Alex Williamson wrote:
> On Fri, 2012-06-08 at 18:16 +0200, Andreas Hartmann wrote:
[...]
>> Besides the problem with AMD IOMMU, which requires to unbind a whole
>> group of devices in some cases (PCI passthrough - not PCIe), it's really
>> cool! And it's usable now!
>
> If you're feeling adventurous (and know that this may not make it
> upstream), you can do something like this:
Hmm, even without this patch, it's not necessary to bind all devices to
pci-stub. Just to remember:
-[0000:00]-+-14.0 Advanced Micro Devices [AMD] nee ATI SBx00 SMBus Controller
+-14.1 Advanced Micro Devices [AMD] nee ATI SB7x0/SB8x0/SB9x0 IDE
Controller
+-14.2 Advanced Micro Devices [AMD] nee ATI SBx00 Azalia (Intel
HDA)
+-14.3 Advanced Micro Devices [AMD] nee ATI SB7x0/SB8x0/SB9x0 LPC
host controller
+-14.4-[06]--
\-14.5 Advanced Micro Devices [AMD] nee ATI SB7x0/SB8x0/SB9x0 USB
OHCI2 Controller
Device 06:07.0 should be passed through.
The devices 14.0, 14.3 and 14.4 need not to be bound to pci-stub - the
VM starts (and seems to work fine) anyway. Maybe because there isn't
any driver anyway for these devices?
The USB device seems to be an internal device only - all of my external
USB jacks are working fine.
The only thing I'm missing is the sound device.
> diff --git a/drivers/pci/quirks.c b/drivers/pci/quirks.c
> index ab0dba0..5c26804 100644
> --- a/drivers/pci/quirks.c
> +++ b/drivers/pci/quirks.c
> @@ -3161,11 +3161,22 @@ struct pci_dev *pci_get_dma_source(struct pci_dev
> *dev)
> return pci_dev_get(dev);
> }
>
> +static int pci_func_supports_acs(struct pci_dev *dev, u16 acs_flags)
> +{
> + return 1;
> +}
> +
> static const struct pci_dev_acs_enabled {
> u16 vendor;
> u16 device;
> int (*acs_enabled)(struct pci_dev *dev, u16 acs_flags);
> } pci_dev_acs_enabled[] = {
> + { 0x1002, 0x4385, pci_func_supports_acs },
> + { 0x1002, 0x439c, pci_func_supports_acs },
> + { 0x1002, 0x4383, pci_func_supports_acs },
> + { 0x1002, 0x439d, pci_func_supports_acs },
> + { 0x1002, 0x4384, pci_func_supports_acs },
> + { 0x1002, 0x4399, pci_func_supports_acs },
> { 0 }
> };
What's the risk of this patch? Machine crash? Data loss for an active
file in an application? Complete filesystem damage? The latter would be
worse.
> Hmm, I wonder if we should make a kernel boot parameter that allows
> whitelisting some devices. I think it would have to taint the kernel
> but there's probably sufficient interest for usability vs
> supportability.
Good idea. I would print an additional big fat warning of dataloss /
filesystem damage / crash if this could be the case.
Thanks,
regards,
Andreas
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