[PATCH v5 05/12] virt: geniezone: Add irqchip support for virtual interrupt injection
Yi-De Wu
yi-de.wu at mediatek.com
Thu Jul 27 00:59:58 PDT 2023
From: "Yingshiuan Pan" <yingshiuan.pan at mediatek.com>
Enable GenieZone to handle virtual interrupt injection request.
Signed-off-by: Yingshiuan Pan <yingshiuan.pan at mediatek.com>
Signed-off-by: Liju Chen <liju-clr.chen at mediatek.com>
Signed-off-by: Yi-De Wu <yi-de.wu at mediatek.com>
---
arch/arm64/geniezone/Makefile | 2 +-
arch/arm64/geniezone/vgic.c | 108 ++++++++++++++++++++++++
arch/arm64/include/uapi/asm/gzvm_arch.h | 4 +
drivers/virt/geniezone/gzvm_common.h | 12 +++
drivers/virt/geniezone/gzvm_vm.c | 82 ++++++++++++++++++
include/linux/gzvm_drv.h | 4 +
include/uapi/linux/gzvm.h | 66 +++++++++++++++
7 files changed, 277 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/vgic.c b/arch/arm64/geniezone/vgic.c
new file mode 100644
index 000000000000..3746e0c9e247
--- /dev/null
+++ b/arch/arm64/geniezone/vgic.c
@@ -0,0 +1,108 @@
+// 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"
+
+/**
+ * is_irq_valid() - Check the irq number and irq_type are matched
+ * @irq: interrupt number
+ * @irq_type: interrupt type
+ *
+ * Return:
+ * true if irq is valid else false.
+ */
+static bool is_irq_valid(u32 irq, u32 irq_type)
+{
+ switch (irq_type) {
+ case GZVM_IRQ_TYPE_CPU:
+ /* 0 ~ 15: SGI */
+ if (likely(irq <= GZVM_IRQ_CPU_FIQ))
+ return true;
+ break;
+ case GZVM_IRQ_TYPE_PPI:
+ /* 16 ~ 31: PPI */
+ if (likely(irq >= GZVM_VGIC_NR_SGIS &&
+ irq < GZVM_VGIC_NR_PRIVATE_IRQS))
+ return true;
+ break;
+ case GZVM_IRQ_TYPE_SPI:
+ /* 32 ~ : SPT */
+ if (likely(irq >= GZVM_VGIC_NR_PRIVATE_IRQS))
+ return true;
+ break;
+ default:
+ return false;
+ }
+ return false;
+}
+
+/**
+ * gzvm_vgic_inject_irq() - Inject virtual interrupt to a VM
+ * @gzvm: Pointer to struct gzvm
+ * @vcpu_idx: vcpu index, only valid if PPI
+ * @irq_type: Interrupt type
+ * @irq: irq number
+ * @level: 1 if true else 0
+ *
+ * Return:
+ * * 0 - Success.
+ * * Negative - Failure.
+ */
+static int gzvm_vgic_inject_irq(struct gzvm *gzvm, unsigned int vcpu_idx,
+ u32 irq_type, u32 irq, bool level)
+{
+ unsigned long a1 = assemble_vm_vcpu_tuple(gzvm->vm_id, vcpu_idx);
+ struct arm_smccc_res res;
+
+ if (!unlikely(is_irq_valid(irq, irq_type)))
+ return -EINVAL;
+
+ 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;
+}
+
+/**
+ * gzvm_vgic_inject_spi() - Inject virtual spi interrupt
+ * @gzvm: Pointer to struct gzvm
+ * @vcpu_idx: vcpu index
+ * @spi_irq: This is spi interrupt number (starts from 0 instead of 32)
+ * @level: 1 if true else 0
+ *
+ * Return:
+ * * 0 if succeed else other negative values indicating each errors
+ */
+static int gzvm_vgic_inject_spi(struct gzvm *gzvm, unsigned int vcpu_idx,
+ u32 spi_irq, bool level)
+{
+ return gzvm_vgic_inject_irq(gzvm, 0, GZVM_IRQ_TYPE_SPI,
+ spi_irq + GZVM_VGIC_NR_PRIVATE_IRQS,
+ level);
+}
+
+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);
+}
+
+int gzvm_arch_inject_irq(struct gzvm *gzvm, unsigned int vcpu_idx,
+ u32 irq_type, u32 irq, bool level)
+{
+ /* default use spi */
+ return gzvm_vgic_inject_spi(gzvm, vcpu_idx, irq, level);
+}
diff --git a/arch/arm64/include/uapi/asm/gzvm_arch.h b/arch/arm64/include/uapi/asm/gzvm_arch.h
index e56b4700e07e..acfe9be0f849 100644
--- a/arch/arm64/include/uapi/asm/gzvm_arch.h
+++ b/arch/arm64/include/uapi/asm/gzvm_arch.h
@@ -47,4 +47,8 @@
#define GZVM_REG_ARM_CORE_REG(name) \
(offsetof(struct gzvm_regs, name) / sizeof(__u32))
+#define GZVM_VGIC_NR_SGIS 16
+#define GZVM_VGIC_NR_PPIS 16
+#define GZVM_VGIC_NR_PRIVATE_IRQS (GZVM_VGIC_NR_SGIS + GZVM_VGIC_NR_PPIS)
+
#endif /* __GZVM_ARCH_H__ */
diff --git a/drivers/virt/geniezone/gzvm_common.h b/drivers/virt/geniezone/gzvm_common.h
new file mode 100644
index 000000000000..d0e39ded79e6
--- /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_type, 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 aea99d050653..b1397180cd02 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);
@@ -260,6 +261,73 @@ 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_type, u32 irq, bool level)
+{
+ return gzvm_arch_inject_irq(gzvm, vcpu_idx, irq_type, irq, level);
+}
+
+static int gzvm_vm_ioctl_irq_line(struct gzvm *gzvm,
+ struct gzvm_irq_level *irq_level)
+{
+ u32 irq = irq_level->irq;
+ u32 irq_type, vcpu_idx, vcpu2_idx, irq_num;
+ bool level = irq_level->level;
+
+ irq_type = FIELD_GET(GZVM_IRQ_LINE_TYPE, irq);
+ 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_type, 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)
@@ -294,6 +362,20 @@ 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 c42edb4345cc..d86885d46195 100644
--- a/include/linux/gzvm_drv.h
+++ b/include/linux/gzvm_drv.h
@@ -108,4 +108,8 @@ 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_type, u32 irq, bool level);
+
#endif /* __GZVM_DRV_H__ */
diff --git a/include/uapi/linux/gzvm.h b/include/uapi/linux/gzvm.h
index 4814c82b0dff..fb019d232a98 100644
--- a/include/uapi/linux/gzvm.h
+++ b/include/uapi/linux/gzvm.h
@@ -64,6 +64,72 @@ 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
More information about the linux-arm-kernel
mailing list