[PATCH v7 08/16] virt: geniezone: Add irqchip support for virtual interrupt injection
From: Yi-De Wu
Date: Thu Nov 16 2023 - 10:29:42 EST
From: "Yingshiuan Pan" <yingshiuan.pan@xxxxxxxxxxxx>
Enable GenieZone to handle virtual interrupt injection request.
Signed-off-by: Yingshiuan Pan <yingshiuan.pan@xxxxxxxxxxxx>
Signed-off-by: kevenny hsieh <kevenny.hsieh@xxxxxxxxxxxx>
Signed-off-by: Yi-De Wu <yi-de.wu@xxxxxxxxxxxx>
Signed-off-by: Liju Chen <liju-clr.chen@xxxxxxxxxxxx>
---
arch/arm64/geniezone/Makefile | 2 +-
arch/arm64/geniezone/gzvm_arch_common.h | 4 ++
arch/arm64/geniezone/vgic.c | 50 +++++++++++++++
drivers/virt/geniezone/gzvm_common.h | 12 ++++
drivers/virt/geniezone/gzvm_vm.c | 81 +++++++++++++++++++++++++
include/linux/gzvm_drv.h | 4 ++
include/uapi/linux/gzvm.h | 66 ++++++++++++++++++++
7 files changed, 218 insertions(+), 1 deletion(-)
create mode 100644 arch/arm64/geniezone/vgic.c
create mode 100644 drivers/virt/geniezone/gzvm_common.h
diff --git a/arch/arm64/geniezone/Makefile b/arch/arm64/geniezone/Makefile
index 69b0a4abeab0..0e4f1087f9de 100644
--- a/arch/arm64/geniezone/Makefile
+++ b/arch/arm64/geniezone/Makefile
@@ -4,6 +4,6 @@
#
include $(srctree)/drivers/virt/geniezone/Makefile
-gzvm-y += vm.o vcpu.o
+gzvm-y += vm.o vcpu.o vgic.o
obj-$(CONFIG_MTK_GZVM) += gzvm.o
diff --git a/arch/arm64/geniezone/gzvm_arch_common.h b/arch/arm64/geniezone/gzvm_arch_common.h
index 276c45337344..6338e88e98e1 100644
--- a/arch/arm64/geniezone/gzvm_arch_common.h
+++ b/arch/arm64/geniezone/gzvm_arch_common.h
@@ -17,6 +17,8 @@ enum {
GZVM_FUNC_RUN = 5,
GZVM_FUNC_GET_ONE_REG = 8,
GZVM_FUNC_SET_ONE_REG = 9,
+ GZVM_FUNC_IRQ_LINE = 10,
+ GZVM_FUNC_CREATE_DEVICE = 11,
GZVM_FUNC_PROBE = 12,
GZVM_FUNC_ENABLE_CAP = 13,
GZVM_FUNC_INFORM_EXIT = 14,
@@ -37,6 +39,8 @@ enum {
#define MT_HVC_GZVM_RUN GZVM_HCALL_ID(GZVM_FUNC_RUN)
#define MT_HVC_GZVM_GET_ONE_REG GZVM_HCALL_ID(GZVM_FUNC_GET_ONE_REG)
#define MT_HVC_GZVM_SET_ONE_REG GZVM_HCALL_ID(GZVM_FUNC_SET_ONE_REG)
+#define MT_HVC_GZVM_IRQ_LINE GZVM_HCALL_ID(GZVM_FUNC_IRQ_LINE)
+#define MT_HVC_GZVM_CREATE_DEVICE GZVM_HCALL_ID(GZVM_FUNC_CREATE_DEVICE)
#define MT_HVC_GZVM_PROBE GZVM_HCALL_ID(GZVM_FUNC_PROBE)
#define MT_HVC_GZVM_ENABLE_CAP GZVM_HCALL_ID(GZVM_FUNC_ENABLE_CAP)
#define MT_HVC_GZVM_INFORM_EXIT GZVM_HCALL_ID(GZVM_FUNC_INFORM_EXIT)
diff --git a/arch/arm64/geniezone/vgic.c b/arch/arm64/geniezone/vgic.c
new file mode 100644
index 000000000000..122125f7f8d4
--- /dev/null
+++ b/arch/arm64/geniezone/vgic.c
@@ -0,0 +1,50 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (c) 2023 MediaTek Inc.
+ */
+
+#include <linux/irqchip/arm-gic-v3.h>
+#include <linux/gzvm.h>
+#include <linux/gzvm_drv.h>
+#include "gzvm_arch_common.h"
+
+int gzvm_arch_create_device(u16 vm_id, struct gzvm_create_device *gzvm_dev)
+{
+ struct arm_smccc_res res;
+
+ return gzvm_hypcall_wrapper(MT_HVC_GZVM_CREATE_DEVICE, vm_id,
+ virt_to_phys(gzvm_dev), 0, 0, 0, 0, 0,
+ &res);
+}
+
+/**
+ * gzvm_arch_inject_irq() - Inject virtual interrupt to a VM
+ * @gzvm: Pointer to struct gzvm
+ * @vcpu_idx: vcpu index, only valid if PPI
+ * @irq: *SPI* irq number (excluding offset value `32`)
+ * @level: 1 if true else 0
+ *
+ * Return:
+ * * 0 - Success.
+ * * Negative - Failure.
+ */
+int gzvm_arch_inject_irq(struct gzvm *gzvm, unsigned int vcpu_idx,
+ u32 irq, bool level)
+{
+ unsigned long a1 = assemble_vm_vcpu_tuple(gzvm->vm_id, vcpu_idx);
+ struct arm_smccc_res res;
+
+ /*
+ * VMM's virtual device irq number starts from 0, but ARM's shared peripheral
+ * interrupt number starts from 32. hypervisor adds offset 32
+ */
+ gzvm_hypcall_wrapper(MT_HVC_GZVM_IRQ_LINE, a1, irq, level,
+ 0, 0, 0, 0, &res);
+ if (res.a0) {
+ pr_err("Failed to set IRQ level (%d) to irq#%u on vcpu %d with ret=%d\n",
+ level, irq, vcpu_idx, (int)res.a0);
+ return -EFAULT;
+ }
+
+ return 0;
+}
diff --git a/drivers/virt/geniezone/gzvm_common.h b/drivers/virt/geniezone/gzvm_common.h
new file mode 100644
index 000000000000..c8d90fee3a18
--- /dev/null
+++ b/drivers/virt/geniezone/gzvm_common.h
@@ -0,0 +1,12 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * Copyright (c) 2023 MediaTek Inc.
+ */
+
+#ifndef __GZ_COMMON_H__
+#define __GZ_COMMON_H__
+
+int gzvm_irqchip_inject_irq(struct gzvm *gzvm, unsigned int vcpu_idx,
+ u32 irq, bool level);
+
+#endif /* __GZVM_COMMON_H__ */
diff --git a/drivers/virt/geniezone/gzvm_vm.c b/drivers/virt/geniezone/gzvm_vm.c
index ab5a96400f3c..8d6b7aebaf3a 100644
--- a/drivers/virt/geniezone/gzvm_vm.c
+++ b/drivers/virt/geniezone/gzvm_vm.c
@@ -11,6 +11,7 @@
#include <linux/platform_device.h>
#include <linux/slab.h>
#include <linux/gzvm_drv.h>
+#include "gzvm_common.h"
static DEFINE_MUTEX(gzvm_list_lock);
static LIST_HEAD(gzvm_list);
@@ -98,6 +99,72 @@ gzvm_vm_ioctl_set_memory_region(struct gzvm *gzvm,
return register_memslot_addr_range(gzvm, memslot);
}
+int gzvm_irqchip_inject_irq(struct gzvm *gzvm, unsigned int vcpu_idx,
+ u32 irq, bool level)
+{
+ return gzvm_arch_inject_irq(gzvm, vcpu_idx, irq, level);
+}
+
+static int gzvm_vm_ioctl_irq_line(struct gzvm *gzvm,
+ struct gzvm_irq_level *irq_level)
+{
+ u32 irq = irq_level->irq;
+ u32 vcpu_idx, vcpu2_idx, irq_num;
+ bool level = irq_level->level;
+
+ vcpu_idx = FIELD_GET(GZVM_IRQ_LINE_VCPU, irq);
+ vcpu2_idx = FIELD_GET(GZVM_IRQ_LINE_VCPU2, irq) * (GZVM_IRQ_VCPU_MASK + 1);
+ irq_num = FIELD_GET(GZVM_IRQ_LINE_NUM, irq);
+
+ return gzvm_irqchip_inject_irq(gzvm, vcpu_idx + vcpu2_idx, irq_num,
+ level);
+}
+
+static int gzvm_vm_ioctl_create_device(struct gzvm *gzvm, void __user *argp)
+{
+ struct gzvm_create_device *gzvm_dev;
+ void *dev_data = NULL;
+ int ret;
+
+ gzvm_dev = (struct gzvm_create_device *)alloc_pages_exact(PAGE_SIZE,
+ GFP_KERNEL);
+ if (!gzvm_dev)
+ return -ENOMEM;
+ if (copy_from_user(gzvm_dev, argp, sizeof(*gzvm_dev))) {
+ ret = -EFAULT;
+ goto err_free_dev;
+ }
+
+ if (gzvm_dev->attr_addr != 0 && gzvm_dev->attr_size != 0) {
+ size_t attr_size = gzvm_dev->attr_size;
+ void __user *attr_addr = (void __user *)gzvm_dev->attr_addr;
+
+ /* Size of device specific data should not be over a page. */
+ if (attr_size > PAGE_SIZE)
+ return -EINVAL;
+
+ dev_data = alloc_pages_exact(attr_size, GFP_KERNEL);
+ if (!dev_data) {
+ ret = -ENOMEM;
+ goto err_free_dev;
+ }
+
+ if (copy_from_user(dev_data, attr_addr, attr_size)) {
+ ret = -EFAULT;
+ goto err_free_dev_data;
+ }
+ gzvm_dev->attr_addr = virt_to_phys(dev_data);
+ }
+
+ ret = gzvm_arch_create_device(gzvm->vm_id, gzvm_dev);
+err_free_dev_data:
+ if (dev_data)
+ free_pages_exact(dev_data, 0);
+err_free_dev:
+ free_pages_exact(gzvm_dev, 0);
+ return ret;
+}
+
static int gzvm_vm_ioctl_enable_cap(struct gzvm *gzvm,
struct gzvm_enable_cap *cap,
void __user *argp)
@@ -132,6 +199,20 @@ static long gzvm_vm_ioctl(struct file *filp, unsigned int ioctl,
ret = gzvm_vm_ioctl_set_memory_region(gzvm, &userspace_mem);
break;
}
+ case GZVM_IRQ_LINE: {
+ struct gzvm_irq_level irq_event;
+
+ if (copy_from_user(&irq_event, argp, sizeof(irq_event))) {
+ ret = -EFAULT;
+ goto out;
+ }
+ ret = gzvm_vm_ioctl_irq_line(gzvm, &irq_event);
+ break;
+ }
+ case GZVM_CREATE_DEVICE: {
+ ret = gzvm_vm_ioctl_create_device(gzvm, argp);
+ break;
+ }
case GZVM_ENABLE_CAP: {
struct gzvm_enable_cap cap;
diff --git a/include/linux/gzvm_drv.h b/include/linux/gzvm_drv.h
index a4203801740c..805a866acecc 100644
--- a/include/linux/gzvm_drv.h
+++ b/include/linux/gzvm_drv.h
@@ -120,4 +120,8 @@ int gzvm_arch_vcpu_run(struct gzvm_vcpu *vcpu, __u64 *exit_reason);
int gzvm_arch_destroy_vcpu(u16 vm_id, int vcpuid);
int gzvm_arch_inform_exit(u16 vm_id);
+int gzvm_arch_create_device(u16 vm_id, struct gzvm_create_device *gzvm_dev);
+int gzvm_arch_inject_irq(struct gzvm *gzvm, unsigned int vcpu_idx,
+ u32 irq, bool level);
+
#endif /* __GZVM_DRV_H__ */
diff --git a/include/uapi/linux/gzvm.h b/include/uapi/linux/gzvm.h
index bdf277fa248a..a1f6acdc4055 100644
--- a/include/uapi/linux/gzvm.h
+++ b/include/uapi/linux/gzvm.h
@@ -99,6 +99,72 @@ struct gzvm_userspace_memory_region {
#define GZVM_SET_USER_MEMORY_REGION _IOW(GZVM_IOC_MAGIC, 0x46, \
struct gzvm_userspace_memory_region)
+/* for GZVM_IRQ_LINE, irq field index values */
+#define GZVM_IRQ_VCPU_MASK 0xff
+#define GZVM_IRQ_LINE_TYPE GENMASK(27, 24)
+#define GZVM_IRQ_LINE_VCPU GENMASK(23, 16)
+#define GZVM_IRQ_LINE_VCPU2 GENMASK(31, 28)
+#define GZVM_IRQ_LINE_NUM GENMASK(15, 0)
+
+/* irq_type field */
+#define GZVM_IRQ_TYPE_CPU 0
+#define GZVM_IRQ_TYPE_SPI 1
+#define GZVM_IRQ_TYPE_PPI 2
+
+/* out-of-kernel GIC cpu interrupt injection irq_number field */
+#define GZVM_IRQ_CPU_IRQ 0
+#define GZVM_IRQ_CPU_FIQ 1
+
+struct gzvm_irq_level {
+ union {
+ __u32 irq;
+ __s32 status;
+ };
+ __u32 level;
+};
+
+#define GZVM_IRQ_LINE _IOW(GZVM_IOC_MAGIC, 0x61, \
+ struct gzvm_irq_level)
+
+enum gzvm_device_type {
+ GZVM_DEV_TYPE_ARM_VGIC_V3_DIST = 0,
+ GZVM_DEV_TYPE_ARM_VGIC_V3_REDIST = 1,
+ GZVM_DEV_TYPE_MAX,
+};
+
+/**
+ * struct gzvm_create_device: For GZVM_CREATE_DEVICE.
+ * @dev_type: Device type.
+ * @id: Device id.
+ * @flags: Bypass to hypervisor to handle them and these are flags of virtual
+ * devices.
+ * @dev_addr: Device ipa address in VM's view.
+ * @dev_reg_size: Device register range size.
+ * @attr_addr: If user -> kernel, this is user virtual address of device
+ * specific attributes (if needed). If kernel->hypervisor,
+ * this is ipa.
+ * @attr_size: This attr_size is the buffer size in bytes of each attribute
+ * needed from various devices. The attribute here refers to the
+ * additional data passed from VMM(e.g. Crosvm) to GenieZone
+ * hypervisor when virtual devices were to be created. Thus,
+ * we need attr_addr and attr_size in the gzvm_create_device
+ * structure to keep track of the attribute mentioned.
+ *
+ * Store information needed to create device.
+ */
+struct gzvm_create_device {
+ __u32 dev_type;
+ __u32 id;
+ __u64 flags;
+ __u64 dev_addr;
+ __u64 dev_reg_size;
+ __u64 attr_addr;
+ __u64 attr_size;
+};
+
+#define GZVM_CREATE_DEVICE _IOWR(GZVM_IOC_MAGIC, 0xe0, \
+ struct gzvm_create_device)
+
/*
* ioctls for vcpu fds
*/
--
2.18.0