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X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: m6Vcop/9NEgbevZtpn/BP6mcP2Dzc1HSaSoJjgomJeWdCeEoFj0iEIq1765oIIrd14XDj+CMszadP/VF8eb8obhVDsFV4wh60xML7noJRUoVpR6wdS0uF5lVpnCJH6Y+/jqnY+7hpQRFCx3YNdU6WfUfITHryCIO94RH9R/IA9ALIccaOdBjrEr9tbnFK6UdF9AeZXi8TeZdVaAS6BLkqi98xfWTnyqL54LyJ6OaoiOTYbjPS1ui6+d3a0OiRnmKWPBK0lc7VSSa2chOtvRWJOr89878mLbKWuDMZTxoty69DqXiFtBx5rg0J6svnyWF1TLQbQEXM72eAgK+6h7F7OfFE9gh2Y81qovVcSZFCAbHCSOSQOSLCcEe96JOQcyjrjQOWYKsrHiVtMvn7Lq509dS62txEJuBDtNVOCB0IhmH4kwE5o4xGfw5VI4sFGSH X-OriginatorOrg: arm.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 27 Apr 2026 16:11:52.7985 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 734ea029-4ea2-4eec-1189-08dea477b215 X-MS-Exchange-CrossTenant-Id: f34e5979-57d9-4aaa-ad4d-b122a662184d X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=f34e5979-57d9-4aaa-ad4d-b122a662184d;Ip=[4.158.2.129];Helo=[outbound-uk1.az.dlp.m.darktrace.com] X-MS-Exchange-CrossTenant-AuthSource: DB1PEPF0003922D.eurprd03.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: PAVPR08MB9700 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20260427_091204_172250_7301FAC1 X-CRM114-Status: GOOD ( 15.44 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org When a VPE is made non-resident and is entering WFI, a doorbell should be requested for the VPE. This allows the VPE to be easily woken once an SPI/LPI interrupt is pending for it. This is tracked by the IRS, which will signal the specific VPE doorbell for the VPE once such an interrupt arrives. Requesting a doorbell involves calculating the DBPM - DoorBell Priority Mask - which ensures that the DB is only signalled by the hardware if the pending interrupt is of sufficient priority. This avoids waking a VPE that can't process the incoming interrupt. Doorbells are NOT requested if a VPE is not entering WFI as we expect to enter again imminently. Signed-off-by: Sascha Bischoff --- arch/arm64/kvm/vgic/vgic-v5.c | 28 ++++++++++++++++++++++++++++ 1 file changed, 28 insertions(+) diff --git a/arch/arm64/kvm/vgic/vgic-v5.c b/arch/arm64/kvm/vgic/vgic-v5.c index 11a1a491b7e0a..2fc6fa4df034f 100644 --- a/arch/arm64/kvm/vgic/vgic-v5.c +++ b/arch/arm64/kvm/vgic/vgic-v5.c @@ -1077,6 +1077,9 @@ void vgic_v5_load(struct kvm_vcpu *vcpu) void vgic_v5_put(struct kvm_vcpu *vcpu) { struct vgic_v5_cpu_if *cpu_if =3D &vcpu->arch.vgic_cpu.vgic_v5; + bool req_db =3D !!vcpu_get_flag(vcpu, IN_WFI); + u32 priority_mask; + int dbpm; =20 /* * Do nothing if we're not resident. This can happen in the WFI path @@ -1090,6 +1093,31 @@ void vgic_v5_put(struct kvm_vcpu *vcpu) kvm_call_hyp(__vgic_v5_save_apr, cpu_if); =20 cpu_if->vgic_contextr =3D 0; + if (req_db) { + /* + * Find the virtual running priority and use this to calculate + * the doorbell priority mask. We combine the highest active + * priority and the CPU's priority mask. The guest can't handle + * interrupts with priorities less than or equal to the virtual + * running priority, so there's literally no point in waking the + * guest for these. + * + * The priority needs to be higher than the mask to signal, so + * pick the next higher priority (subtract 1). + */ + priority_mask =3D vgic_v5_get_effective_priority_mask(vcpu); + + /* Don't request a doorbell if the max priority is masked */ + if (priority_mask) { + dbpm =3D priority_mask - 1; + cpu_if->vgic_contextr =3D FIELD_PREP(ICH_CONTEXTR_EL2_DB, 1) | + FIELD_PREP(ICH_CONTEXTR_EL2_DBPM, dbpm); + } + + /* Make the doorbell affine to this CPU */ + WARN_ON(irq_set_affinity(vgic_v5_vpe_db(vcpu), + cpumask_of(smp_processor_id()))); + } =20 kvm_call_hyp(__vgic_v5_make_non_resident, cpu_if); =20 --=20 2.34.1