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Thu, 21 May 2026 14:49:48 +0000 Received: from GV1PR08MB7315.eurprd08.prod.outlook.com ([fe80::c249:1aed:a4c2:4193]) by GV1PR08MB7315.eurprd08.prod.outlook.com ([fe80::c249:1aed:a4c2:4193%3]) with mapi id 15.21.0048.013; Thu, 21 May 2026 14:49:48 +0000 From: Sascha Bischoff To: "linux-arm-kernel@lists.infradead.org" , "kvmarm@lists.linux.dev" , "kvm@vger.kernel.org" CC: nd , "maz@kernel.org" , "oliver.upton@linux.dev" , Joey Gouly , Suzuki Poulose , "yuzenghui@huawei.com" , "peter.maydell@linaro.org" , "lpieralisi@kernel.org" , Timothy Hayes Subject: [PATCH v2 02/39] irqchip/gic-v5: Provide OF IRS config frame attrs to KVM Thread-Topic: [PATCH v2 02/39] irqchip/gic-v5: Provide OF IRS config frame attrs to KVM Thread-Index: AQHc6TESIsgjQ1qbnUaAfMlOMM8PRw== Date: Thu, 21 May 2026 14:49:48 +0000 Message-ID: <20260521144846.1899475-3-sascha.bischoff@arm.com> References: <20260521144846.1899475-1-sascha.bischoff@arm.com> In-Reply-To: <20260521144846.1899475-1-sascha.bischoff@arm.com> Accept-Language: en-GB, en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-mailer: git-send-email 2.34.1 Authentication-Results-Original: dkim=none (message not signed) header.d=none;dmarc=none action=none header.from=arm.com; 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X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: agUEnL9fvAcLVSy7vKEJ5N72T8c423I/wrsan81IdGbkWZ5SOAan/4Alj6LeYjkH5p74ReIWqEaBsqYQvqTN4Vo2/NRKvDUSeWuwIiunU40ZheFwPidKuA0tgWhBGz+6AKvwH7ncLrY+AYbjPMUzCbiwS9PV61EztGpToh6ZuHB2dB8gxpu6FbM7Sv4o1gYbx5J1wzqmr01HAwcXB/vdZSKNHrc/1kVpUGNgKKrV+pKJyapgAISeKbnqmMW7vLbWRhLCD5HFfLPjsnDGbSiGaUTp3rbTknD98NbC6IxOG5cPzfBr4HEvkgWYLeFwiuQQ1ALsEP5W3hWAtQBJdWXLliVW3GPURVBgSfACsNo4N8/WSIic3Uv7vUDru/Zys/a9d400T9tTX8/uKBv+5RyEGcmGDsMbt5GW8rQ7B6gAU5aQ9cyPX6rp6LGHBv71hwM3 X-OriginatorOrg: arm.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 21 May 2026 14:50:51.8605 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 35051040-99b4-47f7-6097-08deb7485aa8 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: DU6PEPF0000A7E0.eurprd02.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: AMDPR08MB11368 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.9.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20260521_075059_332060_CCFDC610 X-CRM114-Status: GOOD ( 18.29 ) 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 KVM needs to interact with the host IRS in order to, for example, make VMs or VPEs valid. There are two potential approaches here. Either the host irqchip driver can provide an interface, or KVM can interact directly with the host IRS. The latter of these two is chosen as the set of MMIO registers that KVM needs to interact with is orthogonal to the set used by the host irqchip driver (with the exception of some of the read-only IRS_IDRx registers). Pass KVM a pointer to an IRS config frame - the config frame belonging to ANY IRS is fine as long as one IRS's config frame is used consistently - in struct gic_kvm_info. Additionally, include a flag telling KVM whether the IRS is coherent or non-coherent in order to make sure that KVM can do the correct cache state management, if required. Only OF (Device Tree) is supported with this change. ACPI is not. Signed-off-by: Sascha Bischoff --- drivers/irqchip/irq-gic-v5-irs.c | 7 +++++-- drivers/irqchip/irq-gic-v5.c | 5 +++++ include/linux/irqchip/arm-gic-v5.h | 3 +++ include/linux/irqchip/arm-vgic-info.h | 5 +++++ 4 files changed, 18 insertions(+), 2 deletions(-) diff --git a/drivers/irqchip/irq-gic-v5-irs.c b/drivers/irqchip/irq-gic-v5-= irs.c index f3fce0b1e25d9..607e066821b52 100644 --- a/drivers/irqchip/irq-gic-v5-irs.c +++ b/drivers/irqchip/irq-gic-v5-irs.c @@ -21,8 +21,6 @@ */ #define LPI_ID_BITS_LINEAR 12 =20 -#define IRS_FLAGS_NON_COHERENT BIT(0) - static DEFINE_PER_CPU_READ_MOSTLY(struct gicv5_irs_chip_data *, per_cpu_ir= s_data); static LIST_HEAD(irs_nodes); =20 @@ -50,6 +48,11 @@ static void irs_writeq_relaxed(struct gicv5_irs_chip_dat= a *irs_data, writeq_relaxed(val, irs_data->irs_base + reg_offset); } =20 +struct gicv5_irs_chip_data *gicv5_irs_get_chip_data(void) +{ + return per_cpu(per_cpu_irs_data, 0); +} + /* * The polling wait (in gicv5_wait_for_op_s_atomic()) on a GIC register * provides the memory barriers (through MMIO accessors) diff --git a/drivers/irqchip/irq-gic-v5.c b/drivers/irqchip/irq-gic-v5.c index 600726b5c0a46..707deabbf2f63 100644 --- a/drivers/irqchip/irq-gic-v5.c +++ b/drivers/irqchip/irq-gic-v5.c @@ -1128,6 +1128,8 @@ static struct gic_kvm_info gic_v5_kvm_info __initdata= ; =20 static void __init gic_of_setup_kvm_info(struct device_node *node) { + struct gicv5_irs_chip_data *irs_data =3D gicv5_irs_get_chip_data(); + /* * If we don't have native GICv5 virtualisation support, then * we also don't have FEAT_GCIE_LEGACY - the architecture @@ -1140,6 +1142,9 @@ static void __init gic_of_setup_kvm_info(struct devic= e_node *node) =20 gic_v5_kvm_info.type =3D GIC_V5; =20 + gic_v5_kvm_info.gicv5_irs.base =3D irs_data->irs_base; + gic_v5_kvm_info.gicv5_irs.non_coherent =3D !!(irs_data->flags & IRS_FLAGS= _NON_COHERENT); + /* GIC Virtual CPU interface maintenance interrupt */ gic_v5_kvm_info.maint_irq =3D irq_of_parse_and_map(node, 0); =20 diff --git a/include/linux/irqchip/arm-gic-v5.h b/include/linux/irqchip/arm= -gic-v5.h index f78787e654f4c..681c5c51207d6 100644 --- a/include/linux/irqchip/arm-gic-v5.h +++ b/include/linux/irqchip/arm-gic-v5.h @@ -330,6 +330,8 @@ struct gicv5_irs_chip_data { raw_spinlock_t spi_config_lock; }; =20 +#define IRS_FLAGS_NON_COHERENT BIT(0) + static inline int gicv5_wait_for_op_s_atomic(void __iomem *addr, u32 offse= t, const char *reg_s, u32 mask, u32 *val) @@ -377,6 +379,7 @@ void __init gicv5_free_lpi_domain(void); =20 int gicv5_irs_of_probe(struct device_node *parent); int gicv5_irs_acpi_probe(void); +struct gicv5_irs_chip_data *gicv5_irs_get_chip_data(void); void gicv5_irs_remove(void); int gicv5_irs_enable(void); void gicv5_irs_its_probe(void); diff --git a/include/linux/irqchip/arm-vgic-info.h b/include/linux/irqchip/= arm-vgic-info.h index 67d9d960273b9..f05370e2debf4 100644 --- a/include/linux/irqchip/arm-vgic-info.h +++ b/include/linux/irqchip/arm-vgic-info.h @@ -38,6 +38,11 @@ struct gic_kvm_info { bool has_v4_1; /* Deactivation impared, subpar stuff */ bool no_hw_deactivation; + /* GICv5 IRS base */ + struct { + void __iomem *base; + bool non_coherent; + } gicv5_irs; }; =20 #ifdef CONFIG_KVM --=20 2.34.1