x86/hyper-v: Add synthetic debugger definitions

Hyper-V synthetic debugger has two modes, one that uses MSRs and
the other that use Hypercalls.

Add all the required definitions to both types of synthetic debugger
interface.

Some of the required new CPUIDs and MSRs are not documented in the TLFS
so they are in hyperv.h instead.

The reason they are not documented is because they are subjected to be
removed in future versions of Windows.

Reviewed-by: Michael Kelley <mikelley@microsoft.com>
Signed-off-by: Jon Doron <arilou@gmail.com>
Message-Id: <20200529134543.1127440-3-arilou@gmail.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

diff --git a/arch/x86/include/asm/hyperv-tlfs.h b/arch/x86/include/asm/hyperv-tlfs.h
index 2933657..53ef6b7 100644 (file)
--- a/arch/x86/include/asm/hyperv-tlfs.h
+++ b/arch/x86/include/asm/hyperv-tlfs.h
@@ -131,6 +131,8 @@
 #define HV_FEATURE_FREQUENCY_MSRS_AVAILABLE            BIT(8)
 /* Crash MSR available */
 #define HV_FEATURE_GUEST_CRASH_MSR_AVAILABLE           BIT(10)
+/* Support for debug MSRs available */
+#define HV_FEATURE_DEBUG_MSRS_AVAILABLE                        BIT(11)
 /* stimer Direct Mode is available */
 #define HV_STIMER_DIRECT_MODE_AVAILABLE                        BIT(19)
 
@@ -376,6 +378,9 @@ struct hv_tsc_emulation_status {
 #define HVCALL_SEND_IPI_EX                     0x0015
 #define HVCALL_POST_MESSAGE                    0x005c
 #define HVCALL_SIGNAL_EVENT                    0x005d
+#define HVCALL_POST_DEBUG_DATA                 0x0069
+#define HVCALL_RETRIEVE_DEBUG_DATA             0x006a
+#define HVCALL_RESET_DEBUG_SESSION             0x006b
 #define HVCALL_RETARGET_INTERRUPT              0x007e
 #define HVCALL_FLUSH_GUEST_PHYSICAL_ADDRESS_SPACE 0x00af
 #define HVCALL_FLUSH_GUEST_PHYSICAL_ADDRESS_LIST 0x00b0
@@ -422,6 +427,7 @@ enum HV_GENERIC_SET_FORMAT {
 #define HV_STATUS_INVALID_HYPERCALL_INPUT      3
 #define HV_STATUS_INVALID_ALIGNMENT            4
 #define HV_STATUS_INVALID_PARAMETER            5
+#define HV_STATUS_OPERATION_DENIED             8
 #define HV_STATUS_INSUFFICIENT_MEMORY          11
 #define HV_STATUS_INVALID_PORT_ID              17
 #define HV_STATUS_INVALID_CONNECTION_ID                18

diff --git a/arch/x86/kvm/hyperv.h b/arch/x86/kvm/hyperv.h
index 757cb57..7f50ff0 100644 (file)
--- a/arch/x86/kvm/hyperv.h
+++ b/arch/x86/kvm/hyperv.h
@@ -23,6 +23,33 @@
 
 #include <linux/kvm_host.h>
 
+/*
+ * The #defines related to the synthetic debugger are required by KDNet, but
+ * they are not documented in the Hyper-V TLFS because the synthetic debugger
+ * functionality has been deprecated and is subject to removal in future
+ * versions of Windows.
+ */
+#define HYPERV_CPUID_SYNDBG_VENDOR_AND_MAX_FUNCTIONS   0x40000080
+#define HYPERV_CPUID_SYNDBG_INTERFACE                  0x40000081
+#define HYPERV_CPUID_SYNDBG_PLATFORM_CAPABILITIES      0x40000082
+
+/*
+ * Hyper-V synthetic debugger platform capabilities
+ * These are HYPERV_CPUID_SYNDBG_PLATFORM_CAPABILITIES.EAX bits.
+ */
+#define HV_X64_SYNDBG_CAP_ALLOW_KERNEL_DEBUGGING       BIT(1)
+
+/* Hyper-V Synthetic debug options MSR */
+#define HV_X64_MSR_SYNDBG_CONTROL              0x400000F1
+#define HV_X64_MSR_SYNDBG_STATUS               0x400000F2
+#define HV_X64_MSR_SYNDBG_SEND_BUFFER          0x400000F3
+#define HV_X64_MSR_SYNDBG_RECV_BUFFER          0x400000F4
+#define HV_X64_MSR_SYNDBG_PENDING_BUFFER       0x400000F5
+#define HV_X64_MSR_SYNDBG_OPTIONS              0x400000FF
+
+/* Hyper-V HV_X64_MSR_SYNDBG_OPTIONS bits */
+#define HV_X64_SYNDBG_OPTION_USE_HCALLS                BIT(2)
+
 static inline struct kvm_vcpu_hv *vcpu_to_hv_vcpu(struct kvm_vcpu *vcpu)
 {
        return &vcpu->arch.hyperv;