diff options
Diffstat (limited to 'hw/virtio-pci.c')
| -rw-r--r-- | hw/virtio-pci.c | 28 |
1 files changed, 26 insertions, 2 deletions
diff --git a/hw/virtio-pci.c b/hw/virtio-pci.c index caff0aa2eb..c93889a2ab 100644 --- a/hw/virtio-pci.c +++ b/hw/virtio-pci.c @@ -91,6 +91,9 @@ */ #define wmb() do { } while (0) +/* HACK for virtio to determine if it's running a big endian guest */ +bool virtio_is_big_endian(void); + /* virtio device */ static void virtio_pci_notify(void *opaque, uint16_t vector) @@ -414,20 +417,35 @@ static uint32_t virtio_pci_config_readw(void *opaque, uint32_t addr) { VirtIOPCIProxy *proxy = opaque; uint32_t config = VIRTIO_PCI_CONFIG(&proxy->pci_dev); + uint16_t val; if (addr < config) return virtio_ioport_read(proxy, addr); addr -= config; - return virtio_config_readw(proxy->vdev, addr); + val = virtio_config_readw(proxy->vdev, addr); + if (virtio_is_big_endian()) { + /* + * virtio is odd, ioports are LE but config space is target native + * endian. However, in qemu, all PIO is LE, so we need to re-swap + * on BE targets + */ + val = bswap16(val); + } + return val; } static uint32_t virtio_pci_config_readl(void *opaque, uint32_t addr) { VirtIOPCIProxy *proxy = opaque; uint32_t config = VIRTIO_PCI_CONFIG(&proxy->pci_dev); + uint32_t val; if (addr < config) return virtio_ioport_read(proxy, addr); addr -= config; - return virtio_config_readl(proxy->vdev, addr); + val = virtio_config_readl(proxy->vdev, addr); + if (virtio_is_big_endian()) { + val = bswap32(val); + } + return val; } static void virtio_pci_config_writeb(void *opaque, uint32_t addr, uint32_t val) @@ -451,6 +469,9 @@ static void virtio_pci_config_writew(void *opaque, uint32_t addr, uint32_t val) return; } addr -= config; + if (virtio_is_big_endian()) { + val = bswap16(val); + } virtio_config_writew(proxy->vdev, addr, val); } @@ -463,6 +484,9 @@ static void virtio_pci_config_writel(void *opaque, uint32_t addr, uint32_t val) return; } addr -= config; + if (virtio_is_big_endian()) { + val = bswap32(val); + } virtio_config_writel(proxy->vdev, addr, val); } |