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File _service:tar_scm:vfio-pci-Ascend310-need-4Bytes-quirk-in-bar4.patch of Package qemu
From 9558ea5d0bded6c9189adf2ce317cca205604c15 Mon Sep 17 00:00:00 2001 From: Binfeng Wu <wubinfeng@huawei.com> Date: Tue, 8 Feb 2022 17:00:39 +0800 Subject: [PATCH] vfio/pci: Ascend310 need 4Bytes quirk in bar4 --- hw/vfio/pci-quirks.c | 75 ++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 75 insertions(+) diff --git a/hw/vfio/pci-quirks.c b/hw/vfio/pci-quirks.c index 84b1a7b948..8fb190ce3c 100644 --- a/hw/vfio/pci-quirks.c +++ b/hw/vfio/pci-quirks.c @@ -1209,6 +1209,80 @@ int vfio_pci_igd_opregion_init(VFIOPCIDevice *vdev, return 0; } +#define PCI_VENDOR_ID_HUAWEI 0x19e5 +#define PCI_DEVICE_ID_ASCEND310 0xd100 +#define ASCEND310_XLOADER_SIZE 4 +#define ASCEND310_XLOADER_OFFSET 0x400 + +typedef struct VFIOAscendBarQuirk { + struct VFIOPCIDevice *vdev; + pcibus_t offset; + uint8_t bar; + MemoryRegion *mem; +} VFIOAscendBarQuirk; + +static uint64_t vfio_ascend_quirk_read(void *opaque, + hwaddr addr, unsigned size) +{ + VFIOAscendBarQuirk *quirk = opaque; + VFIOPCIDevice *vdev = quirk->vdev; + + qemu_log("read RO region! addr=0x%" HWADDR_PRIx ", size=%d\n", + addr + quirk->offset, size); + + return vfio_region_read(&vdev->bars[quirk->bar].region, + addr + quirk->offset, size); +} + +static void vfio_ascend_quirk_write(void *opaque, hwaddr addr, + uint64_t data, unsigned size) +{ + VFIOAscendBarQuirk *quirk = opaque; + + qemu_log("modifying RO region is not allowed! addr=0x%" + HWADDR_PRIx ", data=0x%" PRIx64 ", size=%d\n", + addr + quirk->offset, data, size); +} + +static const MemoryRegionOps vfio_ascend_intercept_regs_quirk = { + .read = vfio_ascend_quirk_read, + .write = vfio_ascend_quirk_write, + .endianness = DEVICE_LITTLE_ENDIAN, +}; + +static void vfio_probe_ascend310_bar4_quirk(VFIOPCIDevice *vdev, int nr) +{ + VFIOQuirk *quirk; + VFIOAscendBarQuirk *bar4_quirk; + + if (vdev->vendor_id != PCI_VENDOR_ID_HUAWEI || nr != 4 || + vdev->device_id != PCI_DEVICE_ID_ASCEND310) { + return; + } + + quirk = g_malloc0(sizeof(*quirk)); + quirk->nr_mem = 1; + quirk->mem = g_new0(MemoryRegion, quirk->nr_mem); + bar4_quirk = quirk->data = g_new0(typeof(*bar4_quirk), quirk->nr_mem); + bar4_quirk[0].vdev = vdev; + bar4_quirk[0].offset = ASCEND310_XLOADER_OFFSET; + bar4_quirk[0].bar = nr; + + /* + * intercept w/r to the xloader-updating register, + * so the vm can't enable xloader-updating + */ + memory_region_init_io(&quirk->mem[0], OBJECT(vdev), + &vfio_ascend_intercept_regs_quirk, + &bar4_quirk[0], + "vfio-ascend310-bar4-intercept-regs-quirk", + ASCEND310_XLOADER_SIZE); + memory_region_add_subregion_overlap(vdev->bars[nr].region.mem, + bar4_quirk[0].offset, + &quirk->mem[0], 1); + QLIST_INSERT_HEAD(&vdev->bars[nr].quirks, quirk, next); +} + /* * Common quirk probe entry points. */ @@ -1261,6 +1335,7 @@ void vfio_bar_quirk_setup(VFIOPCIDevice *vdev, int nr) #ifdef CONFIG_VFIO_IGD vfio_probe_igd_bar4_quirk(vdev, nr); #endif + vfio_probe_ascend310_bar4_quirk(vdev, nr); } void vfio_bar_quirk_exit(VFIOPCIDevice *vdev, int nr) -- 2.27.0
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