diff options
Diffstat (limited to 'tools/lguest/lguest.c')
| -rw-r--r-- | tools/lguest/lguest.c | 59 |
1 files changed, 57 insertions, 2 deletions
diff --git a/tools/lguest/lguest.c b/tools/lguest/lguest.c index 10a72b8..80dc634 100644 --- a/tools/lguest/lguest.c +++ b/tools/lguest/lguest.c @@ -1211,7 +1211,12 @@ static bool valid_bar_access(struct device *d, && cfg_access->cap.length != 4) return false; - /* Offset must be multiple of length */ + /* + * 4.1.4.7.2: + * + * The driver MUST NOT write a cap.offset which is not a multiple of + * cap.length (ie. all accesses MUST be aligned). + */ if (cfg_access->cap.offset % cfg_access->cap.length != 0) return false; @@ -1342,7 +1347,13 @@ static bool pci_data_iowrite(u16 port, u32 mask, u32 val) return true; } - /* Complain about other writes. */ + /* + * 4.1.4.1: + * + * The driver MUST NOT write into any field of the capability + * structure, with the exception of those with cap_type + * VIRTIO_PCI_CAP_PCI_CFG... + */ return false; } @@ -1789,6 +1800,12 @@ static void emulate_mmio_write(struct device *d, u32 off, u32 val, u32 mask) restore_vq_config(&d->mmio->cfg, vq); goto write_through16; case offsetof(struct virtio_pci_mmio, cfg.queue_size): + /* + * 4.1.4.3.2: + * + * The driver MUST NOT write a value which is not a power of 2 + * to queue_size. + */ if (val & (val-1)) errx(1, "%s: invalid queue size %u\n", d->name, val); if (d->mmio->cfg.queue_enable) @@ -1799,11 +1816,22 @@ static void emulate_mmio_write(struct device *d, u32 off, u32 val, u32 mask) errx(1, "%s: attempt to set MSIX vector to %u", d->name, val); case offsetof(struct virtio_pci_mmio, cfg.queue_enable): + /* + * 4.1.4.3.2: + * + * The driver MUST NOT write a 0 to queue_enable. + */ if (val != 1) errx(1, "%s: setting queue_enable to %u", d->name, val); d->mmio->cfg.queue_enable = val; save_vq_config(&d->mmio->cfg, vq_by_num(d, d->mmio->cfg.queue_select)); + /* + * 4.1.4.3.2: + * + * The driver MUST configure the other virtqueue fields before + * enabling the virtqueue with queue_enable. + */ enable_virtqueue(d, vq_by_num(d, d->mmio->cfg.queue_select)); goto write_through16; case offsetof(struct virtio_pci_mmio, cfg.queue_notify_off): @@ -1814,6 +1842,12 @@ static void emulate_mmio_write(struct device *d, u32 off, u32 val, u32 mask) case offsetof(struct virtio_pci_mmio, cfg.queue_avail_hi): case offsetof(struct virtio_pci_mmio, cfg.queue_used_lo): case offsetof(struct virtio_pci_mmio, cfg.queue_used_hi): + /* + * 4.1.4.3.2: + * + * The driver MUST configure the other virtqueue fields before + * enabling the virtqueue with queue_enable. + */ if (d->mmio->cfg.queue_enable) errx(1, "%s: changing queue on live device", d->name); @@ -1837,9 +1871,23 @@ static void emulate_mmio_write(struct device *d, u32 off, u32 val, u32 mask) } /* Fall through... */ default: + /* + * 4.1.4.3.2: + * + * The driver MUST NOT write to device_feature, num_queues, + * config_generation or queue_notify_off. + */ errx(1, "%s: Unexpected write to offset %u", d->name, off); } + + /* + * 4.1.3.1: + * + * The driver MUST access each field using the “natural” access + * method, i.e. 32-bit accesses for 32-bit fields, 16-bit accesses for + * 16-bit fields and 8-bit accesses for 8-bit fields. + */ write_through32: if (mask != 0xFFFFFFFF) { errx(1, "%s: non-32-bit write to offset %u (%#x)", @@ -1923,6 +1971,13 @@ static u32 emulate_mmio_read(struct device *d, u32 off, u32 mask) goto read_through8; } + /* + * 4.1.3.1: + * + * The driver MUST access each field using the “natural” access + * method, i.e. 32-bit accesses for 32-bit fields, 16-bit accesses for + * 16-bit fields and 8-bit accesses for 8-bit fields. + */ read_through32: if (mask != 0xFFFFFFFF) errx(1, "%s: non-32-bit read to offset %u (%#x)", |
