1 files changed, 240 insertions, 0 deletions
diff --git a/arch/x86/include/asm/tdx.h b/arch/x86/include/asm/tdx.h
new file mode 100644
index 000000000000..6b338d7f01b7
--- /dev/null
+++ b/arch/x86/include/asm/tdx.h
@@ -0,0 +1,240 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/* Copyright (C) 2021-2022 Intel Corporation */
+#ifndef _ASM_X86_TDX_H
+#define _ASM_X86_TDX_H
+
+#include <linux/init.h>
+#include <linux/bits.h>
+#include <linux/mmzone.h>
+
+#include <asm/errno.h>
+#include <asm/ptrace.h>
+#include <asm/trapnr.h>
+#include <asm/shared/tdx.h>
+
+/*
+ * SW-defined error codes.
+ *
+ * Bits 47:40 == 0xFF indicate Reserved status code class that never used by
+ * TDX module.
+ */
+#define TDX_ERROR			_BITUL(63)
+#define TDX_NON_RECOVERABLE		_BITUL(62)
+#define TDX_SW_ERROR			(TDX_ERROR | GENMASK_ULL(47, 40))
+#define TDX_SEAMCALL_VMFAILINVALID	(TDX_SW_ERROR | _UL(0xFFFF0000))
+
+#define TDX_SEAMCALL_GP			(TDX_SW_ERROR | X86_TRAP_GP)
+#define TDX_SEAMCALL_UD			(TDX_SW_ERROR | X86_TRAP_UD)
+
+/*
+ * TDX module SEAMCALL leaf function error codes
+ */
+#define TDX_SUCCESS		0ULL
+#define TDX_RND_NO_ENTROPY	0x8000020300000000ULL
+
+#ifndef __ASSEMBLER__
+
+#include <uapi/asm/mce.h>
+#include <asm/tdx_global_metadata.h>
+#include <linux/pgtable.h>
+
+/*
+ * Used by the #VE exception handler to gather the #VE exception
+ * info from the TDX module. This is a software only structure
+ * and not part of the TDX module/VMM ABI.
+ */
+struct ve_info {
+	u64 exit_reason;
+	u64 exit_qual;
+	/* Guest Linear (virtual) Address */
+	u64 gla;
+	/* Guest Physical Address */
+	u64 gpa;
+	u32 instr_len;
+	u32 instr_info;
+};
+
+#ifdef CONFIG_INTEL_TDX_GUEST
+
+void __init tdx_early_init(void);
+
+void tdx_get_ve_info(struct ve_info *ve);
+
+bool tdx_handle_virt_exception(struct pt_regs *regs, struct ve_info *ve);
+
+void tdx_halt(void);
+
+bool tdx_early_handle_ve(struct pt_regs *regs);
+
+int tdx_mcall_get_report0(u8 *reportdata, u8 *tdreport);
+
+int tdx_mcall_extend_rtmr(u8 index, u8 *data);
+
+u64 tdx_hcall_get_quote(u8 *buf, size_t size);
+
+void __init tdx_dump_attributes(u64 td_attr);
+void __init tdx_dump_td_ctls(u64 td_ctls);
+
+#else
+
+static inline void tdx_early_init(void) { };
+static inline void tdx_halt(void) { };
+
+static inline bool tdx_early_handle_ve(struct pt_regs *regs) { return false; }
+
+#endif /* CONFIG_INTEL_TDX_GUEST */
+
+#if defined(CONFIG_KVM_GUEST) && defined(CONFIG_INTEL_TDX_GUEST)
+long tdx_kvm_hypercall(unsigned int nr, unsigned long p1, unsigned long p2,
+		       unsigned long p3, unsigned long p4);
+#else
+static inline long tdx_kvm_hypercall(unsigned int nr, unsigned long p1,
+				     unsigned long p2, unsigned long p3,
+				     unsigned long p4)
+{
+	return -ENODEV;
+}
+#endif /* CONFIG_INTEL_TDX_GUEST && CONFIG_KVM_GUEST */
+
+#ifdef CONFIG_INTEL_TDX_HOST
+u64 __seamcall(u64 fn, struct tdx_module_args *args);
+u64 __seamcall_ret(u64 fn, struct tdx_module_args *args);
+u64 __seamcall_saved_ret(u64 fn, struct tdx_module_args *args);
+void tdx_init(void);
+
+#include <linux/preempt.h>
+#include <asm/archrandom.h>
+#include <asm/processor.h>
+
+typedef u64 (*sc_func_t)(u64 fn, struct tdx_module_args *args);
+
+static __always_inline u64 __seamcall_dirty_cache(sc_func_t func, u64 fn,
+						  struct tdx_module_args *args)
+{
+	lockdep_assert_preemption_disabled();
+
+	/*
+	 * SEAMCALLs are made to the TDX module and can generate dirty
+	 * cachelines of TDX private memory.  Mark cache state incoherent
+	 * so that the cache can be flushed during kexec.
+	 *
+	 * This needs to be done before actually making the SEAMCALL,
+	 * because kexec-ing CPU could send NMI to stop remote CPUs,
+	 * in which case even disabling IRQ won't help here.
+	 */
+	this_cpu_write(cache_state_incoherent, true);
+
+	return func(fn, args);
+}
+
+static __always_inline u64 sc_retry(sc_func_t func, u64 fn,
+			   struct tdx_module_args *args)
+{
+	int retry = RDRAND_RETRY_LOOPS;
+	u64 ret;
+
+	do {
+		preempt_disable();
+		ret = __seamcall_dirty_cache(func, fn, args);
+		preempt_enable();
+	} while (ret == TDX_RND_NO_ENTROPY && --retry);
+
+	return ret;
+}
+
+#define seamcall(_fn, _args)		sc_retry(__seamcall, (_fn), (_args))
+#define seamcall_ret(_fn, _args)	sc_retry(__seamcall_ret, (_fn), (_args))
+#define seamcall_saved_ret(_fn, _args)	sc_retry(__seamcall_saved_ret, (_fn), (_args))
+int tdx_cpu_enable(void);
+int tdx_enable(void);
+const char *tdx_dump_mce_info(struct mce *m);
+const struct tdx_sys_info *tdx_get_sysinfo(void);
+
+int tdx_guest_keyid_alloc(void);
+u32 tdx_get_nr_guest_keyids(void);
+void tdx_guest_keyid_free(unsigned int keyid);
+
+void tdx_quirk_reset_page(struct page *page);
+
+struct tdx_td {
+	/* TD root structure: */
+	struct page *tdr_page;
+
+	int tdcs_nr_pages;
+	/* TD control structure: */
+	struct page **tdcs_pages;
+
+	/* Size of `tdcx_pages` in struct tdx_vp */
+	int tdcx_nr_pages;
+};
+
+struct tdx_vp {
+	/* TDVP root page */
+	struct page *tdvpr_page;
+	/* precalculated page_to_phys(tdvpr_page) for use in noinstr code */
+	phys_addr_t tdvpr_pa;
+
+	/* TD vCPU control structure: */
+	struct page **tdcx_pages;
+};
+
+static inline u64 mk_keyed_paddr(u16 hkid, struct page *page)
+{
+	u64 ret;
+
+	ret = page_to_phys(page);
+	/* KeyID bits are just above the physical address bits: */
+	ret |= (u64)hkid << boot_cpu_data.x86_phys_bits;
+
+	return ret;
+}
+
+static inline int pg_level_to_tdx_sept_level(enum pg_level level)
+{
+        WARN_ON_ONCE(level == PG_LEVEL_NONE);
+        return level - 1;
+}
+
+u64 tdh_vp_enter(struct tdx_vp *vp, struct tdx_module_args *args);
+u64 tdh_mng_addcx(struct tdx_td *td, struct page *tdcs_page);
+u64 tdh_mem_page_add(struct tdx_td *td, u64 gpa, struct page *page, struct page *source, u64 *ext_err1, u64 *ext_err2);
+u64 tdh_mem_sept_add(struct tdx_td *td, u64 gpa, int level, struct page *page, u64 *ext_err1, u64 *ext_err2);
+u64 tdh_vp_addcx(struct tdx_vp *vp, struct page *tdcx_page);
+u64 tdh_mem_page_aug(struct tdx_td *td, u64 gpa, int level, struct page *page, u64 *ext_err1, u64 *ext_err2);
+u64 tdh_mem_range_block(struct tdx_td *td, u64 gpa, int level, u64 *ext_err1, u64 *ext_err2);
+u64 tdh_mng_key_config(struct tdx_td *td);
+u64 tdh_mng_create(struct tdx_td *td, u16 hkid);
+u64 tdh_vp_create(struct tdx_td *td, struct tdx_vp *vp);
+u64 tdh_mng_rd(struct tdx_td *td, u64 field, u64 *data);
+u64 tdh_mr_extend(struct tdx_td *td, u64 gpa, u64 *ext_err1, u64 *ext_err2);
+u64 tdh_mr_finalize(struct tdx_td *td);
+u64 tdh_vp_flush(struct tdx_vp *vp);
+u64 tdh_mng_vpflushdone(struct tdx_td *td);
+u64 tdh_mng_key_freeid(struct tdx_td *td);
+u64 tdh_mng_init(struct tdx_td *td, u64 td_params, u64 *extended_err);
+u64 tdh_vp_init(struct tdx_vp *vp, u64 initial_rcx, u32 x2apicid);
+u64 tdh_vp_rd(struct tdx_vp *vp, u64 field, u64 *data);
+u64 tdh_vp_wr(struct tdx_vp *vp, u64 field, u64 data, u64 mask);
+u64 tdh_phymem_page_reclaim(struct page *page, u64 *tdx_pt, u64 *tdx_owner, u64 *tdx_size);
+u64 tdh_mem_track(struct tdx_td *tdr);
+u64 tdh_mem_page_remove(struct tdx_td *td, u64 gpa, u64 level, u64 *ext_err1, u64 *ext_err2);
+u64 tdh_phymem_cache_wb(bool resume);
+u64 tdh_phymem_page_wbinvd_tdr(struct tdx_td *td);
+u64 tdh_phymem_page_wbinvd_hkid(u64 hkid, struct page *page);
+#else
+static inline void tdx_init(void) { }
+static inline int tdx_cpu_enable(void) { return -ENODEV; }
+static inline int tdx_enable(void)  { return -ENODEV; }
+static inline u32 tdx_get_nr_guest_keyids(void) { return 0; }
+static inline const char *tdx_dump_mce_info(struct mce *m) { return NULL; }
+static inline const struct tdx_sys_info *tdx_get_sysinfo(void) { return NULL; }
+#endif	/* CONFIG_INTEL_TDX_HOST */
+
+#ifdef CONFIG_KEXEC_CORE
+void tdx_cpu_flush_cache_for_kexec(void);
+#else
+static inline void tdx_cpu_flush_cache_for_kexec(void) { }
+#endif
+
+#endif /* !__ASSEMBLER__ */
+#endif /* _ASM_X86_TDX_H */