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AJvYcCW2yNwrrUHN8IKqH6abJ8ot0GHcqRFHCVoMNwJTh8ldlHgzPeydEHBeYm3vAVefzj36RZjMRZNsCvNgb3g=@vger.kernel.org X-Gm-Message-State: AOJu0YzZV8oSVkoJgiQNAapXrlLGtEDajRmcCBhUrGxauy3NQZ/LNLDO 0mSGCMkJwpY8nPRi/RLWS42oUt3Z6nSB/zCwlMSNe2SoW6B1tlp76N9XNCUiuBYz4NnIAj8utkE 04sdTJhI73g== X-Google-Smtp-Source: AGHT+IFrLa5teCkiJUmugRTGmiVyWcF7Bk2iiIesqhTlDV4Jk+wP67mU9JHmnXeWzq6SoD15OWfRPDjTEIR09g== X-Received: from wmik26.prod.google.com ([2002:a7b:c41a:0:b0:434:f801:bf67]) (user=smostafa job=prod-delivery.src-stubby-dispatcher) by 2002:a05:600c:4446:b0:434:fa73:a907 with SMTP id 5b1f17b1804b1-4361c3723acmr67363395e9.13.1734026727341; Thu, 12 Dec 2024 10:05:27 -0800 (PST) Date: Thu, 12 Dec 2024 18:03:45 +0000 In-Reply-To: <20241212180423.1578358-1-smostafa@google.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Mime-Version: 1.0 References: <20241212180423.1578358-1-smostafa@google.com> X-Mailer: git-send-email 2.47.1.613.gc27f4b7a9f-goog Message-ID: <20241212180423.1578358-22-smostafa@google.com> Subject: [RFC PATCH v2 21/58] KVM: arm64: pkvm: Add __pkvm_host_add_remove_page() From: Mostafa Saleh To: iommu@lists.linux.dev, kvmarm@lists.linux.dev, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org Cc: catalin.marinas@arm.com, will@kernel.org, maz@kernel.org, oliver.upton@linux.dev, joey.gouly@arm.com, suzuki.poulose@arm.com, yuzenghui@huawei.com, robdclark@gmail.com, joro@8bytes.org, robin.murphy@arm.com, jean-philippe@linaro.org, jgg@ziepe.ca, nicolinc@nvidia.com, vdonnefort@google.com, qperret@google.com, tabba@google.com, danielmentz@google.com, tzukui@google.com, Mostafa Saleh Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" From: Jean-Philippe Brucker Add a small helper to remove and add back a page from the host stage-2. This will be used to temporarily unmap a piece of shared sram (device memory) from the host while we handle a SCMI request, preventing the host from modifying the request after it is verified. Signed-off-by: Jean-Philippe Brucker Signed-off-by: Mostafa Saleh --- arch/arm64/kvm/hyp/include/nvhe/mem_protect.h | 1 + arch/arm64/kvm/hyp/nvhe/mem_protect.c | 17 +++++++++++++++++ 2 files changed, 18 insertions(+) diff --git a/arch/arm64/kvm/hyp/include/nvhe/mem_protect.h b/arch/arm64/kvm= /hyp/include/nvhe/mem_protect.h index d75e64e59596..c8f49b335093 100644 --- a/arch/arm64/kvm/hyp/include/nvhe/mem_protect.h +++ b/arch/arm64/kvm/hyp/include/nvhe/mem_protect.h @@ -94,6 +94,7 @@ int __pkvm_guest_relinquish_to_host(struct pkvm_hyp_vcpu = *vcpu, u64 ipa, u64 *ppa); int __pkvm_host_use_dma(u64 phys_addr, size_t size); int __pkvm_host_unuse_dma(u64 phys_addr, size_t size); +int __pkvm_host_add_remove_page(u64 pfn, bool remove); =20 bool addr_is_memory(phys_addr_t phys); int host_stage2_idmap_locked(phys_addr_t addr, u64 size, enum kvm_pgtable_= prot prot); diff --git a/arch/arm64/kvm/hyp/nvhe/mem_protect.c b/arch/arm64/kvm/hyp/nvh= e/mem_protect.c index 0840af20c366..a428ad9ca871 100644 --- a/arch/arm64/kvm/hyp/nvhe/mem_protect.c +++ b/arch/arm64/kvm/hyp/nvhe/mem_protect.c @@ -2521,3 +2521,20 @@ int host_stage2_get_leaf(phys_addr_t phys, kvm_pte_t= *ptep, s8 *level) =20 return ret; } + +/* + * Temporarily unmap a page from the host stage-2, if @remove is true, or = put it + * back. After restoring the ownership to host, the page will be lazy-mapp= ed. + */ +int __pkvm_host_add_remove_page(u64 pfn, bool remove) +{ + int ret; + u64 host_addr =3D hyp_pfn_to_phys(pfn); + u8 owner =3D remove ? PKVM_ID_HYP : PKVM_ID_HOST; + + host_lock_component(); + ret =3D host_stage2_set_owner_locked(host_addr, PAGE_SIZE, owner); + host_unlock_component(); + + return ret; +} --=20 2.47.0.338.g60cca15819-goog