[PATCH v3 13/19] drivers/hv: install intercept ioctl
From: Nuno Das Neves
Date: Tue Sep 28 2021 - 14:31:57 EST
Introduce ioctl for configuring intercept messages from a guest partition.
Signed-off-by: Nuno Das Neves <nunodasneves@xxxxxxxxxxxxxxxxxxx>
---
Documentation/virt/mshv/api.rst | 9 ++++++
arch/x86/include/uapi/asm/hyperv-tlfs.h | 43 +++++++++++++++++++++++++
drivers/hv/hv_call.c | 38 ++++++++++++++++++++++
drivers/hv/mshv.h | 3 ++
drivers/hv/mshv_main.c | 20 ++++++++++++
include/asm-generic/hyperv-tlfs.h | 8 +++++
include/uapi/linux/mshv.h | 7 ++++
7 files changed, 128 insertions(+)
diff --git a/Documentation/virt/mshv/api.rst b/Documentation/virt/mshv/api.rst
index 9deddcd7de54..f0094258d834 100644
--- a/Documentation/virt/mshv/api.rst
+++ b/Documentation/virt/mshv/api.rst
@@ -120,4 +120,13 @@ This ioctl will fail on any vp that's already running (not suspended).
Information about the intercept is returned in the hv_message struct.
+3.7 MSHV_INSTALL_INTERCEPT
+--------------------------
+:Type: partition ioctl
+:Parameters: struct mshv_install_intercept
+:Returns: 0 on success
+
+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).
diff --git a/arch/x86/include/uapi/asm/hyperv-tlfs.h b/arch/x86/include/uapi/asm/hyperv-tlfs.h
index 4ffa7e1cd185..442c4bb4113e 100644
--- a/arch/x86/include/uapi/asm/hyperv-tlfs.h
+++ b/arch/x86/include/uapi/asm/hyperv-tlfs.h
@@ -948,4 +948,47 @@ struct hv_x64_apic_eoi_message {
__u32 interrupt_vector;
} __packed;
+enum hv_intercept_type {
+ HV_INTERCEPT_TYPE_X64_IO_PORT = 0X00000000,
+ HV_INTERCEPT_TYPE_X64_MSR = 0X00000001,
+ HV_INTERCEPT_TYPE_X64_CPUID = 0X00000002,
+ HV_INTERCEPT_TYPE_EXCEPTION = 0X00000003,
+ HV_INTERCEPT_TYPE_REGISTER = 0X00000004,
+ HV_INTERCEPT_TYPE_MMIO = 0X00000005,
+ HV_INTERCEPT_TYPE_X64_GLOBAL_CPUID = 0X00000006,
+ HV_INTERCEPT_TYPE_X64_APIC_SMI = 0X00000007,
+ HV_INTERCEPT_TYPE_HYPERCALL = 0X00000008,
+ HV_INTERCEPT_TYPE_X64_APIC_INIT_SIPI = 0X00000009,
+ HV_INTERCEPT_MC_UPDATE_PATCH_LEVEL_MSR_READ = 0X0000000A,
+ HV_INTERCEPT_TYPE_X64_APIC_WRITE = 0X0000000B,
+ HV_INTERCEPT_TYPE_MAX,
+ HV_INTERCEPT_TYPE_INVALID = 0XFFFFFFFF,
+};
+
+union hv_intercept_parameters {
+ __u64 as_uint64;
+
+ /* hv_intercept_type_x64_io_port */
+ __u16 io_port;
+
+ /* hv_intercept_type_x64_cpuid */
+ __u32 cpuid_index;
+
+ /* hv_intercept_type_x64_apic_write */
+ __u32 apic_write_mask;
+
+ /* hv_intercept_type_exception */
+ __u16 exception_vector;
+
+ /* N.B. Other intercept types do not have any parameters. */
+};
+
+/* Access types for the install intercept hypercall parameter */
+#define HV_INTERCEPT_ACCESS_MASK_NONE 0x00
+#define HV_INTERCEPT_ACCESS_MASK_READ 0X01
+#define HV_INTERCEPT_ACCESS_MASK_WRITE 0x02
+#define HV_INTERCEPT_ACCESS_MASK_EXECUTE 0x04
+
+
+
#endif
diff --git a/drivers/hv/hv_call.c b/drivers/hv/hv_call.c
index 37dcd6c636a7..ec71b5a08a76 100644
--- a/drivers/hv/hv_call.c
+++ b/drivers/hv/hv_call.c
@@ -394,3 +394,41 @@ int hv_call_set_vp_registers(
return hv_status_to_errno(status);
}
+int hv_call_install_intercept(
+ u64 partition_id,
+ u32 access_type,
+ enum hv_intercept_type intercept_type,
+ union hv_intercept_parameters intercept_parameter)
+{
+ struct hv_install_intercept *input;
+ unsigned long flags;
+ u64 status;
+ int ret;
+
+ do {
+ local_irq_save(flags);
+ input = (struct hv_install_intercept *)(*this_cpu_ptr(
+ hyperv_pcpu_input_arg));
+ input->partition_id = partition_id;
+ input->access_type = access_type;
+ input->intercept_type = intercept_type;
+ input->intercept_parameter = intercept_parameter;
+ status = hv_do_hypercall(
+ HVCALL_INSTALL_INTERCEPT, input, NULL);
+
+ local_irq_restore(flags);
+ if (hv_result(status) != HV_STATUS_INSUFFICIENT_MEMORY) {
+ if (!hv_result_success(status))
+ pr_err("%s: %s\n", __func__,
+ hv_status_to_string(status));
+ ret = hv_status_to_errno(status);
+ break;
+ }
+
+ ret = hv_call_deposit_pages(NUMA_NO_NODE, partition_id, 1);
+
+ } while (!ret);
+
+ return ret;
+}
+
diff --git a/drivers/hv/mshv.h b/drivers/hv/mshv.h
index 014352a11190..541c83a36767 100644
--- a/drivers/hv/mshv.h
+++ b/drivers/hv/mshv.h
@@ -64,5 +64,8 @@ int hv_call_set_vp_registers(
u64 partition_id,
u16 count,
struct hv_register_assoc *registers);
+int hv_call_install_intercept(u64 partition_id, u32 access_type,
+ enum hv_intercept_type intercept_type,
+ union hv_intercept_parameters intercept_parameter);
#endif /* _MSHV_H */
diff --git a/drivers/hv/mshv_main.c b/drivers/hv/mshv_main.c
index 390ccf893dd1..911dfc61e24c 100644
--- a/drivers/hv/mshv_main.c
+++ b/drivers/hv/mshv_main.c
@@ -567,6 +567,22 @@ mshv_partition_ioctl_unmap_memory(struct mshv_partition *partition,
return 0;
}
+static long
+mshv_partition_ioctl_install_intercept(struct mshv_partition *partition,
+ void __user *user_args)
+{
+ struct mshv_install_intercept args;
+
+ if (copy_from_user(&args, user_args, sizeof(args)))
+ return -EFAULT;
+
+ return hv_call_install_intercept(
+ partition->id,
+ args.access_type_mask,
+ args.intercept_type,
+ args.intercept_parameter);
+}
+
static long
mshv_partition_ioctl(struct file *filp, unsigned int ioctl, unsigned long arg)
{
@@ -589,6 +605,10 @@ mshv_partition_ioctl(struct file *filp, unsigned int ioctl, unsigned long arg)
ret = mshv_partition_ioctl_create_vp(partition,
(void __user *)arg);
break;
+ case MSHV_INSTALL_INTERCEPT:
+ ret = mshv_partition_ioctl_install_intercept(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 ace8fca88f66..4453ba4d3293 100644
--- a/include/asm-generic/hyperv-tlfs.h
+++ b/include/asm-generic/hyperv-tlfs.h
@@ -152,6 +152,7 @@ struct ms_hyperv_tsc_page {
#define HVCALL_WITHDRAW_MEMORY 0x0049
#define HVCALL_MAP_GPA_PAGES 0x004b
#define HVCALL_UNMAP_GPA_PAGES 0x004c
+#define HVCALL_INSTALL_INTERCEPT 0x004d
#define HVCALL_CREATE_VP 0x004e
#define HVCALL_GET_VP_REGISTERS 0x0050
#define HVCALL_SET_VP_REGISTERS 0x0051
@@ -813,4 +814,11 @@ struct hv_unmap_gpa_pages {
u32 padding;
} __packed;
+struct hv_install_intercept {
+ u64 partition_id;
+ u32 access_type; /* mask */
+ u32 intercept_type;
+ union hv_intercept_parameters intercept_parameter;
+} __packed;
+
#endif
diff --git a/include/uapi/linux/mshv.h b/include/uapi/linux/mshv.h
index 229abac9502f..8574a4e62715 100644
--- a/include/uapi/linux/mshv.h
+++ b/include/uapi/linux/mshv.h
@@ -41,6 +41,12 @@ struct mshv_vp_registers {
struct hv_register_assoc *regs;
};
+struct mshv_install_intercept {
+ __u32 access_type_mask;
+ enum hv_intercept_type intercept_type;
+ union hv_intercept_parameters intercept_parameter;
+};
+
#define MSHV_IOCTL 0xB8
/* mshv device */
@@ -51,6 +57,7 @@ struct mshv_vp_registers {
#define MSHV_MAP_GUEST_MEMORY _IOW(MSHV_IOCTL, 0x02, struct mshv_user_mem_region)
#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)
/* vp device */
#define MSHV_GET_VP_REGISTERS _IOWR(MSHV_IOCTL, 0x05, struct mshv_vp_registers)
--
2.23.4