[PATCH v2 12/25] KVM: TDX: Define TDX architectural definitions

[Rick Edgecombe <rick.p.edgecombe@intel.com>]

From: Isaku Yamahata <isaku.yamahata@intel.com>

Define architectural definitions for KVM to issue the TDX SEAMCALLs.

Structures and values that are architecturally defined in the TDX module
specifications the chapter of ABI Reference.

Co-developed-by: Sean Christopherson <sean.j.christopherson@intel.com>
Signed-off-by: Sean Christopherson <sean.j.christopherson@intel.com>
Signed-off-by: Isaku Yamahata <isaku.yamahata@intel.com>
Signed-off-by: Rick Edgecombe <rick.p.edgecombe@intel.com>
Reviewed-by: Paolo Bonzini <pbonzini@redhat.com>
Reviewed-by: Xiaoyao Li <xiaoyao.li@intel.com>
---
uAPI breakout v2:
 - Use TDX 1.5 naming of config_flags instead of exec_controls (Xiaoyao)

uAPI breakout v1:
 - Remove macros no longer needed due to reading metadata done in TDX
   host code:
   - Metadata field ID macros, bit definitions
   - TDX_MAX_NR_CPUID_CONFIGS
 - Drop unused defined (Kai)
 - Fix bisectability issues in headers (Kai)
 - Remove TDX_MAX_VCPUS define (Kai)
 - Remove unused TD_EXIT_OTHER_SMI_IS_MSMI define.
 - Move TDX vm type to separate patch
 - Move unions in tdx_arch.h to where they are introduced (Sean)

v19:
- drop tdvmcall constants by Xiaoyao

v18:
- Add metadata field id
---
 arch/x86/kvm/vmx/tdx.h      |   2 +
 arch/x86/kvm/vmx/tdx_arch.h | 158 ++++++++++++++++++++++++++++++++++++
 2 files changed, 160 insertions(+)
 create mode 100644 arch/x86/kvm/vmx/tdx_arch.h

diff --git a/arch/x86/kvm/vmx/tdx.h b/arch/x86/kvm/vmx/tdx.h
index e6a232d58e6a..1d6fa81a072d 100644
--- a/arch/x86/kvm/vmx/tdx.h
+++ b/arch/x86/kvm/vmx/tdx.h
@@ -1,6 +1,8 @@
 #ifndef  __KVM_X86_VMX_TDX_H
 #define __KVM_X86_VMX_TDX_H
 
+#include "tdx_arch.h"
+
 #ifdef CONFIG_INTEL_TDX_HOST
 void tdx_bringup(void);
 void tdx_cleanup(void);
diff --git a/arch/x86/kvm/vmx/tdx_arch.h b/arch/x86/kvm/vmx/tdx_arch.h
new file mode 100644
index 000000000000..84af7666e958
--- /dev/null
+++ b/arch/x86/kvm/vmx/tdx_arch.h
@@ -0,0 +1,158 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/* architectural constants/data definitions for TDX SEAMCALLs */
+
+#ifndef __KVM_X86_TDX_ARCH_H
+#define __KVM_X86_TDX_ARCH_H
+
+#include <linux/types.h>
+
+#define TDX_VERSION_SHIFT		16
+
+/*
+ * TDX SEAMCALL API function leaves
+ */
+#define TDH_VP_ENTER			0
+#define TDH_MNG_ADDCX			1
+#define TDH_MEM_PAGE_ADD		2
+#define TDH_MEM_SEPT_ADD		3
+#define TDH_VP_ADDCX			4
+#define TDH_MEM_PAGE_AUG		6
+#define TDH_MEM_RANGE_BLOCK		7
+#define TDH_MNG_KEY_CONFIG		8
+#define TDH_MNG_CREATE			9
+#define TDH_VP_CREATE			10
+#define TDH_MNG_RD			11
+#define TDH_MR_EXTEND			16
+#define TDH_MR_FINALIZE			17
+#define TDH_VP_FLUSH			18
+#define TDH_MNG_VPFLUSHDONE		19
+#define TDH_MNG_KEY_FREEID		20
+#define TDH_MNG_INIT			21
+#define TDH_VP_INIT			22
+#define TDH_VP_RD			26
+#define TDH_MNG_KEY_RECLAIMID		27
+#define TDH_PHYMEM_PAGE_RECLAIM		28
+#define TDH_MEM_PAGE_REMOVE		29
+#define TDH_MEM_SEPT_REMOVE		30
+#define TDH_SYS_RD			34
+#define TDH_MEM_TRACK			38
+#define TDH_MEM_RANGE_UNBLOCK		39
+#define TDH_PHYMEM_CACHE_WB		40
+#define TDH_PHYMEM_PAGE_WBINVD		41
+#define TDH_VP_WR			43
+
+/* TDX control structure (TDR/TDCS/TDVPS) field access codes */
+#define TDX_NON_ARCH			BIT_ULL(63)
+#define TDX_CLASS_SHIFT			56
+#define TDX_FIELD_MASK			GENMASK_ULL(31, 0)
+
+#define __BUILD_TDX_FIELD(non_arch, class, field)	\
+	(((non_arch) ? TDX_NON_ARCH : 0) |		\
+	 ((u64)(class) << TDX_CLASS_SHIFT) |		\
+	 ((u64)(field) & TDX_FIELD_MASK))
+
+#define BUILD_TDX_FIELD(class, field)			\
+	__BUILD_TDX_FIELD(false, (class), (field))
+
+#define BUILD_TDX_FIELD_NON_ARCH(class, field)		\
+	__BUILD_TDX_FIELD(true, (class), (field))
+
+
+/* Class code for TD */
+#define TD_CLASS_EXECUTION_CONTROLS	17ULL
+
+/* Class code for TDVPS */
+#define TDVPS_CLASS_VMCS		0ULL
+#define TDVPS_CLASS_GUEST_GPR		16ULL
+#define TDVPS_CLASS_OTHER_GUEST		17ULL
+#define TDVPS_CLASS_MANAGEMENT		32ULL
+
+enum tdx_tdcs_execution_control {
+	TD_TDCS_EXEC_TSC_OFFSET = 10,
+};
+
+/* @field is any of enum tdx_tdcs_execution_control */
+#define TDCS_EXEC(field)		BUILD_TDX_FIELD(TD_CLASS_EXECUTION_CONTROLS, (field))
+
+/* @field is the VMCS field encoding */
+#define TDVPS_VMCS(field)		BUILD_TDX_FIELD(TDVPS_CLASS_VMCS, (field))
+
+/* @field is any of enum tdx_guest_other_state */
+#define TDVPS_STATE(field)		BUILD_TDX_FIELD(TDVPS_CLASS_OTHER_GUEST, (field))
+#define TDVPS_STATE_NON_ARCH(field)	BUILD_TDX_FIELD_NON_ARCH(TDVPS_CLASS_OTHER_GUEST, (field))
+
+/* Management class fields */
+enum tdx_vcpu_guest_management {
+	TD_VCPU_PEND_NMI = 11,
+};
+
+/* @field is any of enum tdx_vcpu_guest_management */
+#define TDVPS_MANAGEMENT(field)		BUILD_TDX_FIELD(TDVPS_CLASS_MANAGEMENT, (field))
+
+#define TDX_EXTENDMR_CHUNKSIZE		256
+
+struct tdx_cpuid_value {
+	u32 eax;
+	u32 ebx;
+	u32 ecx;
+	u32 edx;
+} __packed;
+
+#define TDX_TD_ATTR_DEBUG		BIT_ULL(0)
+#define TDX_TD_ATTR_SEPT_VE_DISABLE	BIT_ULL(28)
+#define TDX_TD_ATTR_PKS			BIT_ULL(30)
+#define TDX_TD_ATTR_KL			BIT_ULL(31)
+#define TDX_TD_ATTR_PERFMON		BIT_ULL(63)
+
+/*
+ * TD_PARAMS is provided as an input to TDH_MNG_INIT, the size of which is 1024B.
+ */
+struct td_params {
+	u64 attributes;
+	u64 xfam;
+	u16 max_vcpus;
+	u8 reserved0[6];
+
+	u64 eptp_controls;
+	u64 config_flags;
+	u16 tsc_frequency;
+	u8  reserved1[38];
+
+	u64 mrconfigid[6];
+	u64 mrowner[6];
+	u64 mrownerconfig[6];
+	u64 reserved2[4];
+
+	union {
+		DECLARE_FLEX_ARRAY(struct tdx_cpuid_value, cpuid_values);
+		u8 reserved3[768];
+	};
+} __packed __aligned(1024);
+
+/*
+ * Guest uses MAX_PA for GPAW when set.
+ * 0: GPA.SHARED bit is GPA[47]
+ * 1: GPA.SHARED bit is GPA[51]
+ */
+#define TDX_CONFIG_FLAGS_MAX_GPAW      BIT_ULL(0)
+
+/*
+ * TDH.VP.ENTER, TDG.VP.VMCALL preserves RBP
+ * 0: RBP can be used for TDG.VP.VMCALL input. RBP is clobbered.
+ * 1: RBP can't be used for TDG.VP.VMCALL input. RBP is preserved.
+ */
+#define TDX_CONFIG_FLAGS_NO_RBP_MOD	BIT_ULL(2)
+
+
+/*
+ * TDX requires the frequency to be defined in units of 25MHz, which is the
+ * frequency of the core crystal clock on TDX-capable platforms, i.e. the TDX
+ * module can only program frequencies that are multiples of 25MHz.  The
+ * frequency must be between 100mhz and 10ghz (inclusive).
+ */
+#define TDX_TSC_KHZ_TO_25MHZ(tsc_in_khz)	((tsc_in_khz) / (25 * 1000))
+#define TDX_TSC_25MHZ_TO_KHZ(tsc_in_25mhz)	((tsc_in_25mhz) * (25 * 1000))
+#define TDX_MIN_TSC_FREQUENCY_KHZ		(100 * 1000)
+#define TDX_MAX_TSC_FREQUENCY_KHZ		(10 * 1000 * 1000)
+
+#endif /* __KVM_X86_TDX_ARCH_H */
-- 
2.47.0