change in behavior for non-ROM BARs. ROM BARs were declared little endian too but byte swapping was not implemented for them so they never actually worked on big endian systems as there was no cancelling byte swap. This fixes endiannes for ROM BARs by declaring them native endian and only fixing access sizes as it is done for non-ROM BARs. Signed-off-by: Alexey Kardashevskiy <aik@ozlabs.ru> Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
Diffstat (limited to 'hw/misc')
-rw-r--r--hw/misc/vfio.c41
1 files changed, 31 insertions, 10 deletions
diff --git a/hw/misc/vfio.c b/hw/misc/vfio.c
index 7312ce2..d32678e 100644
--- a/hw/misc/vfio.c
+++ b/hw/misc/vfio.c
@@ -1082,10 +1082,10 @@ static void vfio_bar_write(void *opaque, hwaddr addr,
buf.byte = data;
break;
case 2:
- buf.word = cpu_to_le16(data);
+ buf.word = data;
break;
case 4:
- buf.dword = cpu_to_le32(data);
+ buf.dword = data;
break;
default:
hw_error("vfio: unsupported write size, %d bytes", size);
@@ -1142,10 +1142,10 @@ static uint64_t vfio_bar_read(void *opaque,
data = buf.byte;
break;
case 2:
- data = le16_to_cpu(buf.word);
+ data = buf.word;
break;
case 4:
- data = le32_to_cpu(buf.dword);
+ data = buf.dword;
break;
default:
hw_error("vfio: unsupported read size, %d bytes", size);
@@ -1172,7 +1172,7 @@ static uint64_t vfio_bar_read(void *opaque,
static const MemoryRegionOps vfio_bar_ops = {
.read = vfio_bar_read,
.write = vfio_bar_write,
- .endianness = DEVICE_LITTLE_ENDIAN,
+ .endianness = DEVICE_NATIVE_ENDIAN,
};
static void vfio_pci_load_rom(VFIODevice *vdev)
@@ -1234,21 +1234,42 @@ static void vfio_pci_load_rom(VFIODevice *vdev)
static uint64_t vfio_rom_read(void *opaque, hwaddr addr, unsigned size)
{
VFIODevice *vdev = opaque;
- uint64_t val = ((uint64_t)1 << (size * 8)) - 1;
+ union {
+ uint8_t byte;
+ uint16_t word;
+ uint32_t dword;
+ uint64_t qword;
+ } buf;
+ uint64_t data = 0;
/* Load the ROM lazily when the guest tries to read it */
if (unlikely(!vdev->rom && !vdev->rom_read_failed)) {
vfio_pci_load_rom(vdev);
}
- memcpy(&val, vdev->rom + addr,
+ memcpy(&buf, vdev->rom + addr,
(addr < vdev->rom_size) ? MIN(size, vdev->rom_size - addr) : 0);
+ switch (size) {
+ case 1:
+ data = buf.byte;
+ break;
+ case 2:
+ data = buf.word;
+ break;
+ case 4:
+ data = buf.dword;
+ break;
+ default:
+ hw_error("vfio: unsupported read size, %d bytes", size);
+ break;
+ }
+
DPRINTF("%s(%04x:%02x:%02x.%x, 0x%"HWADDR_PRIx", 0x%x) = 0x%"PRIx64"\n",
__func__, vdev->host.domain, vdev->host.bus, vdev->host.slot,
- vdev->host.function, addr, size, val);
+ vdev->host.function, addr, size, data);
- return val;
+ return data;
}
static void vfio_rom_write(void *opaque, hwaddr addr,
@@ -1259,7 +1280,7 @@ static void vfio_rom_write(void *opaque, hwaddr addr,
static const MemoryRegionOps vfio_rom_ops = {
.read = vfio_rom_read,
.write = vfio_rom_write,
- .endianness = DEVICE_LITTLE_ENDIAN,
+ .endianness = DEVICE_NATIVE_ENDIAN,
};
static bool vfio_blacklist_opt_rom(VFIODevice *vdev)