linux-kernel - Re: [PATCH v2 0/7] Drivers: hv: Fix NEED_RESCHED

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Message-ID: <aLojpyTwAMdb1z6D@liuwe-devbox-ubuntu-v2.lamzopl0uupeniq2etz1fddiyg.xx.internal.cloudapp.net>
Date: Thu, 4 Sep 2025 23:41:27 +0000
From: Wei Liu <wei.liu@...nel.org>
To: Sean Christopherson <seanjc@...gle.com>
Cc: 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>,
	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>, 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,
	Nuno Das Neves <nunodasneves@...ux.microsoft.com>,
	Mukesh R <mrathor@...ux.microsoft.com>
Subject: Re: [PATCH v2 0/7] Drivers: hv: Fix NEED_RESCHED_LAZY and use common
 APIs

On Wed, Aug 27, 2025 at 05:01:49PM -0700, Sean Christopherson wrote:
> 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-seanjc@google.com
> 

I dropped the mshv_vtl changes in this series and applied the rest
(including the KVM changes) to hyperv-next.

Thanks,
Wei