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Tsirkin" , Alexander Graf , qemu-arm@nongnu.org, Peter Maydell , Marcel Apfelbaum , Yanan Wang , Richard Henderson , Cameron Esfahani , Paolo Bonzini , =?UTF-8?q?Marc-Andr=C3=A9=20Lureau?= Subject: [PATCH v4 12/17] hw/arm: virt: cleanly fail on attempt to use the platform vGIC together with ITS Date: Mon, 4 Aug 2025 16:23:21 +0200 Message-Id: <20250804142326.72947-13-mohamed@unpredictable.fr> X-Mailer: git-send-email 2.39.5 (Apple Git-154) In-Reply-To: <20250804142326.72947-1-mohamed@unpredictable.fr> References: <20250804142326.72947-1-mohamed@unpredictable.fr> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-Proofpoint-GUID: o3xms7nH0xeZ8GolPNmofEn6MO1EfNVS X-Proofpoint-ORIG-GUID: o3xms7nH0xeZ8GolPNmofEn6MO1EfNVS X-Proofpoint-Spam-Details-Enc: AW1haW4tMjUwODA0MDA4MCBTYWx0ZWRfX5rXj+l+NXMOl T+RvLlmoiMsoQBnz0vyJRNfSCZhZza2CMKBGSlh1ZjtVmg8YMnaez+UXOLvtKgJvcg20Kf+iJvN O7bsbbv13r55A1B5VgzLc4gApMoLX/oNyRsJRGoR0BjmT1vPsu7oHB5ZxDwgCR+7k5hGMka3Fwi f2ghhA8G4dy62maW/6wxAXianlL+WblA4/5G1DSoGrvyqHygTkQ+Rc5ZdgAZ1jSmLndFJIzYgVG gchoXsPwgavFqmDS0nD/QjI78tfWKCZkSkhbE5joizkPhhAbqxhV3q8lAGjFcV6VZOiLgzUsc= X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1099,Hydra:6.1.9,FMLib:17.12.80.40 definitions=2025-08-04_06,2025-08-04_01,2025-03-28_01 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 spamscore=0 suspectscore=0 clxscore=1030 phishscore=0 mlxlogscore=999 bulkscore=0 malwarescore=0 adultscore=0 mlxscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.22.0-2506270000 definitions=main-2508040080 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=57.103.85.161; envelope-from=mohamed@unpredictable.fr; helo=outbound.qs.icloud.com X-Spam_score_int: -27 X-Spam_score: -2.8 X-Spam_bar: -- X-Spam_report: (-2.8 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_LOW=-0.7, RCVD_IN_VALIDITY_RPBL_BLOCKED=0.001, RCVD_IN_VALIDITY_SAFE_BLOCKED=0.001, SPF_HELO_NONE=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: 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 @unpredictable.fr) X-ZM-MESSAGEID: 1754322741821124100 Content-Type: text/plain; charset="utf-8" Windows Hypervisor Platform's vGIC doesn't support ITS. Deal with this by reporting to the user and not creating the ITS device. Signed-off-by: Mohamed Mediouni --- hw/arm/virt.c | 10 ++++++++++ 1 file changed, 10 insertions(+) diff --git a/hw/arm/virt.c b/hw/arm/virt.c index 98a1c74c42..0039f6a12b 100644 --- a/hw/arm/virt.c +++ b/hw/arm/virt.c @@ -741,6 +741,16 @@ static void create_its(VirtMachineState *vms) return; } =20 + if (whpx_enabled() && vms->tcg_its) { + /* + * Signal to the user when ITS is neither supported by the host + * nor emulated by the machine. + */ + info_report("ITS not supported on WHPX."); + info_report("To support MSIs, use its=3Doff to enable GICv3 + GICv= 2m."); + return; + } + dev =3D qdev_new(its_class_name()); =20 object_property_set_link(OBJECT(dev), "parent-gicv3", OBJECT(vms->gic), --=20 2.39.5 (Apple Git-154)