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

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Message-ID: <aKzjHjtI2fbFjBpe@liuwe-devbox-ubuntu-v2.tail21d00.ts.net>
Date: Mon, 25 Aug 2025 22:26:38 +0000
From: Wei Liu <wei.liu@...nel.org>
To: Peter Zijlstra <peterz@...radead.org>
Cc: Sean Christopherson <seanjc@...gle.com>, 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>,
	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
Subject: Re: [PATCH 0/5] Drivers: hv: Fix NEED_RESCHED_LAZY and use common
 APIs

On Tue, Aug 26, 2025 at 12:23:19AM +0200, Peter Zijlstra wrote:
> On Mon, Aug 25, 2025 at 01:06:17PM -0700, Sean Christopherson wrote:
> > 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.
> 
> I suspect there's more of this wreckage in the new VTL driver that
> they just put in:
> 
>   https://lore.kernel.org/all/20250729051436.190703-3-namjain@linux.microsoft.com/
> 
> although ideally they rip that thing out. I don't know how that code can
> ever be correct.

Please give us some time, Peter. I have asked the corresponding team to
respond to your comments.

Wei