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Thu, 04 Jun 2026 15:44:22 +0200 (CEST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1780580668; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding; bh=LV7sqLezgygBgSV+xK0D2dlwQJaZS+1+3eYN++koRdY=; b=ObnZU1VZZtoFlE1Q5b3osOTmi46wIxwqsKGbIOZFWyHqztpEQ9gfIZfEVmU5vu/u6ArdfK lFHcR9VPiDKtCkDr3tBTsrqWaypFlbqokrncTnPdRXvwsc5jiFkqXUj/w8P0xHU1m/hvUe CDts6qUFuZN84XCg9iQqPOrYuCsouRQ= X-MC-Unique: uaYxHzO0Pe-0npzXUrXDFQ-1 X-Mimecast-MFC-AGG-ID: uaYxHzO0Pe-0npzXUrXDFQ_1780580664 From: Gerd Hoffmann To: qemu-devel@nongnu.org Cc: Pierrick Bouvier , Gerd Hoffmann Subject: [PATCH] add a note on -shim to direct kernel boot docs Date: Thu, 4 Jun 2026 15:44:22 +0200 Message-ID: <20260604134422.359214-1-kraxel@redhat.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-Scanned-By: MIMEDefang 3.4.1 on 10.30.177.4 Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists1p.gnu.org; Received-SPF: pass client-ip=170.10.133.124; envelope-from=kraxel@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: -24 X-Spam_score: -2.5 X-Spam_bar: -- X-Spam_report: (-2.5 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.445, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, RCVD_IN_MSPIKE_H5=0.001, RCVD_IN_MSPIKE_WL=0.001, SPF_HELO_PASS=-0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: qemu development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: qemu-devel-bounces+importer=patchew.org@nongnu.org X-ZohoMail-DKIM: pass (identity @redhat.com) X-ZM-MESSAGEID: 1780580706520158500 Content-Type: text/plain; charset="utf-8" Signed-off-by: Gerd Hoffmann --- docs/system/linuxboot.rst | 9 +++++++++ 1 file changed, 9 insertions(+) diff --git a/docs/system/linuxboot.rst b/docs/system/linuxboot.rst index f7573ab80aa2..72af18ce1b5e 100644 --- a/docs/system/linuxboot.rst +++ b/docs/system/linuxboot.rst @@ -17,6 +17,15 @@ Use ``-kernel`` to provide the Linux kernel image and ``= -append`` to give the kernel command line arguments. The ``-initrd`` option can be used to provide an INITRD image. =20 +The ``-shim`` option specifies the shim.efi binary. This is needed +when using direct kernel boot with UEFI secure boot enabled. The +verification chain used by linux distros requires shim.efi. Typically +shim.efi is signed by micsosoft and verified by the firmware. The +linux kernel is signed by the distro and is verified by shim.efi. So +without shim.efi in the loop secure boot verification will not work. +Usually you can find shim.efi as ``EFI/BOOT/BOOT{X64,AA64}.EFI`` on +distro install media. + If you do not need graphical output, you can disable it and redirect the virtual serial port and the QEMU monitor to the console with the ``-nographic`` option. The typical command line is: --=20 2.54.0