Fix a bug where MSHV root partitions (and upper-level VTL code) don't honor NEED_RESCHED_LAZY, and then deduplicate the TIF related MSHV code by turning the "kvm" entry APIs into more generic "virt" APIs.
This version is based on git://git.kernel.org/pub/scm/linux/kernel/git/hyperv/linux.git hyperv-next in order to pickup the VTL changes that are queued for 6.18. I also squashed the NEED_RESCHED_LAZY fixes for root and VTL modes into a single patch, as it should be easy/straightforward to drop the VTL change as needed if we want this in 6.17 or earlier. That effectively means the full series is dependent on the VTL changes being fully merged for 6.18. But I think that's ok as it's really only the MSHV changes that have any urgency whatsoever, and I assume that Microsoft is the only user that truly cares about the MSHV root fix. I.e. if the whole thing gets delayed, I think it's only the Hyper-V folks that are impacted. I have no preference what tree this goes through, or when, and can respin and/or split as needed. As with v1, the Hyper-V stuff and non-x86 architectures are compile-tested only. v2: - Rebase on hyperv-next. - Fix and converge the VTL code as well. [Peter, Nuno] v1: https://lore.kernel.org/all/20250825200622.3759571-1-sea...@google.com Sean Christopherson (7): Drivers: hv: Handle NEED_RESCHED_LAZY before transferring to guest Drivers: hv: Disentangle VTL return cancellation from SIGPENDING Drivers: hv: Disable IRQs only after handling pending work before VTL return entry/kvm: KVM: Move KVM details related to signal/-EINTR into KVM proper entry: Rename "kvm" entry code assets to "virt" to genericize APIs Drivers: hv: Use common "entry virt" APIs to do work in root before running guest Drivers: hv: Use "entry virt" APIs to do work before returning to lower VTL MAINTAINERS | 2 +- arch/arm64/kvm/Kconfig | 2 +- arch/arm64/kvm/arm.c | 3 +- arch/loongarch/kvm/Kconfig | 2 +- arch/loongarch/kvm/vcpu.c | 3 +- arch/riscv/kvm/Kconfig | 2 +- arch/riscv/kvm/vcpu.c | 3 +- arch/x86/kvm/Kconfig | 2 +- arch/x86/kvm/vmx/vmx.c | 1 - arch/x86/kvm/x86.c | 3 +- drivers/hv/Kconfig | 2 ++ drivers/hv/mshv.h | 2 -- drivers/hv/mshv_common.c | 22 --------------- drivers/hv/mshv_root_main.c | 31 ++++----------------- drivers/hv/mshv_vtl_main.c | 23 +++++++-------- include/linux/{entry-kvm.h => entry-virt.h} | 19 +++++-------- include/linux/kvm_host.h | 17 +++++++++-- include/linux/rcupdate.h | 2 +- kernel/entry/Makefile | 2 +- kernel/entry/{kvm.c => virt.c} | 15 ++++------ kernel/rcu/tree.c | 6 ++-- virt/kvm/Kconfig | 2 +- 22 files changed, 60 insertions(+), 106 deletions(-) rename include/linux/{entry-kvm.h => entry-virt.h} (83%) rename kernel/entry/{kvm.c => virt.c} (66%) base-commit: 03ac62a578566730ab3c320f289f7320798ee2e1 -- 2.51.0.268.g9569e192d0-goog
