diff options
| -rw-r--r-- | exec.c | 14 | ||||
| -rw-r--r-- | hw/virtio-pci.c | 28 |
2 files changed, 40 insertions, 2 deletions
diff --git a/exec.c b/exec.c index 7f9f730250..5b9eb9aa19 100644 --- a/exec.c +++ b/exec.c @@ -4390,6 +4390,20 @@ tb_page_addr_t get_page_addr_code(CPUState *env1, target_ulong addr) return qemu_ram_addr_from_host_nofail(p); } +/* + * A helper function for the _utterly broken_ virtio device model to find out if + * it's running on a big endian machine. Don't do this at home kids! + */ +bool virtio_is_big_endian(void); +bool virtio_is_big_endian(void) +{ +#if defined(TARGET_WORDS_BIGENDIAN) + return true; +#else + return false; +#endif +} + #define MMUSUFFIX _cmmu #undef GETPC #define GETPC() NULL 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); } |