@@ -19,6 +19,7 @@
#include <asm/inst.h>
#include <asm/kvm_mmu.h>
#include <asm/loongarch.h>
+#include <asm/kvm_ipi.h>
/* Loongarch KVM register ids */
#define KVM_GET_IOC_CSR_IDX(id) ((id & KVM_CSR_IDX_MASK) >> LOONGARCH_REG_SHIFT)
@@ -107,6 +108,7 @@ struct kvm_arch {
s64 time_offset;
struct kvm_context __percpu *vmcs;
+ struct loongarch_ipi *ipi;
};
#define CSR_MAX_NUMS 0x800
@@ -199,6 +201,8 @@ struct kvm_vcpu_arch {
int last_sched_cpu;
/* mp state */
struct kvm_mp_state mp_state;
+ /* ipi state */
+ struct ipi_state ipi_state;
/* cpucfg */
u32 cpucfg[KVM_MAX_CPUCFG_REGS];
};
new file mode 100644
@@ -0,0 +1,36 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * Copyright (C) 2024 Loongson Technology Corporation Limited
+ */
+
+#ifndef __LS3A_KVM_IPI_H
+#define __LS3A_KVM_IPI_H
+
+#include <kvm/iodev.h>
+
+#define LARCH_INT_IPI 12
+
+struct loongarch_ipi {
+ spinlock_t lock;
+ struct kvm *kvm;
+ struct kvm_io_device device;
+ struct kvm_io_device mail_dev;
+};
+
+struct ipi_state {
+ spinlock_t lock;
+ uint32_t status;
+ uint32_t en;
+ uint32_t set;
+ uint32_t clear;
+ uint64_t buf[4];
+};
+
+#define SMP_MAILBOX 0x1000
+#define KVM_IOCSR_IPI_ADDR_SIZE 0x48
+
+#define MAIL_SEND_ADDR (SMP_MAILBOX + IOCSR_MAIL_SEND)
+#define KVM_IOCSR_MAIL_ADDR_SIZE 0x118
+
+int kvm_loongarch_register_ipi_device(void);
+#endif
@@ -18,5 +18,6 @@ kvm-y += timer.o
kvm-y += tlb.o
kvm-y += vcpu.o
kvm-y += vm.o
+kvm-y += intc/ipi.o
CFLAGS_exit.o += $(call cc-option,-Wno-override-init,)
new file mode 100644
@@ -0,0 +1,155 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (C) 2024 Loongson Technology Corporation Limited
+ */
+
+#include <linux/kvm_host.h>
+#include <asm/kvm_ipi.h>
+#include <asm/kvm_vcpu.h>
+
+static int kvm_loongarch_ipi_write(struct kvm_vcpu *vcpu,
+ struct kvm_io_device *dev,
+ gpa_t addr, int len, const void *val)
+{
+ return 0;
+}
+
+static int kvm_loongarch_ipi_read(struct kvm_vcpu *vcpu,
+ struct kvm_io_device *dev,
+ gpa_t addr, int len, void *val)
+{
+ return 0;
+}
+
+static int kvm_loongarch_mail_write(struct kvm_vcpu *vcpu,
+ struct kvm_io_device *dev,
+ gpa_t addr, int len, const void *val)
+{
+ return 0;
+}
+
+static const struct kvm_io_device_ops kvm_loongarch_ipi_ops = {
+ .read = kvm_loongarch_ipi_read,
+ .write = kvm_loongarch_ipi_write,
+};
+
+static const struct kvm_io_device_ops kvm_loongarch_mail_ops = {
+ .write = kvm_loongarch_mail_write,
+};
+
+static int kvm_loongarch_ipi_get_attr(struct kvm_device *dev,
+ struct kvm_device_attr *attr)
+{
+ return 0;
+}
+
+static int kvm_loongarch_ipi_set_attr(struct kvm_device *dev,
+ struct kvm_device_attr *attr)
+{
+ return 0;
+}
+
+static void kvm_loongarch_ipi_destroy(struct kvm_device *dev)
+{
+ struct kvm *kvm;
+ struct loongarch_ipi *ipi;
+ struct kvm_io_device *device;
+
+ if (!dev)
+ return;
+
+ kvm = dev->kvm;
+ if (!kvm)
+ return;
+
+ ipi = kvm->arch.ipi;
+ if (!ipi)
+ return;
+
+ device = &ipi->device;
+ kvm_io_bus_unregister_dev(kvm, KVM_IOCSR_BUS, device);
+
+ device = &ipi->mail_dev;
+ kvm_io_bus_unregister_dev(kvm, KVM_IOCSR_BUS, device);
+
+ kfree(ipi);
+}
+
+static int kvm_loongarch_ipi_create(struct kvm_device *dev, u32 type)
+{
+ struct kvm *kvm;
+ struct loongarch_ipi *s;
+ unsigned long addr;
+ struct kvm_io_device *device;
+ int ret;
+
+ kvm_info("begin create loongarch ipi in kvm ...\n");
+ if (!dev) {
+ kvm_err("%s: kvm_device ptr is invalid!\n", __func__);
+ return -EINVAL;
+ }
+
+ kvm = dev->kvm;
+ if (kvm->arch.ipi) {
+ kvm_err("%s: loongarch ipi has been created!\n", __func__);
+ return -EINVAL;
+ }
+
+ s = kzalloc(sizeof(struct loongarch_ipi), GFP_KERNEL);
+ if (!s)
+ return -ENOMEM;
+ spin_lock_init(&s->lock);
+ s->kvm = kvm;
+
+ /*
+ * Initialize IOCSR device
+ */
+ device = &s->device;
+ kvm_iodevice_init(device, &kvm_loongarch_ipi_ops);
+ addr = SMP_MAILBOX;
+ mutex_lock(&kvm->slots_lock);
+ ret = kvm_io_bus_register_dev(kvm, KVM_IOCSR_BUS, addr,
+ KVM_IOCSR_IPI_ADDR_SIZE, device);
+ mutex_unlock(&kvm->slots_lock);
+ if (ret < 0) {
+ kvm_err("%s: initialize IOCSR dev failed, ret = %d\n", __func__, ret);
+ goto err;
+ }
+
+ device = &s->mail_dev;
+ kvm_iodevice_init(device, &kvm_loongarch_mail_ops);
+ addr = MAIL_SEND_ADDR;
+ mutex_lock(&kvm->slots_lock);
+ ret = kvm_io_bus_register_dev(kvm, KVM_IOCSR_BUS, addr,
+ KVM_IOCSR_MAIL_ADDR_SIZE, device);
+ mutex_unlock(&kvm->slots_lock);
+ if (ret < 0) {
+ device = &s->device;
+ kvm_io_bus_unregister_dev(kvm, KVM_IOCSR_BUS, device);
+ kvm_err("%s: initialize mail box dev failed, ret = %d\n", __func__, ret);
+ goto err;
+ }
+
+ kvm->arch.ipi = s;
+ kvm_info("create loongarch ipi in kvm done!\n");
+
+ return 0;
+
+err:
+ kfree(s);
+ return -EFAULT;
+}
+
+static struct kvm_device_ops kvm_loongarch_ipi_dev_ops = {
+ .name = "kvm-loongarch-ipi",
+ .create = kvm_loongarch_ipi_create,
+ .destroy = kvm_loongarch_ipi_destroy,
+ .set_attr = kvm_loongarch_ipi_set_attr,
+ .get_attr = kvm_loongarch_ipi_get_attr,
+};
+
+int kvm_loongarch_register_ipi_device(void)
+{
+ return kvm_register_device_ops(&kvm_loongarch_ipi_dev_ops,
+ KVM_DEV_TYPE_LA_IPI);
+}
@@ -312,7 +312,7 @@ void kvm_arch_hardware_disable(void)
static int kvm_loongarch_env_init(void)
{
- int cpu, order;
+ int cpu, order, ret;
void *addr;
struct kvm_context *context;
@@ -367,6 +367,11 @@ static int kvm_loongarch_env_init(void)
kvm_init_gcsr_flag();
+ /* Register loongarch ipi interrupt controller interface. */
+ ret = kvm_loongarch_register_ipi_device();
+ if (ret)
+ return ret;
+
return 0;
}
@@ -1013,6 +1013,9 @@ int kvm_arch_vcpu_create(struct kvm_vcpu *vcpu)
/* Init */
vcpu->arch.last_sched_cpu = -1;
+ /* Init ipi_state lock */
+ spin_lock_init(&vcpu->arch.ipi_state.lock);
+
/*
* Initialize guest register state to valid architectural reset state.
*/
@@ -1142,7 +1142,11 @@ enum kvm_device_type {
#define KVM_DEV_TYPE_ARM_PV_TIME KVM_DEV_TYPE_ARM_PV_TIME
KVM_DEV_TYPE_RISCV_AIA,
#define KVM_DEV_TYPE_RISCV_AIA KVM_DEV_TYPE_RISCV_AIA
+ KVM_DEV_TYPE_LA_IPI,
+#define KVM_DEV_TYPE_LA_IPI KVM_DEV_TYPE_LA_IPI
+
KVM_DEV_TYPE_MAX,
+
};
struct kvm_vfio_spapr_tce {