linux-kernel - [PATCH 0/5] Drivers: hv: Fix NEED_RESCHED

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Message-ID: <20250825200622.3759571-1-seanjc@google.com>
Date: Mon, 25 Aug 2025 13:06:17 -0700
From: Sean Christopherson <seanjc@...gle.com>
To: Marc Zyngier <maz@...nel.org>, Oliver Upton <oliver.upton@...ux.dev>, 
	Catalin Marinas <catalin.marinas@....com>, Will Deacon <will@...nel.org>, 
	Tianrui Zhao <zhaotianrui@...ngson.cn>, Bibo Mao <maobibo@...ngson.cn>, 
	Huacai Chen <chenhuacai@...nel.org>, Anup Patel <anup@...infault.org>, 
	Paul Walmsley <paul.walmsley@...ive.com>, Palmer Dabbelt <palmer@...belt.com>, 
	Albert Ou <aou@...s.berkeley.edu>, Sean Christopherson <seanjc@...gle.com>, 
	Paolo Bonzini <pbonzini@...hat.com>, Thomas Gleixner <tglx@...utronix.de>, Ingo Molnar <mingo@...hat.com>, 
	Borislav Petkov <bp@...en8.de>, Dave Hansen <dave.hansen@...ux.intel.com>, x86@...nel.org, 
	"K. Y. Srinivasan" <kys@...rosoft.com>, Haiyang Zhang <haiyangz@...rosoft.com>, Wei Liu <wei.liu@...nel.org>, 
	Dexuan Cui <decui@...rosoft.com>, Peter Zijlstra <peterz@...radead.org>, 
	Andy Lutomirski <luto@...nel.org>, "Paul E. McKenney" <paulmck@...nel.org>, 
	Frederic Weisbecker <frederic@...nel.org>, Neeraj Upadhyay <neeraj.upadhyay@...nel.org>, 
	Joel Fernandes <joelagnelf@...dia.com>, Josh Triplett <josh@...htriplett.org>, 
	Boqun Feng <boqun.feng@...il.com>, Uladzislau Rezki <urezki@...il.com>
Cc: linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org, 
	kvmarm@...ts.linux.dev, kvm@...r.kernel.org, loongarch@...ts.linux.dev, 
	kvm-riscv@...ts.infradead.org, linux-riscv@...ts.infradead.org, 
	linux-hyperv@...r.kernel.org, rcu@...r.kernel.org
Subject: [PATCH 0/5] Drivers: hv: Fix NEED_RESCHED_LAZY and use common APIs

Fix a bug where MSHV root partitions 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 (which ideally would have been done when MSHV root
support was added).

Assuming all is well, maybe this could go through the tip tree?

The Hyper-V stuff and non-x86 architectures are compile-tested only.

Sean Christopherson (5):
  Drivers: hv: Move TIF pre-guest work handling fully into mshv_common.c
  Drivers: hv: Handle NEED_RESCHED_LAZY before transferring to guest
  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 before running
    guest

 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                          |  1 +
 drivers/hv/mshv.h                           |  2 --
 drivers/hv/mshv_common.c                    | 22 ---------------
 drivers/hv/mshv_root_main.c                 | 31 ++++-----------------
 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 +-
 21 files changed, 49 insertions(+), 93 deletions(-)
 rename include/linux/{entry-kvm.h => entry-virt.h} (83%)
 rename kernel/entry/{kvm.c => virt.c} (66%)


base-commit: 1b237f190eb3d36f52dffe07a40b5eb210280e00
-- 
2.51.0.261.g7ce5a0a67e-goog