[PATCH v1 4/6] soc: mediatek: virt: geniezone: Introduce irqchip for virtual interrupt injection
From: Yi-De Wu
Date: Thu Apr 13 2023 - 05:08:48 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: Yi-De Wu <yi-de.wu@xxxxxxxxxxxx>
---
drivers/soc/mediatek/virt/geniezone/Makefile | 2 +-
drivers/soc/mediatek/virt/geniezone/gzvm.h | 5 +
.../mediatek/virt/geniezone/gzvm_irqchip.c | 94 +++++++++++++++++++
.../soc/mediatek/virt/geniezone/gzvm_vcpu.c | 6 ++
drivers/soc/mediatek/virt/geniezone/gzvm_vm.c | 77 +++++++++++++++
include/uapi/linux/gzvm_common.h | 32 +++++++
6 files changed, 215 insertions(+), 1 deletion(-)
create mode 100644 drivers/soc/mediatek/virt/geniezone/gzvm_irqchip.c
diff --git a/drivers/soc/mediatek/virt/geniezone/Makefile b/drivers/soc/mediatek/virt/geniezone/Makefile
index e1dfbb9c568d..d2302a3a93fc 100644
--- a/drivers/soc/mediatek/virt/geniezone/Makefile
+++ b/drivers/soc/mediatek/virt/geniezone/Makefile
@@ -1,5 +1,5 @@
# SPDX-License-Identifier: GPL-2.0-only
-gzvm-y := gzvm_main.o gzvm_vm.o gzvm_vcpu.o
+gzvm-y := gzvm_main.o gzvm_vm.o gzvm_vcpu.o gzvm_irqchip.o
obj-$(CONFIG_MTK_GZVM) += gzvm.o
diff --git a/drivers/soc/mediatek/virt/geniezone/gzvm.h b/drivers/soc/mediatek/virt/geniezone/gzvm.h
index 43f215d4b0da..89cea5441a2d 100644
--- a/drivers/soc/mediatek/virt/geniezone/gzvm.h
+++ b/drivers/soc/mediatek/virt/geniezone/gzvm.h
@@ -98,6 +98,11 @@ int gzvm_hypcall_wrapper(unsigned long a0, unsigned long a1, unsigned long a2,
#define MT_HVC_GZVM_PROBE GZVM_HCALL_ID(GZVM_FUNC_PROBE)
#define MT_HVC_GZVM_ENABLE_CAP GZVM_HCALL_ID(GZVM_FUNC_ENABLE_CAP)
+void gzvm_sync_vgic_state(struct gzvm_vcpu *vcpu);
+int gzvm_vgic_inject_irq(struct gzvm *gzvm, unsigned int vcpu_idx, u32 irq_type,
+ u32 irq, bool level);
+int gzvm_vgic_inject_spi(struct gzvm *gzvm, unsigned int vcpu_idx,
+ u32 spi_irq, bool level);
int gz_err_to_errno(unsigned long err);
#endif /* __GZVM_H__ */
diff --git a/drivers/soc/mediatek/virt/geniezone/gzvm_irqchip.c b/drivers/soc/mediatek/virt/geniezone/gzvm_irqchip.c
new file mode 100644
index 000000000000..7aa5868a221c
--- /dev/null
+++ b/drivers/soc/mediatek/virt/geniezone/gzvm_irqchip.c
@@ -0,0 +1,94 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (c) 2023 MediaTek Inc.
+ */
+
+#include <linux/irqchip/arm-gic-v3.h>
+#include <kvm/arm_vgic.h>
+
+#include "gzvm.h"
+
+/**
+ * @brief check all LRs synced from gz hypervisor
+ * Traverse all LRs, see if any EOIed vint, notify_acked_irq if any.
+ * GZ does not fold/unfold everytime KVM_RUN, so we have to traverse all saved
+ * LRs. It will not takes much more time comparing to fold/unfold everytime
+ * GZVM_RUN, because there are only few LRs.
+ */
+void gzvm_sync_vgic_state(struct gzvm_vcpu *vcpu)
+{
+ int i;
+
+ for (i = 0; i < vcpu->hwstate->nr_lrs; i++) {
+ uint64_t lr_val = vcpu->hwstate->lr[i];
+ /* 0 means unused */
+ if (!lr_val)
+ continue;
+ }
+}
+
+/**
+ * @brief Check the irq number and irq_type are matched
+ */
+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 >= VGIC_NR_SGIS && irq < VGIC_NR_PRIVATE_IRQS))
+ return true;
+ break;
+ case GZVM_IRQ_TYPE_SPI: /* 32 ~ : SPT */
+ if (likely(irq >= VGIC_NR_PRIVATE_IRQS))
+ return true;
+ break;
+ default:
+ return false;
+ }
+ return false;
+}
+
+/**
+ * @brief Inject virtual interrupt to a VM
+ *
+ * @param gzvm
+ * @param vcpu_idx: vcpu index, only valid if PPI
+ * @param irq: irq number
+ * @param irq_type
+ * @param level, true: 1; false: 0
+ */
+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;
+}
+
+/**
+ * @brief Inject virtual spi interrupt
+ *
+ * @param spi_irq This is spi interrupt number (starts from 0 instead of 32)
+ * @return 0 succeed, other negative values are error
+ */
+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 + VGIC_NR_PRIVATE_IRQS, level);
+}
diff --git a/drivers/soc/mediatek/virt/geniezone/gzvm_vcpu.c b/drivers/soc/mediatek/virt/geniezone/gzvm_vcpu.c
index 726db866dfcf..5f2e24d13c41 100644
--- a/drivers/soc/mediatek/virt/geniezone/gzvm_vcpu.c
+++ b/drivers/soc/mediatek/virt/geniezone/gzvm_vcpu.c
@@ -67,6 +67,11 @@ static long gzvm_vcpu_update_one_reg(struct gzvm_vcpu *vcpu, void * __user argp,
return ret;
}
+static void gzvm_sync_hwstate(struct gzvm_vcpu *vcpu)
+{
+ gzvm_sync_vgic_state(vcpu);
+}
+
/**
* @brief Handle vcpu run ioctl, entry point to guest and exit point from guest
*
@@ -115,6 +120,7 @@ static long gzvm_vcpu_run(struct gzvm_vcpu *vcpu, void * __user argp)
need_userspace = true;
goto out;
}
+ gzvm_sync_hwstate(vcpu);
} while (!need_userspace);
out:
diff --git a/drivers/soc/mediatek/virt/geniezone/gzvm_vm.c b/drivers/soc/mediatek/virt/geniezone/gzvm_vm.c
index df4ccdc3b7f0..7895f40b23eb 100644
--- a/drivers/soc/mediatek/virt/geniezone/gzvm_vm.c
+++ b/drivers/soc/mediatek/virt/geniezone/gzvm_vm.c
@@ -193,6 +193,69 @@ static int gzvm_vm_ioctl_set_memory_region(struct gzvm *gzvm,
return register_memslot_addr_range(gzvm, memslot);
}
+static int gzvm_vm_ioctl_irq_line(struct gzvm *gzvm,
+ struct gzvm_irq_level *irq_level)
+{
+ u32 irq = irq_level->irq;
+ unsigned int irq_type, vcpu_idx, irq_num;
+ bool level = irq_level->level;
+
+ irq_type = (irq >> GZVM_IRQ_TYPE_SHIFT) & GZVM_IRQ_TYPE_MASK;
+ vcpu_idx = (irq >> GZVM_IRQ_VCPU_SHIFT) & GZVM_IRQ_VCPU_MASK;
+ vcpu_idx += ((irq >> GZVM_IRQ_VCPU2_SHIFT) & GZVM_IRQ_VCPU2_MASK) *
+ (GZVM_IRQ_VCPU_MASK + 1);
+ irq_num = (irq >> GZVM_IRQ_NUM_SHIFT) & GZVM_IRQ_NUM_MASK;
+
+ return gzvm_vgic_inject_irq(gzvm, vcpu_idx, irq_num, irq_type, level);
+}
+
+static int gzvm_vm_ioctl_create_device(struct gzvm *gzvm, void __user *argp)
+{
+ struct gzvm_create_device *gzvm_dev;
+ void *dev_data = NULL;
+ struct arm_smccc_res res = {0};
+ 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_hypcall_wrapper(MT_HVC_GZVM_CREATE_DEVICE, gzvm->vm_id,
+ virt_to_phys(gzvm_dev), 0, 0, 0, 0, 0, &res);
+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_enable_cap_hyp(struct gzvm *gzvm,
struct gzvm_enable_cap *cap,
struct arm_smccc_res *res)
@@ -300,6 +363,20 @@ 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;
+
+ ret = -EFAULT;
+ if (copy_from_user(&irq_event, argp, sizeof(irq_event)))
+ 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/uapi/linux/gzvm_common.h b/include/uapi/linux/gzvm_common.h
index aa97438bab8c..6808cfe59450 100644
--- a/include/uapi/linux/gzvm_common.h
+++ b/include/uapi/linux/gzvm_common.h
@@ -183,6 +183,38 @@ struct gzvm_userspace_memory_region {
#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,
+ GZVM_DEV_TYPE_ARM_VGIC_V3_REDIST,
+ GZVM_DEV_TYPE_MAX,
+};
+
+struct gzvm_create_device {
+ __u32 dev_type; /* device type */
+ __u32 id; /* out: device id */
+ __u64 flags; /* device specific flags */
+ __u64 dev_addr; /* device ipa address in VM's view */
+ __u64 dev_reg_size; /* device register range size */
+ /*
+ * If user -> kernel, this is user virtual address of device specific
+ * attributes (if needed). If kernel->hypervisor, this is ipa.
+ */
+ __u64 attr_addr;
+ __u64 attr_size; /* size of device specific attributes */
+};
+#define GZVM_CREATE_DEVICE _IOWR(GZVM_IOC_MAGIC, 0xe0, \
+ struct gzvm_create_device)
+
/*
* ioctls for vcpu fds
*/
--
2.18.0