Re: RFC: vfio API changes needed for powerpc (v3)
On Tue, Apr 09, 2013 at 01:22:15AM +, Yoder Stuart-B08248 wrote: What happens if a normal unmap call is done on the MSI iova? Do we need a separate unmap? I was thinking a normal unmap on an MSI windows would be an error...but I'm not set on that. I put the msi unmap there to make things symmetric, a normal unmap would work as well...and then we could drop the msi unmap. Hmm, this API semantic isn't very clean. When you explicitly map the MSI banks a clean API would also allow to unmap them. But that is not possible in your design because the kernel is responsible for mapping MSIs and you can't unmap a MSI bank that is in use by the kernel. So since the kernel owns the MSI setup anyways it should also take care of mapping the MSI banks. What is the reason to not let the kernel allocate the MSI banks top-down from the end of the DMA window space? Just let userspace know (or even set if needed) in advance how many of the windows it configures the kernel will take for mapping MSI banks and you are fine, no? Joerg ___ iommu mailing list iommu@lists.linux-foundation.org https://lists.linuxfoundation.org/mailman/listinfo/iommu
Re: [PATCH 2/5 v11] powerpc: Add iommu domain pointer to device archdata
On Mar 28, 2013, at 2:53 PM, Varun Sethi wrote: Add an iommu domain pointer to device (powerpc) archdata. Devices are attached to iommu domains and this pointer provides a mechanism to correlate between a device and the associated iommu domain. This field is set when a device is attached to a domain. Signed-off-by: Varun Sethi varun.se...@freescale.com --- - no change in v11. - no change in v10. - Added CONFIG_IOMMU_API in v9. arch/powerpc/include/asm/device.h |6 ++ 1 files changed, 6 insertions(+), 0 deletions(-) Acked-by: Kumar Gala ga...@kernel.crashing.org - k ___ iommu mailing list iommu@lists.linux-foundation.org https://lists.linuxfoundation.org/mailman/listinfo/iommu
Re: RFC: vfio API changes needed for powerpc (v3)
On 04/11/2013 07:56:59 AM, Joerg Roedel wrote: On Tue, Apr 09, 2013 at 01:22:15AM +, Yoder Stuart-B08248 wrote: What happens if a normal unmap call is done on the MSI iova? Do we need a separate unmap? I was thinking a normal unmap on an MSI windows would be an error...but I'm not set on that. I put the msi unmap there to make things symmetric, a normal unmap would work as well...and then we could drop the msi unmap. Hmm, this API semantic isn't very clean. When you explicitly map the MSI banks a clean API would also allow to unmap them. But that is not possible in your design because the kernel is responsible for mapping MSIs and you can't unmap a MSI bank that is in use by the kernel. Why is it not possible to unmap them? Once they've been mapped, they're just like any other IOMMU mapping. If the user breaks MSI for their own devices by unmapping the MSI page, that's their problem. So since the kernel owns the MSI setup anyways it should also take care of mapping the MSI banks. What is the reason to not let the kernel allocate the MSI banks top-down from the end of the DMA window space? It's less flexible, and possibly more complicated. -Scott ___ iommu mailing list iommu@lists.linux-foundation.org https://lists.linuxfoundation.org/mailman/listinfo/iommu
Re: [PATCH 7/9] iommu/amd: Add ioapic and hpet ivrs override
On 4/9/2013 3:29 PM, Joerg Roedel wrote: On Tue, Apr 09, 2013 at 10:13:02PM +0200, Joerg Roedel wrote: Add two new kernel commandline parameters ivrs_ioapic and ivrs_hpet to override the Id-DeviceId mapping from the IVRS ACPI table. This can be used to work around broken BIOSes to get interrupt remapping working on AMD systems. Signed-off-by: Joerg Roedel j...@8bytes.org Forgot to add: Tested-by: Borislav Petkov b...@suse.de I also tested on some other systems here and the patch works also. Suravee ___ iommu mailing list iommu@lists.linux-foundation.org https://lists.linuxfoundation.org/mailman/listinfo/iommu ___ iommu mailing list iommu@lists.linux-foundation.org https://lists.linuxfoundation.org/mailman/listinfo/iommu
