netdev - [PATCH v2 2/6] x86/tdx: Add GetQuote TDX hypercall support

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Date:   Wed,  7 Jul 2021 13:42:45 -0700
From:   Kuppuswamy Sathyanarayanan 
        <sathyanarayanan.kuppuswamy@...ux.intel.com>
To:     Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        Peter Zijlstra <peterz@...radead.org>,
        Andy Lutomirski <luto@...nel.org>,
        Hans de Goede <hdegoede@...hat.com>,
        Mark Gross <mgross@...ux.intel.com>,
        Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Andrii Nakryiko <andrii@...nel.org>
Cc:     Peter H Anvin <hpa@...or.com>, Dave Hansen <dave.hansen@...el.com>,
        Tony Luck <tony.luck@...el.com>,
        Dan Williams <dan.j.williams@...el.com>,
        Andi Kleen <ak@...ux.intel.com>,
        Kirill Shutemov <kirill.shutemov@...ux.intel.com>,
        Sean Christopherson <seanjc@...gle.com>,
        Kuppuswamy Sathyanarayanan <knsathya@...nel.org>,
        x86@...nel.org, linux-kernel@...r.kernel.org,
        platform-driver-x86@...r.kernel.org, bpf@...r.kernel.org,
        netdev@...r.kernel.org
Subject: [PATCH v2 2/6] x86/tdx: Add GetQuote TDX hypercall support

The second stage in the attestation process is for the guest to
request the VMM generate and sign a quote based on the TDREPORT
acquired earlier.

Add tdx_hcall_get_quote() helper function to implement the GetQuote
hypercall.

More details about the GetQuote TDVMCALL are in the Guest-Host
Communication Interface (GHCI) Specification, sec 3.3, titled
"TDG.VP.VMCALL<GetQuote>".

This will be used by the TD attestation driver in follow-on patches.

Reviewed-by: Tony Luck <tony.luck@...el.com>
Reviewed-by: Andi Kleen <ak@...ux.intel.com>
Signed-off-by: Kuppuswamy Sathyanarayanan <sathyanarayanan.kuppuswamy@...ux.intel.com>
---
 arch/x86/include/asm/tdx.h |  2 ++
 arch/x86/kernel/tdx.c      | 30 ++++++++++++++++++++++++++++++
 2 files changed, 32 insertions(+)

diff --git a/arch/x86/include/asm/tdx.h b/arch/x86/include/asm/tdx.h
index 4f1b5c14a09b..1599aa4850e5 100644
--- a/arch/x86/include/asm/tdx.h
+++ b/arch/x86/include/asm/tdx.h
@@ -98,6 +98,8 @@ bool tdg_filter_enabled(void);
 
 int tdx_mcall_tdreport(u64 data, u64 reportdata);
 
+int tdx_hcall_get_quote(u64 data);
+
 /*
  * 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 0f797803f4c8..eb3a90051604 100644
--- a/arch/x86/kernel/tdx.c
+++ b/arch/x86/kernel/tdx.c
@@ -28,6 +28,7 @@
 
 /* TDX hypercall Leaf IDs */
 #define TDVMCALL_MAP_GPA		0x10001
+#define TDVMCALL_GET_QUOTE		0x10002
 
 /* TDX Module call error codes */
 #define TDX_PAGE_ALREADY_ACCEPTED       0x8000000000000001
@@ -36,6 +37,9 @@
 #define TDCALL_INVALID_OPERAND		0x8000000000000000
 #define TDCALL_RETURN_CODE(a)		((a) & TDCALL_RETURN_CODE_MASK)
 
+/* TDX hypercall error codes */
+#define TDVMCALL_INVALID_OPERAND	0x8000000000000000
+#define TDVMCALL_TDREPORT_FAILED	0x8000000000000001
 
 #define VE_IS_IO_OUT(exit_qual)		(((exit_qual) & 8) ? 0 : 1)
 #define VE_GET_IO_SIZE(exit_qual)	(((exit_qual) & 7) + 1)
@@ -172,6 +176,32 @@ int tdx_mcall_tdreport(u64 data, u64 reportdata)
 }
 EXPORT_SYMBOL_GPL(tdx_mcall_tdreport);
 
+/*
+ * tdx_hcall_get_quote() - Generate TDQUOTE using TDREPORT_STRUCT.
+ *
+ * @data        : Physical address of 4KB GPA memory which contains
+ *                TDREPORT_STRUCT.
+ *
+ * return 0 on success or failure error number.
+ */
+int tdx_hcall_get_quote(u64 data)
+{
+	u64 ret;
+
+	if (!data || !prot_guest_has(PR_GUEST_TDX))
+		return -EINVAL;
+
+	ret = _trace_tdx_hypercall(TDVMCALL_GET_QUOTE, data, 0, 0, 0, NULL);
+
+	if (ret == TDVMCALL_INVALID_OPERAND)
+		return -EINVAL;
+	else if (ret == TDVMCALL_TDREPORT_FAILED)
+		return -EBUSY;
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(tdx_hcall_get_quote);
+
 static void tdg_get_info(void)
 {
 	u64 ret;
-- 
2.25.1