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[34.91.112.229]) by smtp.gmail.com with ESMTPSA id a640c23a62f3a-abf0c0ba408sm331183566b.37.2025.02.28.10.54.43 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 28 Feb 2025 10:54:43 -0800 (PST) Date: Fri, 28 Feb 2025 18:54:40 +0000 From: Quentin Perret To: Vincent Donnefort 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: <20250228102530.1229089-2-vdonnefort@google.com> 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? > + __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 >