Date:   Mon, 16 Nov 2020 10:26:41 -0800
From:   isaku.yamahata@...el.com
To:     Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        "H . Peter Anvin" <hpa@...or.com>,
        Paolo Bonzini <pbonzini@...hat.com>,
        Vitaly Kuznetsov <vkuznets@...hat.com>,
        Wanpeng Li <wanpengli@...cent.com>,
        Jim Mattson <jmattson@...gle.com>,
        Joerg Roedel <joro@...tes.org>, x86@...nel.org,
        linux-kernel@...r.kernel.org, kvm@...r.kernel.org
Cc:     isaku.yamahata@...el.com, isaku.yamahata@...il.com,
        Sean Christopherson <sean.j.christopherson@...el.com>,
        Kai Huang <kai.huang@...ux.intel.com>,
        Xiaoyao Li <xiaoyao.li@...el.com>
Subject: [RFC PATCH 56/67] KVM: TDX: Add macro framework to wrap TDX SEAMCALLs

From: Sean Christopherson <sean.j.christopherson@...el.com>

Co-developed-by: Kai Huang <kai.huang@...ux.intel.com>
Signed-off-by: Kai Huang <kai.huang@...ux.intel.com>
Co-developed-by: Xiaoyao Li <xiaoyao.li@...el.com>
Signed-off-by: Xiaoyao Li <xiaoyao.li@...el.com>
Signed-off-by: Sean Christopherson <sean.j.christopherson@...el.com>
---
 arch/x86/kvm/vmx/tdx_ops.h | 531 +++++++++++++++++++++++++++++++++++++
 1 file changed, 531 insertions(+)
 create mode 100644 arch/x86/kvm/vmx/tdx_ops.h

diff --git a/arch/x86/kvm/vmx/tdx_ops.h b/arch/x86/kvm/vmx/tdx_ops.h
new file mode 100644
index 000000000000..a6f87cfe9bda
--- /dev/null
+++ b/arch/x86/kvm/vmx/tdx_ops.h
@@ -0,0 +1,531 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef __KVM_X86_TDX_OPS_H
+#define __KVM_X86_TDX_OPS_H
+
+#include <linux/compiler.h>
+
+#include <asm/asm.h>
+#include <asm/kvm_host.h>
+
+struct tdx_ex_ret {
+	union {
+		/* Used to retrieve values from hardware. */
+		struct {
+			u64 rcx;
+			u64 rdx;
+			u64 r8;
+			u64 r9;
+			u64 r10;
+		};
+		/* Functions that return SEPT and level that failed. */
+		struct {
+			u64 septep;
+			int level;
+		};
+		/* TDDBG{RD,WR} return the TDR, field code, and value. */
+		struct {
+			u64 tdr;
+			u64 field;
+			u64 field_val;
+		};
+		/* TDDBG{RD,WR}MEM return the address and its value. */
+		struct {
+			u64 addr;
+			u64 val;
+		};
+		/* TDRDPAGEMD and TDRECLAIMPAGE return page metadata. */
+		struct {
+			u64 page_type;
+			u64 owner;
+			u64 page_size;
+		};
+		/* TDRDSEPT returns the contents of the SEPT entry. */
+		struct {
+			u64 septe;
+			u64 ign;
+		};
+		/*
+		 * TDSYSINFO returns the buffer address and its size, and the
+		 * CMR_INFO address and its number of entries.
+		 */
+		struct {
+			u64 buffer;
+			u64 nr_bytes;
+			u64 cmr_info;
+			u64 nr_cmr_entries;
+		};
+		/*
+		 * TDINIT and TDSYSINIT return CPUID info on error.  Note, only
+		 * the leaf and subleaf are valid on TDINIT error.
+		 */
+		struct {
+			u32 leaf;
+			u32 subleaf;
+			u32 eax_mask;
+			u32 ebx_mask;
+			u32 ecx_mask;
+			u32 edx_mask;
+			u32 eax_val;
+			u32 ebx_val;
+			u32 ecx_val;
+			u32 edx_val;
+		};
+		/* TDSYSINITTDMR returns the input PA and next PA. */
+		struct {
+			u64 prev;
+			u64 next;
+		};
+	};
+};
+
+#define pr_seamcall_error(op, err)					  \
+	pr_err_ratelimited("SEAMCALL[" #op "] failed: 0x%llx (cpu %d)\n", \
+			   SEAMCALL_##op ? (err) : (err), smp_processor_id());
+
+#define TDX_ERR(err, op)			\
+({						\
+	int __ret_warn_on = WARN_ON_ONCE(err);	\
+						\
+	if (unlikely(__ret_warn_on))		\
+		pr_seamcall_error(op, err);	\
+	__ret_warn_on;				\
+})
+
+#define tdenter(args...)		({ 0; })
+
+#define seamcall ".byte 0x66,0x0f,0x01,0xcf"
+
+#ifndef	INTEL_TDX_BOOT_TIME_SEAMCALL
+#define __seamcall				\
+	"1:" seamcall "\n\t"			\
+	"jmp 3f\n\t"				\
+	"2: call kvm_spurious_fault\n\t"	\
+	"3:\n\t"				\
+	_ASM_EXTABLE(1b, 2b)
+#else
+/*
+ * The default BUG()s on faults, which is undesirable during boot, and calls
+ * kvm_spurious_fault(), which isn't linkable if KVM is built as a module.
+ * RAX contains '0' on success, TDX-SEAM errno on failure, vector on fault.
+ */
+#define __seamcall			\
+	"1:" seamcall "\n\t"		\
+	"2: \n\t"			\
+	_ASM_EXTABLE_FAULT(1b, 2b)
+#endif
+
+#define seamcall_N(fn, inputs...)					\
+do {									\
+	u64 ret;							\
+									\
+	asm volatile(__seamcall						\
+		     : ASM_CALL_CONSTRAINT, "=a"(ret)			\
+		     : "a"(SEAMCALL_##fn), inputs			\
+		     : );						\
+	return ret;							\
+} while (0)
+
+#define seamcall_0(fn)	 						\
+	seamcall_N(fn, "i"(0))
+#define seamcall_1(fn, rcx)	 					\
+	seamcall_N(fn, "c"(rcx))
+#define seamcall_2(fn, rcx, rdx)					\
+	seamcall_N(fn, "c"(rcx), "d"(rdx))
+#define seamcall_3(fn, rcx, rdx, __r8)					\
+do {									\
+	register long r8 asm("r8") = __r8;				\
+									\
+	seamcall_N(fn, "c"(rcx), "d"(rdx), "r"(r8));			\
+} while (0)
+#define seamcall_4(fn, rcx, rdx, __r8, __r9)				\
+do {									\
+	register long r8 asm("r8") = __r8;				\
+	register long r9 asm("r9") = __r9;				\
+									\
+	seamcall_N(fn, "c"(rcx), "d"(rdx), "r"(r8), "r"(r9));		\
+} while (0)
+
+#define seamcall_N_2(fn, ex, inputs...)					\
+do {									\
+	u64 ret;							\
+									\
+	asm volatile(__seamcall						\
+		     : ASM_CALL_CONSTRAINT, "=a"(ret),			\
+		       "=c"((ex)->rcx), "=d"((ex)->rdx)			\
+		     : "a"(SEAMCALL_##fn), inputs			\
+		     : );						\
+	return ret;							\
+} while (0)
+
+#define seamcall_0_2(fn, ex)						\
+	seamcall_N_2(fn, ex, "i"(0))
+#define seamcall_1_2(fn, rcx, ex)					\
+	seamcall_N_2(fn, ex, "c"(rcx))
+#define seamcall_2_2(fn, rcx, rdx, ex)					\
+	seamcall_N_2(fn, ex, "c"(rcx), "d"(rdx))
+#define seamcall_3_2(fn, rcx, rdx, __r8, ex)				\
+do {									\
+	register long r8 asm("r8") = __r8;				\
+									\
+	seamcall_N_2(fn, ex, "c"(rcx), "d"(rdx), "r"(r8));		\
+} while (0)
+#define seamcall_4_2(fn, rcx, rdx, __r8, __r9, ex)			\
+do {									\
+	register long r8 asm("r8") = __r8;				\
+	register long r9 asm("r9") = __r9;				\
+									\
+	seamcall_N_2(fn, ex, "c"(rcx), "d"(rdx), "r"(r8), "r"(r9));	\
+} while (0)
+
+#define seamcall_N_3(fn, ex, inputs...)					\
+do {									\
+	register long r8_out asm("r8");					\
+	u64 ret;							\
+									\
+	asm volatile(__seamcall						\
+		     : ASM_CALL_CONSTRAINT, "=a"(ret),			\
+		       "=c"((ex)->rcx), "=d"((ex)->rdx), "=r"(r8_out)	\
+		     : "a"(SEAMCALL_##fn), inputs			\
+		     : );						\
+	(ex)->r8 = r8_out;						\
+	return ret;							\
+} while (0)
+
+#define seamcall_0_3(fn, ex)						\
+	seamcall_N_3(fn, ex, "i"(0))
+#define seamcall_1_3(fn, rcx, ex)					\
+	seamcall_N_3(fn, ex, "c"(rcx))
+#define seamcall_2_3(fn, rcx, rdx, ex)					\
+	seamcall_N_3(fn, ex, "c"(rcx), "d"(rdx))
+#define seamcall_3_3(fn, rcx, rdx, __r8, ex)				\
+do {									\
+	register long r8 asm("r8") = __r8;				\
+									\
+	seamcall_N_3(fn, ex, "c"(rcx), "d"(rdx), "r"(r8));		\
+} while (0)
+#define seamcall_4_3(fn, rcx, rdx, __r8, __r9, ex)			\
+do {									\
+	register long r8 asm("r8") = __r8;				\
+	register long r9 asm("r9") = __r9;				\
+									\
+	seamcall_N_3(fn, ex, "c"(rcx), "d"(rdx), "r"(r8), "r"(r9));	\
+} while (0)
+
+#define seamcall_N_4(fn, ex, inputs...)					\
+do {									\
+	register long r8_out asm("r8");					\
+	register long r9_out asm("r9");					\
+	u64 ret;							\
+									\
+	asm volatile(__seamcall						\
+		     : ASM_CALL_CONSTRAINT, "=a"(ret), "=c"((ex)->rcx),	\
+		       "=d"((ex)->rdx), "=r"(r8_out), "=r"(r9_out)	\
+		     : "a"(SEAMCALL_##fn), inputs			\
+		     : );						\
+	(ex)->r8 = r8_out;						\
+	(ex)->r9 = r9_out;						\
+	return ret;							\
+} while (0)
+
+#define seamcall_0_4(fn, ex)						\
+	seamcall_N_4(fn, ex, "i"(0))
+#define seamcall_1_4(fn, rcx, ex)					\
+	seamcall_N_4(fn, ex, "c"(rcx))
+#define seamcall_2_4(fn, rcx, rdx, ex)					\
+	seamcall_N_4(fn, ex, "c"(rcx), "d"(rdx))
+#define seamcall_3_4(fn, rcx, rdx, __r8, ex)				\
+do {									\
+	register long r8 asm("r8") = __r8;				\
+									\
+	seamcall_N_4(fn, ex, "c"(rcx), "d"(rdx), "r"(r8));		\
+} while (0)
+#define seamcall_4_4(fn, rcx, rdx, __r8, __r9, ex)			\
+do {									\
+	register long r8 asm("r8") = __r8;				\
+	register long r9 asm("r9") = __r9;				\
+									\
+	seamcall_N_4(fn, ex, "c"(rcx), "d"(rdx), "r"(r8), "r"(r9));	\
+} while (0)
+
+#define seamcall_N_5(fn, ex, inputs...)					\
+do {									\
+	register long r8_out asm("r8");					\
+	register long r9_out asm("r9");					\
+	register long r10_out asm("r10");				\
+	u64 ret;							\
+									\
+	asm volatile(__seamcall						\
+		     : ASM_CALL_CONSTRAINT, "=a"(ret), "=c"((ex)->rcx),	\
+		       "=d"((ex)->rdx), "=r"(r8_out), "=r"(r9_out),	\
+		       "=r"(r10_out)					\
+		     : "a"(SEAMCALL_##fn), inputs			\
+		     : );						\
+	(ex)->r8 = r8_out;						\
+	(ex)->r9 = r9_out;						\
+	(ex)->r10 = r10_out;						\
+	return ret;							\
+} while (0)
+
+#define seamcall_0_5(fn, ex)						\
+	seamcall_N_5(fn, ex, "i"(0))
+#define seamcall_1_5(fn, rcx, ex)					\
+	seamcall_N_5(fn, ex, "c"(rcx))
+#define seamcall_2_5(fn, rcx, rdx, ex)					\
+	seamcall_N_5(fn, ex, "c"(rcx), "d"(rdx))
+#define seamcall_3_5(fn, rcx, rdx, __r8, ex)				\
+do {									\
+	register long r8 asm("r8") = __r8;				\
+									\
+	seamcall_N_5(fn, ex, "c"(rcx), "d"(rdx), "r"(r8));		\
+} while (0)
+#define seamcall_4_5(fn, rcx, rdx, __r8, __r9, ex)			\
+do {									\
+	register long r8 asm("r8") = __r8;				\
+	register long r9 asm("r9") = __r9;				\
+									\
+	seamcall_N_5(fn, ex, "c"(rcx), "d"(rdx), "r"(r8), "r"(r9));	\
+} while (0)
+#define seamcall_5_5(fn, rcx, rdx, __r8, __r9, __r10, ex)		\
+do {									\
+	register long r8 asm("r8") = __r8;				\
+	register long r9 asm("r9") = __r9;				\
+	register long r10 asm("r10") = __r10;				\
+									\
+	seamcall_N_5(fn, ex, "c"(rcx), "d"(rdx), "r"(r8), "r"(r9), "r"(r10)); \
+} while (0)
+
+static inline u64 tdaddcx(hpa_t tdr, hpa_t addr)
+{
+	seamcall_2(TDADDCX, addr, tdr);
+}
+
+static inline u64 tdaddpage(hpa_t tdr, gpa_t gpa, hpa_t hpa, hpa_t source,
+			    struct tdx_ex_ret *ex)
+{
+	seamcall_4_2(TDADDPAGE, gpa, tdr, hpa, source, ex);
+}
+
+static inline u64 tdaddsept(hpa_t tdr, gpa_t gpa, int level, hpa_t page,
+			    struct tdx_ex_ret *ex)
+{
+	seamcall_3_2(TDADDSEPT, gpa | level, tdr, page, ex);
+}
+
+static inline u64 tdaddvpx(hpa_t tdvpr, hpa_t addr)
+{
+	seamcall_2(TDADDVPX, addr, tdvpr);
+}
+
+static inline u64 tdassignhkid(hpa_t tdr, int hkid)
+{
+	seamcall_3(TDASSIGNHKID, tdr, 0, hkid);
+}
+
+static inline u64 tdaugpage(hpa_t tdr, gpa_t gpa, hpa_t hpa,
+			    struct tdx_ex_ret *ex)
+{
+	seamcall_3_2(TDAUGPAGE, gpa, tdr, hpa, ex);
+}
+
+static inline u64 tdblock(hpa_t tdr, gpa_t gpa, int level,
+			  struct tdx_ex_ret *ex)
+{
+	seamcall_2_2(TDBLOCK, gpa | level, tdr, ex);
+}
+
+static inline u64 tdconfigkey(hpa_t tdr)
+{
+	seamcall_1(TDCONFIGKEY, tdr);
+}
+
+static inline u64 tdcreate(hpa_t tdr, int hkid)
+{
+	seamcall_2(TDCREATE, tdr, hkid);
+}
+
+static inline u64 tdcreatevp(hpa_t tdr, hpa_t tdvpr)
+{
+	seamcall_2(TDCREATEVP, tdvpr, tdr);
+}
+
+static inline u64 tddbgrd(hpa_t tdr, u64 field, struct tdx_ex_ret *ex)
+{
+	seamcall_2_3(TDDBGRD, tdr, field, ex);
+}
+
+static inline u64 tddbgwr(hpa_t tdr, u64 field, u64 val, u64 mask,
+			  struct tdx_ex_ret *ex)
+{
+	seamcall_4_3(TDDBGWR, tdr, field, val, mask, ex);
+}
+
+static inline u64 tddbgrdmem(hpa_t addr, struct tdx_ex_ret *ex)
+{
+	seamcall_1_2(TDDBGRDMEM, addr, ex);
+}
+
+static inline u64 tddbgwrmem(hpa_t addr, u64 val, struct tdx_ex_ret *ex)
+{
+	seamcall_2_2(TDDBGWRMEM, addr, val, ex);
+}
+
+static inline u64 tddemotepage(hpa_t tdr, gpa_t gpa, int level, hpa_t page,
+			       struct tdx_ex_ret *ex)
+{
+	seamcall_3_2(TDDEMOTEPAGE, gpa | level, tdr, page, ex);
+}
+
+static inline u64 tdextendmr(hpa_t tdr, gpa_t gpa, struct tdx_ex_ret *ex)
+{
+	seamcall_2_2(TDEXTENDMR, gpa, tdr, ex);
+}
+
+static inline u64 tdfinalizemr(hpa_t tdr)
+{
+	seamcall_1(TDFINALIZEMR, tdr);
+}
+
+static inline u64 tdflushvp(hpa_t tdvpr)
+{
+	seamcall_1(TDFLUSHVP, tdvpr);
+}
+
+static inline u64 tdflushvpdone(hpa_t tdr)
+{
+	seamcall_1(TDFLUSHVPDONE, tdr);
+}
+
+static inline u64 tdfreehkids(hpa_t tdr)
+{
+	seamcall_1(TDFREEHKIDS, tdr);
+}
+
+static inline u64 tdinit(hpa_t tdr, hpa_t td_params, struct tdx_ex_ret *ex)
+{
+	seamcall_2_2(TDINIT, tdr, td_params, ex);
+}
+
+static inline u64 tdinitvp(hpa_t tdvpr, u64 rcx)
+{
+	seamcall_2(TDINITVP, tdvpr, rcx);
+}
+
+static inline u64 tdpromotepage(hpa_t tdr, gpa_t gpa, int level,
+				struct tdx_ex_ret *ex)
+{
+	seamcall_2_2(TDPROMOTEPAGE, gpa | level, tdr, ex);
+}
+
+static inline u64 tdrdpagemd(hpa_t page, struct tdx_ex_ret *ex)
+{
+	seamcall_1_3(TDRDPAGEMD, page, ex);
+}
+
+static inline u64 tdrdsept(hpa_t tdr, gpa_t gpa, int level,
+			   struct tdx_ex_ret *ex)
+{
+	seamcall_2_2(TDRDSEPT, gpa | level, tdr, ex);
+}
+
+static inline u64 tdrdvps(hpa_t tdvpr, u64 field, struct tdx_ex_ret *ex)
+{
+	seamcall_2_3(TDRDVPS, tdvpr, field, ex);
+}
+
+static inline u64 tdreclaimhkids(hpa_t tdr)
+{
+	seamcall_1(TDRECLAIMHKIDS, tdr);
+}
+
+static inline u64 tdreclaimpage(hpa_t page, struct tdx_ex_ret *ex)
+{
+	seamcall_1_3(TDRECLAIMPAGE, page, ex);
+}
+
+static inline u64 tdremovepage(hpa_t tdr, gpa_t gpa, int level,
+				struct tdx_ex_ret *ex)
+{
+	seamcall_2_2(TDREMOVEPAGE, gpa | level, tdr, ex);
+}
+
+static inline u64 tdremovesept(hpa_t tdr, gpa_t gpa, int level,
+			       struct tdx_ex_ret *ex)
+{
+	seamcall_2_2(TDREMOVESEPT, gpa | level, tdr, ex);
+}
+
+static inline u64 tdsysconfig(hpa_t tdmr, int nr_entries, int hkid)
+{
+	seamcall_3(TDSYSCONFIG, tdmr, nr_entries, hkid);
+}
+
+static inline u64 tdsysconfigkey(void)
+{
+	seamcall_0(TDSYSCONFIGKEY);
+}
+
+static inline u64 tdsysinfo(hpa_t tdsysinfo, int nr_bytes, hpa_t cmr_info,
+			    int nr_cmr_entries, struct tdx_ex_ret *ex)
+{
+	seamcall_4_4(TDSYSINFO, tdsysinfo, nr_bytes, cmr_info, nr_cmr_entries, ex);
+}
+
+static inline u64 tdsysinit(u64 attributes, struct tdx_ex_ret *ex)
+{
+	seamcall_1_5(TDSYSINIT, attributes, ex);
+}
+
+static inline u64 tdsysinitlp(struct tdx_ex_ret *ex)
+{
+	seamcall_0_3(TDSYSINITLP, ex);
+}
+
+static inline u64 tdsysinittdmr(hpa_t tdmr, struct tdx_ex_ret *ex)
+{
+	seamcall_1_2(TDSYSINITTDMR, tdmr, ex);
+}
+
+static inline u64 tdsysshutdownlp(void)
+{
+	seamcall_0(TDSYSSHUTDOWNLP);
+}
+
+static inline u64 tdteardown(hpa_t tdr)
+{
+	seamcall_1(TDTEARDOWN, tdr);
+}
+
+static inline u64 tdtrack(hpa_t tdr)
+{
+	seamcall_1(TDTRACK, tdr);
+}
+
+static inline u64 tdunblock(hpa_t tdr, gpa_t gpa, int level,
+			    struct tdx_ex_ret *ex)
+{
+	seamcall_2_2(TDUNBLOCK, gpa | level, tdr, ex);
+}
+
+static inline u64 tdwbcache(bool resume)
+{
+	seamcall_1(TDWBCACHE, resume ? 1 : 0);
+}
+
+static inline u64 tdwbinvdpage(hpa_t page)
+{
+	seamcall_1(TDWBINVDPAGE, page);
+}
+
+static inline u64 tdwrsept(hpa_t tdr, gpa_t gpa, int level, u64 val,
+			   struct tdx_ex_ret *ex)
+{
+	seamcall_3_2(TDWRSEPT, gpa | level, tdr, val, ex);
+}
+
+static inline u64 tdwrvps(hpa_t tdvpr, u64 field, u64 val, u64 mask,
+			  struct tdx_ex_ret *ex)
+{
+	seamcall_4_3(TDWRVPS, tdvpr, field, val, mask, ex);
+}
+
+#endif /* __KVM_X86_TDX_OPS_H */
-- 
2.17.1

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