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Tsirkin" , Pedro Barbuda , Mohamed Mediouni , Paolo Bonzini , Zhao Liu , Roman Bolshakov , Wei Liu , Phil Dennis-Jordan Subject: [PATCH v11 04/15] whpx: i386: disable TbFlushHypercalls for emulated LAPIC Date: Mon, 13 Apr 2026 18:52:06 +0200 Message-ID: <20260413165217.47105-5-mohamed@unpredictable.fr> X-Mailer: git-send-email 2.50.1 In-Reply-To: <20260413165217.47105-1-mohamed@unpredictable.fr> References: <20260413165217.47105-1-mohamed@unpredictable.fr> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwNDEzMDE2NiBTYWx0ZWRfXxwal4o7XcHSs XwzwYt5vz6Roq6TGPRTdo5doL2hIA8OMEjYJobySAj+EADEa2yt9TH9z+2ZZRLM4GOBk98o+JN0 EoPl1d1asIoz5PvlS3X8ifcEI5KOiwmLv000Sn6RivtphAQ1is/AjwidGxFAA4klyrBhuqayu6v 9NwW0AnivSpgHKMuOroiNrnfKfc0iRTHIcmRnJ1mNxMO++Gu4j15bBx/3uxzz31ULKBUVPS5+CI veJynqx2V746N0NM2LpLANJSShz2vGh80CEoX+TxD0O3knhk0oWiY1r6R7gBQdeBrfxOglZuBsY OcPmREZ+We+6YrdOnXzkHdswmmi6fl5fXdB874IjVx7wG8c13IC6XUHTxbcRFQ= X-Proofpoint-GUID: aw5CZczzaVh_z1R4ZgvLIbMh_jaMwaI9 X-Authority-Info-Out: v=2.4 cv=botBxUai c=1 sm=1 tr=0 ts=69dd1f6e cx=c_apl:c_pps:t_out a=9OgfyREA4BUYbbCgc0Y0oA==:117 a=9OgfyREA4BUYbbCgc0Y0oA==:17 a=A5OVakUREuEA:10 a=VkNPw1HP01LnGYTKEx00:22 a=Rm0zj2O9plGGl-KjdfMA:9 X-Proofpoint-ORIG-GUID: aw5CZczzaVh_z1R4ZgvLIbMh_jaMwaI9 X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1143,Hydra:6.1.51,FMLib:17.12.100.49 definitions=2026-04-13_03,2026-04-13_04,2025-10-01_01 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 clxscore=1030 adultscore=0 phishscore=0 bulkscore=0 mlxlogscore=710 malwarescore=0 lowpriorityscore=0 spamscore=0 mlxscore=0 suspectscore=0 classifier=spam authscore=0 adjust=0 reason=mlx scancount=1 engine=8.22.0-2601150000 definitions=main-2604130166 Received-SPF: pass client-ip=57.103.69.33; envelope-from=mohamed@unpredictable.fr; helo=outbound.mr.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_MSPIKE_H3=0.001, RCVD_IN_MSPIKE_WL=0.001, RCVD_IN_VALIDITY_RPBL_BLOCKED=0.001, RCVD_IN_VALIDITY_SAFE_BLOCKED=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+qemu-devel=archiver.kernel.org@nongnu.org Sender: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org AccessHypercallRegs was present twice so clean that up. Remove TbFlushHypercalls (and its extended Gva range sub-feature) from the user-mode LAPIC case as it behaves oddly there. Signed-off-by: Mohamed Mediouni --- target/i386/whpx/whpx-all.c | 9 ++++++--- 1 file changed, 6 insertions(+), 3 deletions(-) diff --git a/target/i386/whpx/whpx-all.c b/target/i386/whpx/whpx-all.c index 2d527b90dd..0908dfd134 100644 --- a/target/i386/whpx/whpx-all.c +++ b/target/i386/whpx/whpx-all.c @@ -2489,10 +2489,7 @@ int whpx_accel_init(AccelState *as, MachineState *ms) synthetic_features.Bank0.AccessPartitionReferenceTsc = 1; synthetic_features.Bank0.AccessHypercallRegs = 1; synthetic_features.Bank0.AccessFrequencyRegs = 1; - synthetic_features.Bank0.EnableExtendedGvaRangesForFlushVirtualAddressList = 1; synthetic_features.Bank0.AccessVpIndex = 1; - synthetic_features.Bank0.AccessHypercallRegs = 1; - synthetic_features.Bank0.TbFlushHypercalls = 1; if (whpx_irqchip_in_kernel()) { synthetic_features.Bank0.AccessSynicRegs = 1; @@ -2500,6 +2497,12 @@ int whpx_accel_init(AccelState *as, MachineState *ms) synthetic_features.Bank0.AccessIntrCtrlRegs = 1; synthetic_features.Bank0.SyntheticClusterIpi = 1; synthetic_features.Bank0.DirectSyntheticTimers = 1; + /* + * These technically work without the Hyper-V LAPIC + * but behave oddly for multi-core VMs. + */ + synthetic_features.Bank0.TbFlushHypercalls = 1; + synthetic_features.Bank0.EnableExtendedGvaRangesForFlushVirtualAddressList = 1; } if (is_modern_os && whpx->hyperv_enlightenments_allowed) { -- 2.50.1 (Apple Git-155)