[RFC PATCH 14/18] virt/mshv: assert interrupt ioctl
From: Nuno Das Neves
Date: Fri Nov 20 2020 - 19:31:25 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 +++++++++++++++
include/asm-generic/hyperv-tlfs.h | 11 ++++++++
include/uapi/linux/mshv.h | 7 +++++
virt/mshv/mshv_main.c | 36 +++++++++++++++++++++++++
6 files changed, 87 insertions(+), 14 deletions(-)
diff --git a/Documentation/virt/mshv/api.rst b/Documentation/virt/mshv/api.rst
index 95ec77dc73f0..694f978131f9 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 c34a6bb4f457..0de3c2e30a21 100644
--- a/arch/x86/include/asm/hyperv-tlfs.h
+++ b/arch/x86/include/asm/hyperv-tlfs.h
@@ -498,20 +498,6 @@ 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 28917301b6df..5478d4943bfc 100644
--- a/arch/x86/include/uapi/asm/hyperv-tlfs.h
+++ b/arch/x86/include/uapi/asm/hyperv-tlfs.h
@@ -1027,6 +1027,28 @@ 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 {
+ enum hv_interrupt_type interrupt_type;
+ __u32 level_triggered : 1;
+ __u32 logical_dest_mode : 1;
+ __u32 rsvd : 30;
+ };
+ __u64 as_uint64;
+};
#endif
diff --git a/include/asm-generic/hyperv-tlfs.h b/include/asm-generic/hyperv-tlfs.h
index 93571bbab3a6..2cd46241c545 100644
--- a/include/asm-generic/hyperv-tlfs.h
+++ b/include/asm-generic/hyperv-tlfs.h
@@ -164,6 +164,7 @@ 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
@@ -785,4 +786,14 @@ struct hv_install_intercept {
union hv_intercept_parameters intercept_parameter;
};
+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;
+};
+
#endif
diff --git a/include/uapi/linux/mshv.h b/include/uapi/linux/mshv.h
index e784b2d1a3fd..faed9d065bb7 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)
diff --git a/virt/mshv/mshv_main.c b/virt/mshv/mshv_main.c
index 8392d5a45e04..9cf236ade50a 100644
--- a/virt/mshv/mshv_main.c
+++ b/virt/mshv/mshv_main.c
@@ -1189,6 +1189,38 @@ mshv_partition_ioctl_install_intercept(struct mshv_partition *partition,
return ret;
}
+static long
+mshv_partition_ioctl_assert_interrupt(struct mshv_partition *partition,
+ void __user *user_args)
+{
+ struct mshv_assert_interrupt args;
+ int status;
+ unsigned long flags;
+ struct hv_assert_virtual_interrupt *input;
+
+ if (copy_from_user(&args, user_args, sizeof(args)))
+ return -EFAULT;
+
+ 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->control = args.control;
+ input->dest_addr = args.dest_addr;
+ input->vector = args.vector;
+ status = hv_do_hypercall(HVCALL_ASSERT_VIRTUAL_INTERRUPT, input,
+ NULL) & HV_HYPERCALL_RESULT_MASK;
+ local_irq_restore(flags);
+
+ if (status != HV_STATUS_SUCCESS) {
+ pr_err("%s: %s\n", __func__, hv_status_to_string(status));
+ return -hv_status_to_errno(status);
+ }
+
+ return 0;
+}
+
static long
mshv_partition_ioctl(struct file *filp, unsigned int ioctl,
unsigned long arg)
@@ -1216,6 +1248,10 @@ mshv_partition_ioctl(struct file *filp, unsigned int ioctl,
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;
}
--
2.25.1