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Tue, 25 Aug 2026 15:01:53 -0700 (PDT) From: Mathieu Poirier To: berrange@redhat.com, kchamart@redhat.com, pierrick.bouvier@oss.qualcomm.com, peter.maydell@linaro.org, mst@redhat.com, cohuck@redhat.com, pbonzini@redhat.com, eblake@redhat.com, armbru@redhat.com, lorenzo.pieralisi@linaro.org, gshan@redhat.com, enju.kohei@fujitsu.com Cc: qemu-devel@nongnu.org, qemu-arm@nongnu.org, kvm@vger.kernel.org, mathieu.poirier@linaro.org Subject: [RFC v3 23/24] hw/arm/boot: Load DTB as is for confidential VMs Date: Tue, 25 Aug 2026 16:01:00 -0600 Message-ID: <20260825220101.3443954-24-mathieu.poirier@linaro.org> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20260825220101.3443954-1-mathieu.poirier@linaro.org> References: <20260825220101.3443954-1-mathieu.poirier@linaro.org> Precedence: bulk X-Mailing-List: kvm@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit From: Jean-Philippe Brucker Load DTB without modifications when provided. That way it is possible for a verification entity to reconstruct the Realm's initial measurement. Signed-off-by: Jean-Philippe Brucker Signed-off-by: Mathieu Poirier --- hw/arm/boot.c | 9 ++++++++- 1 file changed, 8 insertions(+), 1 deletion(-) diff --git a/hw/arm/boot.c b/hw/arm/boot.c index 5e85be2bb462..ad588121452a 100644 --- a/hw/arm/boot.c +++ b/hw/arm/boot.c @@ -477,7 +477,14 @@ int arm_load_dtb(hwaddr addr, const struct arm_boot_info *binfo, g_autoptr(MemoryDeviceInfoList) md_list = NULL; Error *err = NULL; - if (binfo->dtb_filename) { + if (binfo->dtb_filename && binfo->confidential) { + /* + * If the user is providing a DTB for a confidential VM, it is already + * tailored to this configuration and measured. Load it as is, without + * any modification. + */ + return rom_add_file_fixed_as(binfo->dtb_filename, addr, -1, as); + } else if (binfo->dtb_filename) { char *filename; filename = qemu_find_file(QEMU_FILE_TYPE_DTB, binfo->dtb_filename); if (!filename) { -- 2.43.0