On 28.04.2025 22:02, Stefano Stabellini wrote: > On Mon, 28 Apr 2025, Teddy Astie wrote: >> Hello Stefano, >> >> Le 25/04/2025 à 22:21, Stefano Stabellini a écrit : >>> From: Xenia Ragiadakou <xenia.ragiada...@amd.com> >>> >>> Dom0 PVH might need XENMEM_exchange when passing contiguous memory >>> addresses to firmware or co-processors not behind an IOMMU. >>> >>> XENMEM_exchange was blocked for HVM/PVH DomUs, and accidentally it >>> impacted Dom0 PVH as well. >>> >>> Permit Dom0 PVH to call XENMEM_exchange while leaving it blocked for >>> HVM/PVH DomUs. >>> >> >> In addition to Jan's remarks, I think it wants some additional >> clarifications on the hypercall interface. public/memory.h indicates >> "only PV guests can use this operation", so the interface is actually >> unspecified about HVM guests (e.g what are MFN/GMFN in this case ?). > > That is a new addition from c08a11ab98c.
Later addition or not, I agree with Teddy that it wants amending. Jan > If you see fae7d5be8bb, there > is a statement that "we permitted this operation".
