linux-kernel - [PATCH 0/2] RCU related fix based on kvm-coco-queue.

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Message-ID: <20241104084137.29855-1-yan.y.zhao@intel.com>
Date: Mon,  4 Nov 2024 16:41:37 +0800
From: Yan Zhao <yan.y.zhao@...el.com>
To: pbonzini@...hat.com,
	seanjc@...gle.com
Cc: linux-kernel@...r.kernel.org,
	kvm@...r.kernel.org,
	Yan Zhao <yan.y.zhao@...el.com>
Subject: [PATCH 0/2] RCU related fix based on kvm-coco-queue.

Hi Paolo and Sean,

The two patches are fixups to RCU related issues reported by sparse.

Patch 1 was reported by kernel test robot related to dereference of
        mirrored sptep.

Patch 2 was a result of running sparse locally with error message:
        "error: incompatible types in comparison expression (different
        address spaces)" in kvm_gmem_get_file() and __kvm_gmem_get_pfn().

        Initially, I wanted to fix it by using rcu_access_pointer() to
        fetch the rcu-protected pointer slot->gmem.file.

        However, after further analysis, I think it's not necessary to
        rely on RCU to protect slot->gmem.file.

Please kindly take a look to see if they are appropriate.

Thanks
Yan


Rick Edgecombe (1):
  KVM: x86/tdp_mmu: Use rcu_dereference() to protect sptep for
    dereferencing

Yan Zhao (1):
  KVM: guest_memfd: Remove RCU-protected attribute from slot->gmem.file

 arch/x86/kvm/mmu/spte.h    |  4 ++--
 arch/x86/kvm/mmu/tdp_mmu.c |  6 +++---
 include/linux/kvm_host.h   |  2 +-
 virt/kvm/guest_memfd.c     | 23 ++++++++++-------------
 4 files changed, 16 insertions(+), 19 deletions(-)


base-commit: 49c492a89914b02fa5011d9ea9848318c6c98dd9
-- 
2.43.2