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Message-Id: <20240812224820.34826-3-rick.p.edgecombe@intel.com>
Date: Mon, 12 Aug 2024 15:47:57 -0700
From: Rick Edgecombe <rick.p.edgecombe@...el.com>
To: seanjc@...gle.com,
pbonzini@...hat.com,
kvm@...r.kernel.org
Cc: kai.huang@...el.com,
isaku.yamahata@...il.com,
tony.lindgren@...ux.intel.com,
xiaoyao.li@...el.com,
linux-kernel@...r.kernel.org,
rick.p.edgecombe@...el.com,
Isaku Yamahata <isaku.yamahata@...el.com>,
Sean Christopherson <sean.j.christopherson@...el.com>
Subject: [PATCH 02/25] KVM: TDX: Define TDX architectural definitions
From: Isaku Yamahata <isaku.yamahata@...el.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@...el.com>
Signed-off-by: Sean Christopherson <sean.j.christopherson@...el.com>
Signed-off-by: Isaku Yamahata <isaku.yamahata@...el.com>
Signed-off-by: Rick Edgecombe <rick.p.edgecombe@...el.com>
Reviewed-by: Paolo Bonzini <pbonzini@...hat.com>
Reviewed-by: Xiaoyao Li <xiaoyao.li@...el.com>
---
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..413619dd92ef
--- /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 exec_controls;
+ 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_EXEC_CONTROL_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_CONTROL_FLAG_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 */
--
2.34.1
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