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Mon, 09 Feb 2026 09:22:08 +0000 Date: Mon, 09 Feb 2026 09:22:07 +0000 Message-ID: <86y0l2b7b4.wl-maz@kernel.org> From: Marc Zyngier To: Cc: Oliver Upton , Joey Gouly , Suzuki K Poulose , Zenghui Yu , Catalin Marinas , Will Deacon , Matthias Brugger , AngeloGioacchino Del Regno , Quentin Perret , Vincent Donnefort , , , , , , , Subject: Re: [PATCH] KVM: arm64: Allow module-owned pages in host stage-2 range adjustment In-Reply-To: <20260209032421.1278325-1-kyle-jk.liao@mediatek.com> References: <20260209032421.1278325-1-kyle-jk.liao@mediatek.com> User-Agent: Wanderlust/2.15.9 (Almost Unreal) SEMI-EPG/1.14.7 (Harue) FLIM-LB/1.14.9 (=?UTF-8?B?R29qxY0=?=) APEL-LB/10.8 EasyPG/1.0.0 Emacs/30.1 (aarch64-unknown-linux-gnu) MULE/6.0 (HANACHIRUSATO) MIME-Version: 1.0 (generated by SEMI-EPG 1.14.7 - "Harue") Content-Type: text/plain; charset=US-ASCII X-SA-Exim-Connect-IP: 185.219.108.64 X-SA-Exim-Rcpt-To: kyle-jk.liao@mediatek.com, oupton@kernel.org, joey.gouly@arm.com, suzuki.poulose@arm.com, yuzenghui@huawei.com, catalin.marinas@arm.com, will@kernel.org, matthias.bgg@gmail.com, angelogioacchino.delregno@collabora.com, qperret@google.com, vdonnefort@google.com, linux-arm-kernel@lists.infradead.org, kvmarm@lists.linux.dev, linux-kernel@vger.kernel.org, linux-mediatek@lists.infradead.org, wsd_upstream@mediatek.com, rock.yeh@mediatek.com, hungwen.chien@mediatek.com X-SA-Exim-Mail-From: maz@kernel.org X-SA-Exim-Scanned: No (on disco-boy.misterjones.org); SAEximRunCond expanded to false X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org On Mon, 09 Feb 2026 03:24:13 +0000, wrote: > > From: "kyle-jk.liao" > > The host_stage2_adjust_range() function triggers a WARN_ON when > encountering pages marked as both PKVM_NOPAGE and PKVM_MODULE_OWNED_PAGE. > This occurs when load_unaligned_zeropad() accesses memory that crosses > page boundaries, where one of the pages is module-owned. > > Extend the check to accept pages with the PKVM_MODULE_OWNED_PAGE flag > in addition to PKVM_NOPAGE, preventing spurious warnings during normal > module memory access patterns. > > Signed-off-by: kyle-jk.liao > --- > arch/arm64/kvm/hyp/nvhe/mem_protect.c | 4 +++- > 1 file changed, 3 insertions(+), 1 deletion(-) > > diff --git a/arch/arm64/kvm/hyp/nvhe/mem_protect.c b/arch/arm64/kvm/hyp/nvhe/mem_protect.c > index 49db32f3ddf7..baaabf4b5112 100644 > --- a/arch/arm64/kvm/hyp/nvhe/mem_protect.c > +++ b/arch/arm64/kvm/hyp/nvhe/mem_protect.c > @@ -495,6 +495,7 @@ static int host_stage2_adjust_range(u64 addr, struct kvm_mem_range *range) > u64 granule; > s8 level; > int ret; > + enum pkvm_page_state state; > > hyp_assert_lock_held(&host_mmu.lock); > ret = kvm_pgtable_get_leaf(&host_mmu.pgt, addr, &pte, &level); > @@ -505,8 +506,9 @@ static int host_stage2_adjust_range(u64 addr, struct kvm_mem_range *range) > return -EAGAIN; > > if (pte) { > + state = get_host_state(hyp_phys_to_page(addr)); > WARN_ON(addr_is_memory(addr) && > - get_host_state(hyp_phys_to_page(addr)) != PKVM_NOPAGE); > + (state != PKVM_NOPAGE && state != (PKVM_NOPAGE | PKVM_MODULE_OWNED_PAGE))); > return -EPERM; > } > None of that exists upstream. M. -- Without deviation from the norm, progress is not possible.