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a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1719219184; 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: in-reply-to:in-reply-to:references:references; bh=KnMkczkg0st/7s2vXcXy0ZbukC7y2g2dQra52PJdzn8=; b=ilJsHhT6KUzUpCxORHxwzgA41qZSdybw6YCPawG95lkOXQjwUs7410YdEWiwYQ4Orac51q 93Ta+UiPUZRMUYqc7t9NNo44fz6WCgiQ0Esg3cCL3x25S36rvu8L5TSarVESCRyV5xsSRd 76Wn2/+iytHSkwvS8MfhqG6jRnQpNGM= X-MC-Unique: MUeuOACYPf2FP8OQP6lOAg-1 From: Michal Privoznik To: qemu-devel@nongnu.org Cc: pbonzini@redhat.com, mtosatti@redhat.com, michael.roth@amd.com Subject: [PATCH 2/2] i386/sev: Fallback to the default SEV device if none provided in sev_get_capabilities() Date: Mon, 24 Jun 2024 10:52:49 +0200 Message-ID: <157f93712c23818be193ce785f648f0060b33dee.1719218926.git.mprivozn@redhat.com> In-Reply-To: References: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-Scanned-By: MIMEDefang 3.0 on 10.30.177.17 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=lists.gnu.org; Received-SPF: pass client-ip=170.10.129.124; envelope-from=mprivozn@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: 11 X-Spam_score: 1.1 X-Spam_bar: + X-Spam_report: (1.1 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.149, 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_H4=-0.01, RCVD_IN_MSPIKE_WL=-0.01, RCVD_IN_SBL_CSS=3.335, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=no autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: 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: 1719219238753100007 Content-Type: text/plain; charset="utf-8" When management tools (e.g. libvirt) query QEMU capabilities, they start QEMU with a minimalistic configuration and issue various commands on monitor. One of the command issued is/might be "query-sev-capabilities" to learn values like cbitpos or reduced-phys-bits. But as of v9.0.0-1145-g16dcf200dc the monitor command returns an error instead. This creates a chicken-egg problem because in order to query those aforementioned values QEMU needs to be started with a 'sev-guest' object. But to start QEMU with the values must be known. I think it's safe to assume that the default path ("/dev/sev") provides the same data as user provided one. So fall back to it. Fixes: 16dcf200dc951c1cde3e5b442457db5f690b8cf0 Signed-off-by: Michal Privoznik --- target/i386/sev.c | 10 +++++----- 1 file changed, 5 insertions(+), 5 deletions(-) diff --git a/target/i386/sev.c b/target/i386/sev.c index 8c350d42b0..5bb1ceb3ad 100644 --- a/target/i386/sev.c +++ b/target/i386/sev.c @@ -585,13 +585,13 @@ static SevCapability *sev_get_capabilities(Error **er= rp) } =20 sev_common =3D SEV_COMMON(MACHINE(qdev_get_machine())->cgs); - if (!sev_common) { - error_setg(errp, "SEV is not configured"); - return NULL; + if (sev_common) { + sev_device =3D object_property_get_str(OBJECT(sev_common), "sev-de= vice", + &error_abort); + } else { + sev_device =3D g_strdup(DEFAULT_SEV_DEVICE); } =20 - sev_device =3D object_property_get_str(OBJECT(sev_common), "sev-device= ", - &error_abort); fd =3D open(sev_device, O_RDWR); if (fd < 0) { error_setg_errno(errp, errno, "SEV: Failed to open %s", --=20 2.44.2