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Date:   Sat, 21 Jan 2023 00:15:40 +0000
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Subject: [RFC PATCH v3 29/31] KVM: selftests: TDX: Add support for TDG.VP.VEINFO.GET
From:   Ackerley Tng <ackerleytng@google.com>
To:     linux-kselftest@vger.kernel.org
Cc:     pbonzini@redhat.com, seanjc@google.com, isaku.yamahata@intel.com,
        sagis@google.com, erdemaktas@google.com, afranji@google.com,
        runanwang@google.com, shuah@kernel.org, drjones@redhat.com,
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        zhenzhong.duan@intel.com, maciej.szmigiero@oracle.com,
        like.xu@linux.intel.com, linux-kernel@vger.kernel.org,
        kvm@vger.kernel.org, Ackerley Tng <ackerleytng@google.com>
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Signed-off-by: Ackerley Tng <ackerleytng@google.com>
---
 .../selftests/kvm/include/x86_64/tdx/tdx.h    | 21 +++++++++++++++++++
 .../selftests/kvm/lib/x86_64/tdx/tdx.c        | 19 +++++++++++++++++
 2 files changed, 40 insertions(+)

diff --git a/tools/testing/selftests/kvm/include/x86_64/tdx/tdx.h b/tools/testing/selftests/kvm/include/x86_64/tdx/tdx.h
index c8e4b9ce795ea..2dfb9432c32f9 100644
--- a/tools/testing/selftests/kvm/include/x86_64/tdx/tdx.h
+++ b/tools/testing/selftests/kvm/include/x86_64/tdx/tdx.h
@@ -5,6 +5,7 @@
 #include <stdint.h>
 
 #define TDG_VP_INFO 1
+#define TDG_VP_VEINFO_GET 3
 #define TDG_MEM_PAGE_ACCEPT 6
 
 #define TDG_VP_VMCALL_GET_TD_VM_CALL_INFO 0x10000
@@ -41,4 +42,24 @@ uint64_t tdg_vp_info(uint64_t *rcx, uint64_t *rdx,
 uint64_t tdg_vp_vmcall_map_gpa(uint64_t address, uint64_t size, uint64_t *data_out);
 uint64_t tdg_mem_page_accept(uint64_t gpa, uint8_t level);
 
+/*
+ * 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.
+ *
+ * Adapted from arch/x86/include/asm/tdx.h
+ */
+struct ve_info {
+	uint64_t exit_reason;
+	uint64_t exit_qual;
+	/* Guest Linear (virtual) Address */
+	uint64_t gla;
+	/* Guest Physical Address */
+	uint64_t gpa;
+	uint32_t instr_len;
+	uint32_t instr_info;
+};
+
+uint64_t tdg_vp_veinfo_get(struct ve_info *ve);
+
 #endif // SELFTEST_TDX_TDX_H
diff --git a/tools/testing/selftests/kvm/lib/x86_64/tdx/tdx.c b/tools/testing/selftests/kvm/lib/x86_64/tdx/tdx.c
index 2ebc47e268779..11a19832758bb 100644
--- a/tools/testing/selftests/kvm/lib/x86_64/tdx/tdx.c
+++ b/tools/testing/selftests/kvm/lib/x86_64/tdx/tdx.c
@@ -210,3 +210,22 @@ uint64_t tdg_mem_page_accept(uint64_t gpa, uint8_t level)
 {
 	return __tdx_module_call(TDG_MEM_PAGE_ACCEPT, gpa | level, 0, 0, 0, NULL);
 }
+
+uint64_t tdg_vp_veinfo_get(struct ve_info *ve)
+{
+	uint64_t ret;
+	struct tdx_module_output out;
+
+	memset(&out, 0, sizeof(struct tdx_module_output));
+
+	ret = __tdx_module_call(TDG_VP_VEINFO_GET, 0, 0, 0, 0, &out);
+
+	ve->exit_reason = out.rcx;
+	ve->exit_qual   = out.rdx;
+	ve->gla         = out.r8;
+	ve->gpa         = out.r9;
+	ve->instr_len   = out.r10 & 0xffffffff;
+	ve->instr_info  = out.r10 >> 32;
+
+	return ret;
+}
-- 
2.39.0.246.g2a6d74b583-goog