linux-kernel - Re: [PATCH v3 04/25] KVM: x86/mmu: Add dedicated API to map guest

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Message-ID: <aPhjYcOFjL1Z8m2s@yzhao56-desk.sh.intel.com>
Date: Wed, 22 Oct 2025 12:53:53 +0800
From: Yan Zhao <yan.y.zhao@...el.com>
To: Sean Christopherson <seanjc@...gle.com>
CC: Marc Zyngier <maz@...nel.org>, Oliver Upton <oliver.upton@...ux.dev>,
	Tianrui Zhao <zhaotianrui@...ngson.cn>, Bibo Mao <maobibo@...ngson.cn>,
	Huacai Chen <chenhuacai@...nel.org>, Madhavan Srinivasan
	<maddy@...ux.ibm.com>, Anup Patel <anup@...infault.org>, Paul Walmsley
	<pjw@...nel.org>, Palmer Dabbelt <palmer@...belt.com>, Albert Ou
	<aou@...s.berkeley.edu>, Christian Borntraeger <borntraeger@...ux.ibm.com>,
	Janosch Frank <frankja@...ux.ibm.com>, Claudio Imbrenda
	<imbrenda@...ux.ibm.com>, Paolo Bonzini <pbonzini@...hat.com>, "Kirill A.
 Shutemov" <kas@...nel.org>, <linux-arm-kernel@...ts.infradead.org>,
	<kvmarm@...ts.linux.dev>, <kvm@...r.kernel.org>, <loongarch@...ts.linux.dev>,
	<linux-mips@...r.kernel.org>, <linuxppc-dev@...ts.ozlabs.org>,
	<kvm-riscv@...ts.infradead.org>, <linux-riscv@...ts.infradead.org>,
	<x86@...nel.org>, <linux-coco@...ts.linux.dev>,
	<linux-kernel@...r.kernel.org>, Ira Weiny <ira.weiny@...el.com>, Kai Huang
	<kai.huang@...el.com>, Michael Roth <michael.roth@....com>, Vishal Annapurve
	<vannapurve@...gle.com>, Rick Edgecombe <rick.p.edgecombe@...el.com>,
	Ackerley Tng <ackerleytng@...gle.com>, Binbin Wu <binbin.wu@...ux.intel.com>
Subject: Re: [PATCH v3 04/25] KVM: x86/mmu: Add dedicated API to map
 guest_memfd pfn into TDP MMU

On Thu, Oct 16, 2025 at 05:32:22PM -0700, Sean Christopherson wrote:
> Link: https://lore.kernel.org/all/20250709232103.zwmufocd3l7sqk7y@amd.com

Hi Sean,                                                                         

Will you post [1] to fix the AB-BA deadlock issue for huge page in-place
conversion as well?

Without it, the "WARNING: possible circular locking dependency detected" would
still appear due to

- lock(mapping.invalidate_lock#4) --> lock(&mm->mmap_lock)
  for init mem on non-in-place-conversion guest_memfd
- rlock(&mm->mmap_lock) --> rlock(mapping.invalidate_lock#4)
  for faulting shared pages on in-place-convertion guest_memfd

[1] https://lore.kernel.org/all/aHEwT4X0RcfZzHlt@google.com/                     
                                                                                 
Thanks                                                                           
Yan