On Mon, Apr 27, 2026 at 02:38:51PM -0700, Jork Loeser wrote: > This series fixes kexec support when Linux runs as an L1 Virtual Host > (L1VH) under Hyper-V, using the MSHV driver to manage child VMs. > > 1-2. SynIC cleanup: the MSHV driver manages its own SynIC resources > separately from vmbus. Add proper teardown of MSHV-owned SINTs > and SIRBP on kexec, scoped to only the resources MSHV owns. > Use hv_vmbus_exists() to decide at runtime whether VMBus owns > SIMP/SIEFP/SCONTROL (so MSHV must not touch them) or whether > MSHV must manage them itself (bare root partition without VMBus). > Also fix SIEFP and SIRBP address calculations to use > HV_HYP_PAGE_SHIFT instead of PAGE_SHIFT, which produces wrong > addresses on ARM64 with 64K pages. > > 3. Debugfs stats pages: unmap the VP statistics overlay pages before > kexec to avoid machine check exceptions when the new kernel > reuses those physical pages. > > Changes since v3: > - Dropped patches 1-3 (vmbus variable shadowing, stimer cleanup, > LP/VP skip), now merged via hyperv-next. > - Patch 1: fix SIEFP and SIRBP memremap()/virt_to_phys() to use > HV_HYP_PAGE_SHIFT/HV_HYP_PAGE_SIZE instead of PAGE_SHIFT/PAGE_SIZE. > > Changes since v2: > - Rebased onto linux-next/master to adapt to the upstream SynIC > refactor (commit 5a674ef871fe, "mshv: refactor synic init and > cleanup"). > > Changes since v1: > - Patch 1: account for nested root partitions where VMBus is also > active (not just L1VH); use a vmbus_active local variable; allocate > SIRBP in L1VH allocation path for when the hypervisor doesn't > pre-provision the page. > > Jork Loeser (3): > mshv: limit SynIC management to MSHV-owned resources > mshv: clean up SynIC state on kexec for L1VH > mshv: unmap debugfs stats pages on kexec
Applied to hyperv-fixes. Thanks.
