From: Stanislav Kinsburskii <[email protected]> Sent: Tuesday, April 21, 2026 7:35 AM > > This series refactors the mshv memory region subsystem in preparation > for mapping populated pages into the hypervisor at movable region > creation time, rather than relying solely on demand faulting. > > The primary motivation is to ensure that when userspace passes a > pre-populated mapping for a movable memory region, those pages are > immediately visible to the hypervisor. Previously, all movable regions > were created with HV_MAP_GPA_NO_ACCESS on every page regardless of > whether the backing pages were already present, deferring all mapping > to the fault handler. This added unnecessary fault overhead and > complicated the initial setup of child partitions with pre-populated > memory.
[snip] > > v2: > - Rebased on top of latest mainline, simplified the check for valid PFNs, > added other minor cleanups and improvements. I'm confused about "simplified the check for valid PFNs". I see one place in mshv_region_process_pfns() where a PFN from the mreg_pfns[] array is checked against MSHV_INVALID_PFN instead of doing pfn_valid(). But there are 11 other places in the patch set where pfn_valid() is still used, including in mshv_region_process_pfns(). Michael > > --- > > Stanislav Kinsburskii (7): > mshv: Convert from page pointers to PFNs > mshv: Add support to address range holes remapping > mshv: Support regions with different VMAs > mshv: Move pinned region setup to mshv_regions.c > mshv: Map populated pages on movable region creation > mshv: Extract MMIO region mapping into separate function > mshv: Add tracepoint for map GPA hypercall > > > drivers/hv/mshv_regions.c | 589 > +++++++++++++++++++++++++++++----------- > drivers/hv/mshv_root.h | 29 +- > drivers/hv/mshv_root_hv_call.c | 53 ++-- > drivers/hv/mshv_root_main.c | 99 +------ > drivers/hv/mshv_trace.h | 36 ++ > 5 files changed, 508 insertions(+), 298 deletions(-) >
