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[35.195.168.105]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-390e47b7a73sm14106715f8f.50.2025.03.03.01.08.54 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 03 Mar 2025 01:08:54 -0800 (PST) Date: Mon, 3 Mar 2025 09:08:50 +0000 From: Vincent Donnefort To: Quentin Perret Cc: maz@kernel.org, oliver.upton@linux.dev, joey.gouly@arm.com, suzuki.poulose@arm.com, yuzenghui@huawei.com, catalin.marinas@arm.com, will@kernel.org, linux-arm-kernel@lists.infradead.org, kvmarm@lists.linux.dev, linux-kernel@vger.kernel.org, kernel-team@android.com Subject: Re: [PATCH 1/9] KVM: arm64: Handle huge mappings for np-guest CMOs Message-ID: References: <20250228102530.1229089-1-vdonnefort@google.com> <20250228102530.1229089-2-vdonnefort@google.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: On Fri, Feb 28, 2025 at 06:54:40PM +0000, Quentin Perret wrote: > On Friday 28 Feb 2025 at 10:25:17 (+0000), Vincent Donnefort wrote: > > diff --git a/arch/arm64/kvm/hyp/nvhe/mem_protect.c b/arch/arm64/kvm/hyp/nvhe/mem_protect.c > > index 19c3c631708c..a796e257c41f 100644 > > --- a/arch/arm64/kvm/hyp/nvhe/mem_protect.c > > +++ b/arch/arm64/kvm/hyp/nvhe/mem_protect.c > > @@ -219,14 +219,24 @@ static void guest_s2_put_page(void *addr) > > > > static void clean_dcache_guest_page(void *va, size_t size) > > { > > - __clean_dcache_guest_page(hyp_fixmap_map(__hyp_pa(va)), size); > > - hyp_fixmap_unmap(); > > + while (size) { > > Nit: not a problem at the moment, but this makes me mildly worried if > size ever became non-page-aligned, could we make the code robust to > that? The fixmap doesn't handle !ALIGNED adresses. (I have a patch in the tracing series to cover that though). So wonder if that really makes sense to handle unaligned size while it wouldn't work with unaligned va anyway? Perhaps just a WARN_ON() then? > > > + __clean_dcache_guest_page(hyp_fixmap_map(__hyp_pa(va)), > > + PAGE_SIZE); > > + hyp_fixmap_unmap(); > > + va += PAGE_SIZE; > > + size -= PAGE_SIZE; > > + } > > } > > > > static void invalidate_icache_guest_page(void *va, size_t size) > > { > > - __invalidate_icache_guest_page(hyp_fixmap_map(__hyp_pa(va)), size); > > - hyp_fixmap_unmap(); > > + while (size) { > > + __invalidate_icache_guest_page(hyp_fixmap_map(__hyp_pa(va)), > > + PAGE_SIZE); > > + hyp_fixmap_unmap(); > > + va += PAGE_SIZE; > > + size -= PAGE_SIZE; > > + } > > } > > > > int kvm_guest_prepare_stage2(struct pkvm_hyp_vm *vm, void *pgd) > > -- > > 2.48.1.711.g2feabab25a-goog > >