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[Qemu-devel] [RFC PATCH v2 8/9] vfio/pci: Fixup PCI option ROMs
From: |
Alex Williamson |
Subject: |
[Qemu-devel] [RFC PATCH v2 8/9] vfio/pci: Fixup PCI option ROMs |
Date: |
Fri, 12 Feb 2016 17:17:18 -0700 |
User-agent: |
StGit/0.17.1-dirty |
Devices like Intel graphics are known to not only have bad checksums,
but also the wrong device ID. This is not so surprising given that
the video BIOS is typically part of the system firmware image rather
that embedded into the device and needs to support any IGD device
installed into the system.
Signed-off-by: Alex Williamson <address@hidden>
---
hw/vfio/pci.c | 30 ++++++++++++++++++++++++++++++
1 file changed, 30 insertions(+)
diff --git a/hw/vfio/pci.c b/hw/vfio/pci.c
index 4c376a8..07af5ca 100644
--- a/hw/vfio/pci.c
+++ b/hw/vfio/pci.c
@@ -832,6 +832,36 @@ static void vfio_pci_load_rom(VFIOPCIDevice *vdev)
break;
}
}
+
+ /*
+ * Test the ROM signature against our device, if the vendor is correct
+ * but the device ID doesn't match, store the correct device ID and
+ * recompute the checksum. Intel IGD devices need this and are known
+ * to have bogus checksums so we can't simply adjust the checksum.
+ */
+ if (pci_get_word(vdev->rom) == 0xaa55 &&
+ pci_get_word(vdev->rom + 0x18) + 8 < vdev->rom_size &&
+ !memcmp(vdev->rom + pci_get_word(vdev->rom + 0x18), "PCIR", 4)) {
+ uint16_t vid, did;
+
+ vid = pci_get_word(vdev->rom + pci_get_word(vdev->rom + 0x18) + 4);
+ did = pci_get_word(vdev->rom + pci_get_word(vdev->rom + 0x18) + 6);
+
+ if (vid == vdev->vendor_id && did != vdev->device_id) {
+ int i;
+ uint8_t csum, *data = vdev->rom;
+
+ pci_set_word(vdev->rom + pci_get_word(vdev->rom + 0x18) + 6,
+ vdev->device_id);
+ data[6] = 0;
+
+ for (csum = 0, i = 0; i < vdev->rom_size; i++) {
+ csum += data[i];
+ }
+
+ data[6] = -csum;
+ }
+ }
}
static uint64_t vfio_rom_read(void *opaque, hwaddr addr, unsigned size)
- [Qemu-devel] [RFC PATCH v2 0/9] vfio: capability chains, sparse mmap, device specific regions, IGD support, Alex Williamson, 2016/02/12
- [Qemu-devel] [RFC PATCH v2 1/9] vfio: Add sysfsdev property for pci & platform, Alex Williamson, 2016/02/12
- [Qemu-devel] [RFC PATCH v2 2/9] vfio: Wrap VFIO_DEVICE_GET_REGION_INFO, Alex Williamson, 2016/02/12
- [Qemu-devel] [RFC PATCH v2 3/9] vfio: Generalize region support, Alex Williamson, 2016/02/12
- [Qemu-devel] [RFC PATCH v2 4/9] vfio/pci: Convert all MemoryRegion to dynamic alloc and consistent functions, Alex Williamson, 2016/02/12
- [Qemu-devel] [RFC PATCH v2 5/9] linux-headers/vfio: Update for proposed capabilities list, Alex Williamson, 2016/02/12
- [Qemu-devel] [RFC PATCH v2 6/9] vfio: Enable sparse mmap capability, Alex Williamson, 2016/02/12
- [Qemu-devel] [RFC PATCH v2 7/9] vfio/pci: Intel IGD graphics support, Alex Williamson, 2016/02/12
- [Qemu-devel] [RFC PATCH v2 8/9] vfio/pci: Fixup PCI option ROMs,
Alex Williamson <=
- [Qemu-devel] [RFC PATCH v2 9/9] vfio/pci: Intel IGD stolen memory quirk, Alex Williamson, 2016/02/12