[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] Re: [Xen-devel] [RFC PATCH 0/4] Qemu: Add Xen vIOMMU support
On 2017年03月17日 22:48, Paolo Bonzini wrote: > > > On 17/03/2017 12:29, Lan Tianyu wrote: >> This patchset is to add Xen vIOMMU device model and handle >> irq remapping stuffs. Xen vIOMMU emulation is in the Xen hypervisor >> and the new device module in Qemu works as hypercall wrappers to >> create and destroy vIOMMU in hypervisor. >> >> Xen only supports emulated I440 and so we enable vIOMMU with emulated >> I440 chipset. This works on Linux and Windows guest. > > Any plans to change this? Why is Xen not able to use Q35 with Intel > IOMMU, with only special hooks for interrupt remapping? > > Paolo > Hi Paolo: Thanks for review. For Xen side, we won't reuse Intel IOMMU device model in Qemu and create counterpart in Xen hypervisor. The reasons are 1) Avoid round trips between Qemu and Xen hypervisor 2) Ease of integration with the rest part of the hypervisor(vIOAPIC, vMSI and so on). We don't have plan to enable Q35 for Xen now. There is no dependency between Q35 emulation and vIOMMU implementation from our test. As Stefano mentioned, Anthony worked on the Q35 support before. These two tasks can be done in parallel. -- Best regards Tianyu Lan _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxx https://lists.xen.org/xen-devel
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