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Mon, 09 Sep 2024 21:15:49 -0700 (PDT) X-Google-Smtp-Source: AGHT+IESpzFJPvUaYPPTKHz8T4YHLbc03zqgmBJU6sgzN1/EtRPQmV6cfuytRj9V1iBRvh9wsUVF0g== X-Received: by 2002:a17:902:f549:b0:202:5af:47fc with SMTP id d9443c01a7336-206f0511f66mr213103255ad.13.1725941748534; Mon, 09 Sep 2024 21:15:48 -0700 (PDT) Received: from [192.168.68.54] ([103.210.27.31]) by smtp.gmail.com with ESMTPSA id d9443c01a7336-20710e0efbesm40682855ad.40.2024.09.09.21.15.41 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Mon, 09 Sep 2024 21:15:48 -0700 (PDT) Message-ID: <29016e56-e632-422d-a4d2-1891fad2c565@redhat.com> Date: Tue, 10 Sep 2024 14:15:39 +1000 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v5 12/19] efi: arm64: Map Device with Prot Shared To: Steven Price , kvm@vger.kernel.org, kvmarm@lists.linux.dev Cc: Catalin Marinas , Marc Zyngier , Will Deacon , James Morse , Oliver Upton , Suzuki K Poulose , Zenghui Yu , linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, Joey Gouly , Alexandru Elisei , Christoffer Dall , Fuad Tabba , linux-coco@lists.linux.dev, Ganapatrao Kulkarni , Shanker Donthineni , Alper Gun References: <20240819131924.372366-1-steven.price@arm.com> <20240819131924.372366-13-steven.price@arm.com> Content-Language: en-US From: Gavin Shan In-Reply-To: <20240819131924.372366-13-steven.price@arm.com> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit On 8/19/24 11:19 PM, Steven Price wrote: > From: Suzuki K Poulose > > Device mappings need to be emualted by the VMM so must be mapped shared > with the host. > > Signed-off-by: Suzuki K Poulose > Signed-off-by: Steven Price > --- > Changes since v4: > * Reworked to use arm64_is_iomem_private() to decide whether the memory > needs to be decrypted or not. > --- > arch/arm64/kernel/efi.c | 12 ++++++++++-- > 1 file changed, 10 insertions(+), 2 deletions(-) > > diff --git a/arch/arm64/kernel/efi.c b/arch/arm64/kernel/efi.c > index 712718aed5dd..95f8e8bf07f8 100644 > --- a/arch/arm64/kernel/efi.c > +++ b/arch/arm64/kernel/efi.c > @@ -34,8 +34,16 @@ static __init pteval_t create_mapping_protection(efi_memory_desc_t *md) > u64 attr = md->attribute; > u32 type = md->type; > > - if (type == EFI_MEMORY_MAPPED_IO) > - return PROT_DEVICE_nGnRE; > + if (type == EFI_MEMORY_MAPPED_IO) { > + pgprot_t prot = __pgprot(PROT_DEVICE_nGnRE); > + > + if (arm64_is_iomem_private(md->phys_addr, > + md->num_pages << EFI_PAGE_SHIFT)) > + prot = pgprot_encrypted(prot); > + else > + prot = pgprot_decrypted(prot); > + return pgprot_val(prot); > + } > Question: the second parameter (@size) passed to arm64_is_iomem_private() covers the whole region. In [PATCH v5 10/19] arm64: Override set_fixmap_io, the size has been truncated to the granule size (4KB). They look inconsistent and I don't understand the reason. Thanks, Gavin