[RFC PATCH 11/18] virt/mshv: set up synic pages for intercept messages
From: Nuno Das Neves
Date: Fri Nov 20 2020 - 19:31:16 EST
Same idea as synic setup in drivers/hv/hv.c:hv_synic_enable_regs()
and hv_synic_disable_regs().
Setting up synic registers in both vmbus driver and mshv would clobber
them, but the vmbus driver will not run in the root partition, so this
is safe.
Co-developed-by: Lillian Grassin-Drake <ligrassi@xxxxxxxxxxxxx>
Signed-off-by: Lillian Grassin-Drake <ligrassi@xxxxxxxxxxxxx>
Signed-off-by: Nuno Das Neves <nunodasneves@xxxxxxxxxxxxxxxxxxx>
---
arch/x86/include/asm/hyperv-tlfs.h | 29 ---
arch/x86/include/uapi/asm/hyperv-tlfs.h | 264 ++++++++++++++++++++++++
include/asm-generic/hyperv-tlfs.h | 46 +----
include/linux/mshv.h | 1 +
include/uapi/asm-generic/hyperv-tlfs.h | 43 ++++
virt/mshv/mshv_main.c | 98 ++++++++-
6 files changed, 404 insertions(+), 77 deletions(-)
diff --git a/arch/x86/include/asm/hyperv-tlfs.h b/arch/x86/include/asm/hyperv-tlfs.h
index 4cd44ae9bffb..c34a6bb4f457 100644
--- a/arch/x86/include/asm/hyperv-tlfs.h
+++ b/arch/x86/include/asm/hyperv-tlfs.h
@@ -267,35 +267,6 @@ struct hv_tsc_emulation_status {
#define HV_X64_MSR_TSC_REFERENCE_ENABLE 0x00000001
#define HV_X64_MSR_TSC_REFERENCE_ADDRESS_SHIFT 12
-
-/* Define hypervisor message types. */
-enum hv_message_type {
- HVMSG_NONE = 0x00000000,
-
- /* Memory access messages. */
- HVMSG_UNMAPPED_GPA = 0x80000000,
- HVMSG_GPA_INTERCEPT = 0x80000001,
-
- /* Timer notification messages. */
- HVMSG_TIMER_EXPIRED = 0x80000010,
-
- /* Error messages. */
- HVMSG_INVALID_VP_REGISTER_VALUE = 0x80000020,
- HVMSG_UNRECOVERABLE_EXCEPTION = 0x80000021,
- HVMSG_UNSUPPORTED_FEATURE = 0x80000022,
-
- /* Trace buffer complete messages. */
- HVMSG_EVENTLOG_BUFFERCOMPLETE = 0x80000040,
-
- /* Platform-specific processor intercept messages. */
- HVMSG_X64_IOPORT_INTERCEPT = 0x80010000,
- HVMSG_X64_MSR_INTERCEPT = 0x80010001,
- HVMSG_X64_CPUID_INTERCEPT = 0x80010002,
- HVMSG_X64_EXCEPTION_INTERCEPT = 0x80010003,
- HVMSG_X64_APIC_EOI = 0x80010004,
- HVMSG_X64_LEGACY_FP_ERROR = 0x80010005
-};
-
struct hv_nested_enlightenments_control {
struct {
__u32 directhypercall:1;
diff --git a/arch/x86/include/uapi/asm/hyperv-tlfs.h b/arch/x86/include/uapi/asm/hyperv-tlfs.h
index 2ff655962738..c6a27053f791 100644
--- a/arch/x86/include/uapi/asm/hyperv-tlfs.h
+++ b/arch/x86/include/uapi/asm/hyperv-tlfs.h
@@ -722,4 +722,268 @@ union hv_register_value {
pending_virtualization_fault_event;
};
+/* Define hypervisor message types. */
+enum hv_message_type {
+ HVMSG_NONE = 0x00000000,
+
+ /* Memory access messages. */
+ HVMSG_UNMAPPED_GPA = 0x80000000,
+ HVMSG_GPA_INTERCEPT = 0x80000001,
+
+ /* Timer notification messages. */
+ HVMSG_TIMER_EXPIRED = 0x80000010,
+
+ /* Error messages. */
+ HVMSG_INVALID_VP_REGISTER_VALUE = 0x80000020,
+ HVMSG_UNRECOVERABLE_EXCEPTION = 0x80000021,
+ HVMSG_UNSUPPORTED_FEATURE = 0x80000022,
+
+ /* Trace buffer complete messages. */
+ HVMSG_EVENTLOG_BUFFERCOMPLETE = 0x80000040,
+
+ /* Platform-specific processor intercept messages. */
+ HVMSG_X64_IO_PORT_INTERCEPT = 0x80010000,
+ HVMSG_X64_MSR_INTERCEPT = 0x80010001,
+ HVMSG_X64_CPUID_INTERCEPT = 0x80010002,
+ HVMSG_X64_EXCEPTION_INTERCEPT = 0x80010003,
+ HVMSG_X64_APIC_EOI = 0x80010004,
+ HVMSG_X64_LEGACY_FP_ERROR = 0x80010005,
+ HVMSG_X64_IOMMU_PRQ = 0x80010006,
+ HVMSG_X64_HALT = 0x80010007,
+ HVMSG_X64_INTERRUPTION_DELIVERABLE = 0x80010008,
+ HVMSG_X64_SIPI_INTERCEPT = 0x80010009,
+};
+
+
+union hv_x64_vp_execution_state {
+ __u16 as_uint16;
+ struct {
+ __u16 cpl:2;
+ __u16 cr0_pe:1;
+ __u16 cr0_am:1;
+ __u16 efer_lma:1;
+ __u16 debug_active:1;
+ __u16 interruption_pending:1;
+ __u16 vtl:4;
+ __u16 enclave_mode:1;
+ __u16 interrupt_shadow:1;
+ __u16 virtualization_fault_active:1;
+ __u16 reserved:2;
+ };
+};
+
+/* Values for intercept_access_type field */
+#define HV_INTERCEPT_ACCESS_READ 0
+#define HV_INTERCEPT_ACCESS_WRITE 1
+#define HV_INTERCEPT_ACCESS_EXECUTE 2
+
+struct hv_x64_intercept_message_header {
+ __u32 vp_index;
+ __u8 instruction_length:4;
+ __u8 cr8:4; // only set for exo partitions
+ __u8 intercept_access_type;
+ union hv_x64_vp_execution_state execution_state;
+ struct hv_x64_segment_register cs_segment;
+ __u64 rip;
+ __u64 rflags;
+};
+
+#define HV_HYPERCALL_INTERCEPT_MAX_XMM_REGISTERS 6
+
+struct hv_x64_hypercall_intercept_message {
+ struct hv_x64_intercept_message_header header;
+ __u64 rax;
+ __u64 rbx;
+ __u64 rcx;
+ __u64 rdx;
+ __u64 r8;
+ __u64 rsi;
+ __u64 rdi;
+ struct hv_u128 xmmregisters[HV_HYPERCALL_INTERCEPT_MAX_XMM_REGISTERS];
+ struct {
+ __u32 isolated:1;
+ __u32 reserved:31;
+ };
+};
+
+union hv_x64_register_access_info {
+ union hv_register_value source_value;
+ enum hv_register_name destination_register;
+ __u64 source_address;
+ __u64 destination_address;
+};
+
+struct hv_x64_register_intercept_message {
+ struct hv_x64_intercept_message_header header;
+ struct {
+ __u8 is_memory_op:1;
+ __u8 reserved:7;
+ };
+ __u8 reserved8;
+ __u16 reserved16;
+ enum hv_register_name register_name;
+ union hv_x64_register_access_info access_info;
+};
+
+union hv_x64_memory_access_info {
+ __u8 as_uint8;
+ struct {
+ __u8 gva_valid:1;
+ __u8 gva_gpa_valid:1;
+ __u8 hypercall_output_pending:1;
+ __u8 tlb_locked_no_overlay:1;
+ __u8 reserved:4;
+ };
+};
+
+union hv_x64_io_port_access_info {
+ __u8 as_uint8;
+ struct {
+ __u8 access_size:3;
+ __u8 string_op:1;
+ __u8 rep_prefix:1;
+ __u8 reserved:3;
+ };
+};
+
+union hv_x64_exception_info {
+ __u8 as_uint8;
+ struct {
+ __u8 error_code_valid:1;
+ __u8 software_exception:1;
+ __u8 reserved:6;
+ };
+};
+
+enum hv_cache_type {
+ HV_CACHE_TYPE_UNCACHED = 0,
+ HV_CACHE_TYPE_WRITE_COMBINING = 1,
+ HV_CACHE_TYPE_WRITE_THROUGH = 4,
+ HV_CACHE_TYPE_WRITE_PROTECTED = 5,
+ HV_CACHE_TYPE_WRITE_BACK = 6
+};
+
+struct hv_x64_memory_intercept_message {
+ struct hv_x64_intercept_message_header header;
+ enum hv_cache_type cache_type;
+ __u8 instruction_byte_count;
+ union hv_x64_memory_access_info memory_access_info;
+ __u8 tpr_priority;
+ __u8 reserved1;
+ __u64 guest_virtual_address;
+ __u64 guest_physical_address;
+ __u8 instruction_bytes[16];
+};
+
+struct hv_x64_cpuid_intercept_message {
+ struct hv_x64_intercept_message_header header;
+ __u64 rax;
+ __u64 rcx;
+ __u64 rdx;
+ __u64 rbx;
+ __u64 default_result_rax;
+ __u64 default_result_rcx;
+ __u64 default_result_rdx;
+ __u64 default_result_rbx;
+};
+
+struct hv_x64_msr_intercept_message {
+ struct hv_x64_intercept_message_header header;
+ __u32 msr_number;
+ __u32 reserved;
+ __u64 rdx;
+ __u64 rax;
+};
+
+struct hv_x64_io_port_intercept_message {
+ struct hv_x64_intercept_message_header header;
+ __u16 port_number;
+ union hv_x64_io_port_access_info access_info;
+ __u8 instruction_byte_count;
+ __u32 reserved;
+ __u64 rax;
+ __u8 instruction_bytes[16];
+ struct hv_x64_segment_register ds_segment;
+ struct hv_x64_segment_register es_segment;
+ __u64 rcx;
+ __u64 rsi;
+ __u64 rdi;
+};
+
+struct hv_x64_exception_intercept_message {
+ struct hv_x64_intercept_message_header header;
+ __u16 exception_vector;
+ union hv_x64_exception_info exception_info;
+ __u8 instruction_byte_count;
+ __u32 error_code;
+ __u64 exception_parameter;
+ __u64 reserved;
+ __u8 instruction_bytes[16];
+ struct hv_x64_segment_register ds_segment;
+ struct hv_x64_segment_register ss_segment;
+ __u64 rax;
+ __u64 rcx;
+ __u64 rdx;
+ __u64 rbx;
+ __u64 rsp;
+ __u64 rbp;
+ __u64 rsi;
+ __u64 rdi;
+ __u64 r8;
+ __u64 r9;
+ __u64 r10;
+ __u64 r11;
+ __u64 r12;
+ __u64 r13;
+ __u64 r14;
+ __u64 r15;
+};
+
+struct hv_x64_invalid_vp_register_message {
+ __u32 vp_index;
+ __u32 reserved;
+};
+
+struct hv_x64_unrecoverable_exception_message {
+ struct hv_x64_intercept_message_header header;
+};
+
+enum hv_x64_unsupported_feature_code {
+ hv_unsupported_feature_intercept = 1,
+ hv_unsupported_feature_task_switch_tss = 2
+};
+
+struct hv_x64_unsupported_feature_message {
+ __u32 vp_index;
+ enum hv_x64_unsupported_feature_code feature_code;
+ __u64 feature_parameter;
+};
+
+struct hv_x64_halt_message {
+ struct hv_x64_intercept_message_header header;
+};
+
+enum hv_x64_pending_interruption_type {
+ HV_X64_PENDING_INTERRUPT = 0,
+ HV_X64_PENDING_NMI = 2,
+ HV_X64_PENDING_EXCEPTION = 3
+};
+
+struct hv_x64_interruption_deliverable_message {
+ struct hv_x64_intercept_message_header header;
+ enum hv_x64_pending_interruption_type deliverable_type;
+ __u32 rsvd;
+};
+
+struct hv_x64_sipi_intercept_message {
+ struct hv_x64_intercept_message_header header;
+ __u32 target_vp_index;
+ __u32 interrupt_vector;
+};
+
+struct hv_x64_apic_eoi_message {
+ __u32 vp_index;
+ __u32 interrupt_vector;
+};
+
#endif
diff --git a/include/asm-generic/hyperv-tlfs.h b/include/asm-generic/hyperv-tlfs.h
index b9295400c20b..e0185c3872a9 100644
--- a/include/asm-generic/hyperv-tlfs.h
+++ b/include/asm-generic/hyperv-tlfs.h
@@ -241,6 +241,8 @@ static inline const char *hv_status_to_string(enum hv_status status)
/* Valid SynIC vectors are 16-255. */
#define HV_SYNIC_FIRST_VALID_VECTOR (16)
+#define HV_SYNIC_INTERCEPTION_SINT_INDEX 0x00000000
+
#define HV_SYNIC_CONTROL_ENABLE (1ULL << 0)
#define HV_SYNIC_SIMP_ENABLE (1ULL << 0)
#define HV_SYNIC_SIEFP_ENABLE (1ULL << 0)
@@ -250,49 +252,6 @@ static inline const char *hv_status_to_string(enum hv_status status)
#define HV_SYNIC_STIMER_COUNT (4)
-/* Define synthetic interrupt controller message constants. */
-#define HV_MESSAGE_SIZE (256)
-#define HV_MESSAGE_PAYLOAD_BYTE_COUNT (240)
-#define HV_MESSAGE_PAYLOAD_QWORD_COUNT (30)
-
-/* Define synthetic interrupt controller message flags. */
-union hv_message_flags {
- __u8 asu8;
- struct {
- __u8 msg_pending:1;
- __u8 reserved:7;
- } __packed;
-};
-
-/* Define port identifier type. */
-union hv_port_id {
- __u32 asu32;
- struct {
- __u32 id:24;
- __u32 reserved:8;
- } __packed u;
-};
-
-/* Define synthetic interrupt controller message header. */
-struct hv_message_header {
- __u32 message_type;
- __u8 payload_size;
- union hv_message_flags message_flags;
- __u8 reserved[2];
- union {
- __u64 sender;
- union hv_port_id port;
- };
-} __packed;
-
-/* Define synthetic interrupt controller message format. */
-struct hv_message {
- struct hv_message_header header;
- union {
- __u64 payload[HV_MESSAGE_PAYLOAD_QWORD_COUNT];
- } u;
-} __packed;
-
/* Define the synthetic interrupt message page layout. */
struct hv_message_page {
struct hv_message sint_message[HV_SYNIC_SINT_COUNT];
@@ -306,7 +265,6 @@ struct hv_timer_message_payload {
__u64 delivery_time; /* When the message was delivered */
} __packed;
-
/* Define synthetic interrupt controller flag constants. */
#define HV_EVENT_FLAGS_COUNT (256 * 8)
#define HV_EVENT_FLAGS_LONG_COUNT (256 / sizeof(unsigned long))
diff --git a/include/linux/mshv.h b/include/linux/mshv.h
index dfe469f573f9..7709aaa1e064 100644
--- a/include/linux/mshv.h
+++ b/include/linux/mshv.h
@@ -42,6 +42,7 @@ struct mshv_partition {
};
struct mshv {
+ struct hv_message_page __percpu **synic_message_page;
struct {
spinlock_t lock;
u64 count;
diff --git a/include/uapi/asm-generic/hyperv-tlfs.h b/include/uapi/asm-generic/hyperv-tlfs.h
index e7b09b9f00de..e87389054b68 100644
--- a/include/uapi/asm-generic/hyperv-tlfs.h
+++ b/include/uapi/asm-generic/hyperv-tlfs.h
@@ -6,6 +6,49 @@
#define BIT(X) (1ULL << (X))
#endif
+/* Define synthetic interrupt controller message constants. */
+#define HV_MESSAGE_SIZE (256)
+#define HV_MESSAGE_PAYLOAD_BYTE_COUNT (240)
+#define HV_MESSAGE_PAYLOAD_QWORD_COUNT (30)
+
+/* Define synthetic interrupt controller message flags. */
+union hv_message_flags {
+ __u8 asu8;
+ struct {
+ __u8 msg_pending:1;
+ __u8 reserved:7;
+ };
+};
+
+/* Define port identifier type. */
+union hv_port_id {
+ __u32 asu32;
+ struct {
+ __u32 id:24;
+ __u32 reserved:8;
+ } u;
+};
+
+/* Define synthetic interrupt controller message header. */
+struct hv_message_header {
+ enum hv_message_type message_type;
+ __u8 payload_size;
+ union hv_message_flags message_flags;
+ __u8 reserved[2];
+ union {
+ __u64 sender;
+ union hv_port_id port;
+ };
+};
+
+/* Define synthetic interrupt controller message format. */
+struct hv_message {
+ struct hv_message_header header;
+ union {
+ __u64 payload[HV_MESSAGE_PAYLOAD_QWORD_COUNT];
+ } u;
+};
+
/* Userspace-visible partition creation flags */
#define HV_PARTITION_CREATION_FLAG_SMT_ENABLED_GUEST BIT(0)
#define HV_PARTITION_CREATION_FLAG_GPA_LARGE_PAGES_DISABLED BIT(3)
diff --git a/virt/mshv/mshv_main.c b/virt/mshv/mshv_main.c
index 2a10137a1e84..c9445d2edb37 100644
--- a/virt/mshv/mshv_main.c
+++ b/virt/mshv/mshv_main.c
@@ -15,6 +15,8 @@
#include <linux/file.h>
#include <linux/anon_inodes.h>
#include <linux/mm.h>
+#include <linux/io.h>
+#include <linux/cpuhotplug.h>
#include <linux/mshv.h>
#include <asm/mshyperv.h>
@@ -1152,23 +1154,111 @@ mshv_dev_release(struct inode *inode, struct file *filp)
return 0;
}
+static int
+mshv_synic_init(unsigned int cpu)
+{
+ union hv_synic_simp simp;
+ union hv_synic_sint sint;
+ union hv_synic_scontrol sctrl;
+ struct hv_message_page **msg_page =
+ this_cpu_ptr(mshv.synic_message_page);
+
+ /* Setup the Synic's message page */
+ hv_get_simp(simp.as_uint64);
+ simp.simp_enabled = true;
+ *msg_page = memremap(simp.base_simp_gpa << PAGE_SHIFT,
+ PAGE_SIZE, MEMREMAP_WB);
+ if (!msg_page) {
+ pr_err("%s: memremap failed\n", __func__);
+ return -EFAULT;
+ }
+ hv_set_simp(simp.as_uint64);
+
+ /* Enable intercepts */
+ sint.as_uint64 = 0;
+ sint.vector = HYPERVISOR_CALLBACK_VECTOR;
+ sint.masked = false;
+ sint.auto_eoi = hv_recommend_using_aeoi();
+ hv_set_synint_state(HV_SYNIC_INTERCEPTION_SINT_INDEX, sint.as_uint64);
+
+ /* Enable global synic bit */
+ hv_get_synic_state(sctrl.as_uint64);
+ sctrl.enable = 1;
+ hv_set_synic_state(sctrl.as_uint64);
+
+ return 0;
+}
+
+static int
+mshv_synic_cleanup(unsigned int cpu)
+{
+ union hv_synic_sint sint;
+ union hv_synic_simp simp;
+ union hv_synic_scontrol sctrl;
+ struct hv_message_page **msg_page =
+ this_cpu_ptr(mshv.synic_message_page);
+
+ /* Disable the interrupt */
+ hv_get_synint_state(HV_SYNIC_INTERCEPTION_SINT_INDEX, sint.as_uint64);
+ sint.masked = true;
+ hv_set_synint_state(HV_SYNIC_INTERCEPTION_SINT_INDEX, sint.as_uint64);
+
+ /* Disable Synic's message page */
+ hv_get_simp(simp.as_uint64);
+ simp.simp_enabled = false;
+ hv_set_simp(simp.as_uint64);
+ memunmap(*msg_page);
+
+ /* Disable global synic bit */
+ hv_get_synic_state(sctrl.as_uint64);
+ sctrl.enable = 0;
+ hv_set_synic_state(sctrl.as_uint64);
+
+ return 0;
+}
+
+static int mshv_cpuhp_online;
+
static int
__init mshv_init(void)
{
- int r;
+ int ret;
- r = misc_register(&mshv_dev);
- if (r)
+ ret = misc_register(&mshv_dev);
+ if (ret) {
pr_err("%s: misc device register failed\n", __func__);
+ return ret;
+ }
+ spin_lock_init(&mshv.partitions.lock);
+ mshv.synic_message_page = alloc_percpu(struct hv_message_page *);
+ if (!mshv.synic_message_page) {
+ pr_err("%s: failed to allocate percpu synic page\n", __func__);
+ misc_deregister(&mshv_dev);
+ return -ENOMEM;
+ }
+
+ ret = cpuhp_setup_state(CPUHP_AP_ONLINE_DYN, "mshv_synic",
+ mshv_synic_init,
+ mshv_synic_cleanup);
+ if (ret < 0) {
+ pr_err("%s: failed to setup cpu hotplug state: %i\n",
+ __func__, ret);
+ return ret;
+ }
+
+ mshv_cpuhp_online = ret;
spin_lock_init(&mshv.partitions.lock);
- return r;
+ return 0;
}
static void
__exit mshv_exit(void)
{
+ cpuhp_remove_state(mshv_cpuhp_online);
+ free_percpu(mshv.synic_message_page);
+
misc_deregister(&mshv_dev);
}
--
2.25.1