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Thu, 12 Dec 2019 12:58:39 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1576155522; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=DO2JTHXVvoBxHvVNh/C4MODzYKUrxIjfOCU+b9vGhhs=; b=I8hnPzGvsWEq36qri96fQclh3+Dd5CvCfHDR11cod+aHrngxbCIWjDZIynBBJPSyMsqx1k 2kMvdbtYVbnmCufe8He1nwBxHmVoNdp4IBnGb4b/MV76r47Ewb2PxE1lclTFzkFX+xxK9L cUIgNqiJctlNz9QqlY23+oA5nsW/Nyc= From: Wainer dos Santos Moschetta To: qemu-devel@nongnu.org Subject: [PATCH v3 3/5] python/qemu: accel: Strengthen kvm_available() checks Date: Thu, 12 Dec 2019 07:58:29 -0500 Message-Id: <20191212125831.2654-4-wainersm@redhat.com> In-Reply-To: <20191212125831.2654-1-wainersm@redhat.com> References: <20191212125831.2654-1-wainersm@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.84 on 10.5.11.22 X-MC-Unique: jz_V3uRuPW24a0Ganrb9KQ-1 X-Mimecast-Spam-Score: 0 Content-Transfer-Encoding: quoted-printable X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] [fuzzy] X-Received-From: 207.211.31.120 X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: fam@euphon.net, ehabkost@redhat.com, jsnow@redhat.com, alex.bennee@linaro.org, crosa@redhat.com, philmd@redhat.com Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" X-ZohoMail-DKIM: fail (Header signature does not verify) Content-Type: text/plain; charset="utf-8" Currently kvm_available() checks for the presence of kvm module and, if target and host arches don't mismatch. This patch adds an 3rd checking: if QEMU binary was compiled with kvm support. Signed-off-by: Wainer dos Santos Moschetta Reviewed-by: Alex Benn=C3=A9e Reviewed-by: Cleber Rosa Reviewed-by: Philippe Mathieu-Daud=C3=A9 Tested-by: Cleber Rosa --- python/qemu/accel.py | 27 +++++++++++++++++++++------ 1 file changed, 21 insertions(+), 6 deletions(-) diff --git a/python/qemu/accel.py b/python/qemu/accel.py index ddcdbfd9ae..833f9431ce 100644 --- a/python/qemu/accel.py +++ b/python/qemu/accel.py @@ -46,9 +46,24 @@ def list_accel(qemu_bin): # Skip the first line which is the header. return [acc.strip() for acc in out.splitlines()[1:]] =20 -def kvm_available(target_arch=3DNone): - host_arch =3D os.uname()[4] - if target_arch and target_arch !=3D host_arch: - if target_arch !=3D ADDITIONAL_ARCHES.get(host_arch): - return False - return os.access("/dev/kvm", os.R_OK | os.W_OK) +def kvm_available(target_arch=3DNone, qemu_bin=3DNone): + """ + Check if KVM is available using the following heuristic: + - Kernel module is present in the host; + - Target and host arches don't mismatch; + - KVM is enabled in the QEMU binary. + + @param target_arch (str): target architecture + @param qemu_bin (str): path to the QEMU binary + @return True if kvm is available, otherwise False. + """ + if not os.access("/dev/kvm", os.R_OK | os.W_OK): + return False + if target_arch: + host_arch =3D os.uname()[4] + if target_arch !=3D host_arch: + if target_arch !=3D ADDITIONAL_ARCHES.get(host_arch): + return False + if qemu_bin and "kvm" not in list_accel(qemu_bin): + return False + return True --=20 2.21.0