[PATCH 14/19] drivers/hv: assert interrupt ioctl
From: Nuno Das Neves
Date: Fri May 28 2021 - 18:44:30 EST
Introduce ioctl for asserting an interrupt on a given APIC within a
guest partition.
Co-developed-by: Sunil Muthuswamy <sunilmut@xxxxxxxxxxxxx>
Signed-off-by: Sunil Muthuswamy <sunilmut@xxxxxxxxxxxxx>
Signed-off-by: Nuno Das Neves <nunodasneves@xxxxxxxxxxxxxxxxxxx>
---
Documentation/virt/mshv/api.rst | 11 ++++++++++
arch/x86/include/asm/hyperv-tlfs.h | 14 ------------
arch/x86/include/uapi/asm/hyperv-tlfs.h | 22 +++++++++++++++++++
drivers/hv/hv_call.c | 29 +++++++++++++++++++++++++
drivers/hv/mshv.h | 5 +++++
drivers/hv/mshv_main.c | 20 +++++++++++++++++
include/asm-generic/hyperv-tlfs.h | 11 ++++++++++
include/uapi/linux/mshv.h | 7 ++++++
8 files changed, 105 insertions(+), 14 deletions(-)
diff --git a/Documentation/virt/mshv/api.rst b/Documentation/virt/mshv/api.rst
index f0094258d834..76f98485cd93 100644
--- a/Documentation/virt/mshv/api.rst
+++ b/Documentation/virt/mshv/api.rst
@@ -130,3 +130,14 @@ Enable and configure different types of intercepts. Intercepts are events in a
guest partition that will suspend the guest vp and send a message to the root
partition (returned from MSHV_RUN_VP).
+3.8 MSHV_ASSERT_INTERRUPT
+--------------------------
+:Type: partition ioctl
+:Parameters: struct mshv_assert_interrupt
+:Returns: 0 on success
+
+Assert interrupts in partitions that use Microsoft Hypervisor's internal
+emulated LAPIC. This must be enabled on partition creation with the flag:
+HV_PARTITION_CREATION_FLAG_LAPIC_ENABLED
+
+
diff --git a/arch/x86/include/asm/hyperv-tlfs.h b/arch/x86/include/asm/hyperv-tlfs.h
index 2b6f7dca79e6..871f5d014ae0 100644
--- a/arch/x86/include/asm/hyperv-tlfs.h
+++ b/arch/x86/include/asm/hyperv-tlfs.h
@@ -546,20 +546,6 @@ struct hv_partition_assist_pg {
u32 tlb_lock_count;
};
-enum hv_interrupt_type {
- HV_X64_INTERRUPT_TYPE_FIXED = 0x0000,
- HV_X64_INTERRUPT_TYPE_LOWESTPRIORITY = 0x0001,
- HV_X64_INTERRUPT_TYPE_SMI = 0x0002,
- HV_X64_INTERRUPT_TYPE_REMOTEREAD = 0x0003,
- HV_X64_INTERRUPT_TYPE_NMI = 0x0004,
- HV_X64_INTERRUPT_TYPE_INIT = 0x0005,
- HV_X64_INTERRUPT_TYPE_SIPI = 0x0006,
- HV_X64_INTERRUPT_TYPE_EXTINT = 0x0007,
- HV_X64_INTERRUPT_TYPE_LOCALINT0 = 0x0008,
- HV_X64_INTERRUPT_TYPE_LOCALINT1 = 0x0009,
- HV_X64_INTERRUPT_TYPE_MAXIMUM = 0x000A,
-};
-
#include <asm-generic/hyperv-tlfs.h>
#endif
diff --git a/arch/x86/include/uapi/asm/hyperv-tlfs.h b/arch/x86/include/uapi/asm/hyperv-tlfs.h
index 442c4bb4113e..e234297521a3 100644
--- a/arch/x86/include/uapi/asm/hyperv-tlfs.h
+++ b/arch/x86/include/uapi/asm/hyperv-tlfs.h
@@ -989,6 +989,28 @@ union hv_intercept_parameters {
#define HV_INTERCEPT_ACCESS_MASK_WRITE 0x02
#define HV_INTERCEPT_ACCESS_MASK_EXECUTE 0x04
+enum hv_interrupt_type {
+ HV_X64_INTERRUPT_TYPE_FIXED = 0x0000,
+ HV_X64_INTERRUPT_TYPE_LOWESTPRIORITY = 0x0001,
+ HV_X64_INTERRUPT_TYPE_SMI = 0x0002,
+ HV_X64_INTERRUPT_TYPE_REMOTEREAD = 0x0003,
+ HV_X64_INTERRUPT_TYPE_NMI = 0x0004,
+ HV_X64_INTERRUPT_TYPE_INIT = 0x0005,
+ HV_X64_INTERRUPT_TYPE_SIPI = 0x0006,
+ HV_X64_INTERRUPT_TYPE_EXTINT = 0x0007,
+ HV_X64_INTERRUPT_TYPE_LOCALINT0 = 0x0008,
+ HV_X64_INTERRUPT_TYPE_LOCALINT1 = 0x0009,
+ HV_X64_INTERRUPT_TYPE_MAXIMUM = 0x000A
+};
+union hv_interrupt_control {
+ struct {
+ __u32 interrupt_type; /* enum hv_interrupt type */
+ __u32 level_triggered : 1;
+ __u32 logical_dest_mode : 1;
+ __u32 rsvd : 30;
+ } __packed;
+ __u64 as_uint64;
+};
#endif
diff --git a/drivers/hv/hv_call.c b/drivers/hv/hv_call.c
index cfb1d7d3e75a..9741166fae51 100644
--- a/drivers/hv/hv_call.c
+++ b/drivers/hv/hv_call.c
@@ -434,3 +434,32 @@ int hv_call_install_intercept(
return ret;
}
+int hv_call_assert_virtual_interrupt(
+ u64 partition_id,
+ u32 vector,
+ u64 dest_addr,
+ union hv_interrupt_control control)
+{
+ struct hv_assert_virtual_interrupt *input;
+ unsigned long flags;
+ u64 status;
+
+ local_irq_save(flags);
+ input = (struct hv_assert_virtual_interrupt *)(*this_cpu_ptr(
+ hyperv_pcpu_input_arg));
+ memset(input, 0, sizeof(*input));
+ input->partition_id = partition_id;
+ input->vector = vector;
+ input->dest_addr = dest_addr;
+ input->control = control;
+ status = hv_do_hypercall(HVCALL_ASSERT_VIRTUAL_INTERRUPT, input, NULL);
+ local_irq_restore(flags);
+
+ if (!hv_result_success(status)) {
+ pr_err("%s: %s\n", __func__, hv_status_to_string(status));
+ return hv_status_to_errno(status);
+ }
+
+ return 0;
+}
+
diff --git a/drivers/hv/mshv.h b/drivers/hv/mshv.h
index 541c83a36767..c0a0ccb3626a 100644
--- a/drivers/hv/mshv.h
+++ b/drivers/hv/mshv.h
@@ -67,5 +67,10 @@ int hv_call_set_vp_registers(
int hv_call_install_intercept(u64 partition_id, u32 access_type,
enum hv_intercept_type intercept_type,
union hv_intercept_parameters intercept_parameter);
+int hv_call_assert_virtual_interrupt(
+ u64 partition_id,
+ u32 vector,
+ u64 dest_addr,
+ union hv_interrupt_control control);
#endif /* _MSHV_H */
diff --git a/drivers/hv/mshv_main.c b/drivers/hv/mshv_main.c
index e5d14dc72d94..f62a2886e41f 100644
--- a/drivers/hv/mshv_main.c
+++ b/drivers/hv/mshv_main.c
@@ -573,6 +573,22 @@ mshv_partition_ioctl_install_intercept(struct mshv_partition *partition,
args.intercept_parameter);
}
+static long
+mshv_partition_ioctl_assert_interrupt(struct mshv_partition *partition,
+ void __user *user_args)
+{
+ struct mshv_assert_interrupt args;
+
+ if (copy_from_user(&args, user_args, sizeof(args)))
+ return -EFAULT;
+
+ return hv_call_assert_virtual_interrupt(
+ partition->id,
+ args.vector,
+ args.dest_addr,
+ args.control);
+}
+
static long
mshv_partition_ioctl(struct file *filp, unsigned int ioctl, unsigned long arg)
{
@@ -599,6 +615,10 @@ mshv_partition_ioctl(struct file *filp, unsigned int ioctl, unsigned long arg)
ret = mshv_partition_ioctl_install_intercept(partition,
(void __user *)arg);
break;
+ case MSHV_ASSERT_INTERRUPT:
+ ret = mshv_partition_ioctl_assert_interrupt(partition,
+ (void __user *)arg);
+ break;
default:
ret = -ENOTTY;
}
diff --git a/include/asm-generic/hyperv-tlfs.h b/include/asm-generic/hyperv-tlfs.h
index b8f9c87e432b..7befb2b11f24 100644
--- a/include/asm-generic/hyperv-tlfs.h
+++ b/include/asm-generic/hyperv-tlfs.h
@@ -165,6 +165,7 @@ struct ms_hyperv_tsc_page {
#define HVCALL_MAP_DEVICE_INTERRUPT 0x007c
#define HVCALL_UNMAP_DEVICE_INTERRUPT 0x007d
#define HVCALL_RETARGET_INTERRUPT 0x007e
+#define HVCALL_ASSERT_VIRTUAL_INTERRUPT 0x0094
#define HVCALL_FLUSH_GUEST_PHYSICAL_ADDRESS_SPACE 0x00af
#define HVCALL_FLUSH_GUEST_PHYSICAL_ADDRESS_LIST 0x00b0
@@ -821,4 +822,14 @@ struct hv_install_intercept {
union hv_intercept_parameters intercept_parameter;
} __packed;
+struct hv_assert_virtual_interrupt {
+ u64 partition_id;
+ union hv_interrupt_control control;
+ u64 dest_addr; /* cpu's apic id */
+ u32 vector;
+ u8 target_vtl;
+ u8 rsvd_z0;
+ u16 rsvd_z1;
+} __packed;
+
#endif
diff --git a/include/uapi/linux/mshv.h b/include/uapi/linux/mshv.h
index 8574a4e62715..f65248a1ee89 100644
--- a/include/uapi/linux/mshv.h
+++ b/include/uapi/linux/mshv.h
@@ -47,6 +47,12 @@ struct mshv_install_intercept {
union hv_intercept_parameters intercept_parameter;
};
+struct mshv_assert_interrupt {
+ union hv_interrupt_control control;
+ __u64 dest_addr;
+ __u32 vector;
+};
+
#define MSHV_IOCTL 0xB8
/* mshv device */
@@ -58,6 +64,7 @@ struct mshv_install_intercept {
#define MSHV_UNMAP_GUEST_MEMORY _IOW(MSHV_IOCTL, 0x03, struct mshv_user_mem_region)
#define MSHV_CREATE_VP _IOW(MSHV_IOCTL, 0x04, struct mshv_create_vp)
#define MSHV_INSTALL_INTERCEPT _IOW(MSHV_IOCTL, 0x08, struct mshv_install_intercept)
+#define MSHV_ASSERT_INTERRUPT _IOW(MSHV_IOCTL, 0x09, struct mshv_assert_interrupt)
/* vp device */
#define MSHV_GET_VP_REGISTERS _IOWR(MSHV_IOCTL, 0x05, struct mshv_vp_registers)
--
2.25.1