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From: Kuppuswamy Sathyanarayanan  <sathyanarayanan.kuppuswamy@linux.intel.com>
To: Thomas Gleixner <tglx@linutronix.de>,
	Ingo Molnar <mingo@redhat.com>, Borislav Petkov <bp@alien8.de>,
	Peter Zijlstra <peterz@infradead.org>,
	Andy Lutomirski <luto@kernel.org>,
	Hans de Goede <hdegoede@redhat.com>,
	Mark Gross <mgross@linux.intel.com>,
	Alexei Starovoitov <ast@kernel.org>,
	Daniel Borkmann <daniel@iogearbox.net>,
	Andrii Nakryiko <andrii@kernel.org>
Cc: Peter H Anvin <hpa@zytor.com>,
	Dave Hansen <dave.hansen@intel.com>,
	Tony Luck <tony.luck@intel.com>,
	Dan Williams <dan.j.williams@intel.com>,
	Andi Kleen <ak@linux.intel.com>,
	Kirill Shutemov <kirill.shutemov@linux.intel.com>,
	Sean Christopherson <seanjc@google.com>,
	Kuppuswamy Sathyanarayanan <knsathya@kernel.org>,
	x86@kernel.org, linux-kernel@vger.kernel.org,
	platform-driver-x86@vger.kernel.org, bpf@vger.kernel.org,
	netdev@vger.kernel.org
Subject: [PATCH v2 1/6] x86/tdx: Add TDREPORT TDX Module call support
Date: Wed,  7 Jul 2021 13:42:44 -0700	[thread overview]
Message-ID: <20210707204249.3046665-2-sathyanarayanan.kuppuswamy@linux.intel.com> (raw)
In-Reply-To: <20210707204249.3046665-1-sathyanarayanan.kuppuswamy@linux.intel.com>

The TDX Guest-Host Communication Interface (GHCI) includes a module
call (TDREPORT TDCALL) that a guest can make to acquire a copy of the
attestation data that it needs to verify its trustworthiness.

Add a wrapper function tdx_mcall_tdreport() that makes the module
call to get this data.

See GHCI section 2.4.5 "TDCALL [TDG.MR.REPORT] leaf" for additional
details.

[Xiaoyao: Proposed error code fix]
Reviewed-by: Tony Luck <tony.luck@intel.com>
Reviewed-by: Andi Kleen <ak@linux.intel.com>
Signed-off-by: Kuppuswamy Sathyanarayanan <sathyanarayanan.kuppuswamy@linux.intel.com>
---
 arch/x86/include/asm/tdx.h |  2 ++
 arch/x86/kernel/tdx.c      | 33 +++++++++++++++++++++++++++++++++
 2 files changed, 35 insertions(+)

diff --git a/arch/x86/include/asm/tdx.h b/arch/x86/include/asm/tdx.h
index 48927fac9e12..4f1b5c14a09b 100644
--- a/arch/x86/include/asm/tdx.h
+++ b/arch/x86/include/asm/tdx.h
@@ -96,6 +96,8 @@ extern int tdx_hcall_gpa_intent(phys_addr_t gpa, int numpages,
 
 bool tdg_filter_enabled(void);
 
+int tdx_mcall_tdreport(u64 data, u64 reportdata);
+
 /*
  * To support I/O port access in decompressor or early kernel init
  * code, since #VE exception handler cannot be used, use paravirt
diff --git a/arch/x86/kernel/tdx.c b/arch/x86/kernel/tdx.c
index f76af7661046..0f797803f4c8 100644
--- a/arch/x86/kernel/tdx.c
+++ b/arch/x86/kernel/tdx.c
@@ -23,6 +23,7 @@
 /* TDX Module call Leaf IDs */
 #define TDINFO				1
 #define TDGETVEINFO			3
+#define TDREPORT			4
 #define TDACCEPTPAGE			6
 
 /* TDX hypercall Leaf IDs */
@@ -30,6 +31,11 @@
 
 /* TDX Module call error codes */
 #define TDX_PAGE_ALREADY_ACCEPTED       0x8000000000000001
+#define TDCALL_RETURN_CODE_MASK		0xFFFFFFFF00000000
+#define TDCALL_OPERAND_BUSY		0x8000020000000000
+#define TDCALL_INVALID_OPERAND		0x8000000000000000
+#define TDCALL_RETURN_CODE(a)		((a) & TDCALL_RETURN_CODE_MASK)
+
 
 #define VE_IS_IO_OUT(exit_qual)		(((exit_qual) & 8) ? 0 : 1)
 #define VE_GET_IO_SIZE(exit_qual)	(((exit_qual) & 7) + 1)
@@ -139,6 +145,33 @@ static bool tdg_perfmon_enabled(void)
 	return td_info.attributes & BIT(63);
 }
 
+/*
+ * tdx_mcall_tdreport() - Generate TDREPORT_STRUCT using TDCALL.
+ *
+ * @data        : Physical address of 1024B aligned data to store
+ *                TDREPORT_STRUCT.
+ * @reportdata  : Physical address of 64B aligned report data
+ *
+ * return 0 on success or failure error number.
+ */
+int tdx_mcall_tdreport(u64 data, u64 reportdata)
+{
+	u64 ret;
+
+	if (!data || !reportdata || !prot_guest_has(PR_GUEST_TDX))
+		return -EINVAL;
+
+	ret = __trace_tdx_module_call(TDREPORT, data, reportdata, 0, 0, NULL);
+
+	if (TDCALL_RETURN_CODE(ret) == TDCALL_INVALID_OPERAND)
+		return -EINVAL;
+	else if (TDCALL_RETURN_CODE(ret) == TDCALL_OPERAND_BUSY)
+		return -EBUSY;
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(tdx_mcall_tdreport);
+
 static void tdg_get_info(void)
 {
 	u64 ret;
-- 
2.25.1


  reply	other threads:[~2021-07-07 20:43 UTC|newest]

Thread overview: 27+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-07-07 20:42 [PATCH v2 0/6] Add TDX Guest Support (Attestation support) Kuppuswamy Sathyanarayanan
2021-07-07 20:42 ` Kuppuswamy Sathyanarayanan [this message]
2021-07-08  8:16   ` [PATCH v2 1/6] x86/tdx: Add TDREPORT TDX Module call support Xiaoyao Li
2021-07-08 14:07     ` Kuppuswamy, Sathyanarayanan
2021-07-08 14:20       ` Hans de Goede
2021-07-08 17:06         ` Kuppuswamy, Sathyanarayanan
2021-07-07 20:42 ` [PATCH v2 2/6] x86/tdx: Add GetQuote TDX hypercall support Kuppuswamy Sathyanarayanan
2021-07-07 20:42 ` [PATCH v2 3/6] x86/tdx: Add SetupEventNotifyInterrupt " Kuppuswamy Sathyanarayanan
2021-07-07 20:42 ` [PATCH v2 4/6] x86/tdx: Add TDX Guest event notify interrupt vector support Kuppuswamy Sathyanarayanan
2021-07-07 20:42 ` [PATCH v2 5/6] platform/x86: intel_tdx_attest: Add TDX Guest attestation interface driver Kuppuswamy Sathyanarayanan
2021-07-08 22:21   ` Andy Lutomirski
2021-07-08 22:35     ` Dave Hansen
2021-07-09  0:38       ` Andi Kleen
2021-07-13  0:33         ` Kuppuswamy, Sathyanarayanan
2021-07-13  0:44           ` Dave Hansen
2021-07-08 23:34     ` Kuppuswamy, Sathyanarayanan
2021-07-08 23:36   ` Dan Williams
2021-07-08 23:57     ` Kuppuswamy, Sathyanarayanan
2021-07-09  0:20       ` Dan Williams
2021-07-09  0:36         ` Andi Kleen
2021-07-09  1:37           ` Dan Williams
2021-07-09  1:44             ` Andi Kleen
2021-07-09  2:04               ` Dan Williams
2021-07-09  2:43                 ` Kuppuswamy, Sathyanarayanan
2021-07-07 20:42 ` [PATCH v2 6/6] tools/tdx: Add a sample attestation user app Kuppuswamy Sathyanarayanan
2021-07-15  8:36   ` Mian Yousaf Kaukab
2021-07-15 15:19     ` Kuppuswamy, Sathyanarayanan

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