linux-kernel - [PATCH v6 1/4] x86/tests: Add tests for AMD SEV-ES #VC handling Add Kconfig options for testing AMD SEV related features.

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Date:   Fri, 18 Mar 2022 10:45:29 +0100
From:   Vasant Karasulli <vkarasulli@...e.de>
To:     linux-kernel@...r.kernel.org, jroedel@...e.de, kvm@...r.kernel.org
Cc:     bp@...en8.de, x86@...nel.org, thomas.lendacky@....com,
        varad.gautam@...e.com, Vasant Karasulli <vkarasulli@...e.de>
Subject: [PATCH v6 1/4] x86/tests: Add tests for AMD SEV-ES #VC handling Add Kconfig options for testing AMD SEV related features.

Signed-off-by: Vasant Karasulli <vkarasulli@...e.de>
---
 arch/x86/Kbuild          |  2 ++
 arch/x86/Kconfig.debug   | 16 ++++++++++++++++
 arch/x86/kernel/Makefile |  7 +++++++
 arch/x86/tests/Makefile  |  1 +
 4 files changed, 26 insertions(+)
 create mode 100644 arch/x86/tests/Makefile

diff --git a/arch/x86/Kbuild b/arch/x86/Kbuild
index f384cb1a4f7a..90470c76866a 100644
--- a/arch/x86/Kbuild
+++ b/arch/x86/Kbuild
@@ -26,5 +26,7 @@ obj-y += net/

 obj-$(CONFIG_KEXEC_FILE) += purgatory/

+obj-y += tests/
+
 # for cleaning
 subdir- += boot tools
diff --git a/arch/x86/Kconfig.debug b/arch/x86/Kconfig.debug
index d3a6f74a94bd..e4f61af66816 100644
--- a/arch/x86/Kconfig.debug
+++ b/arch/x86/Kconfig.debug
@@ -279,3 +279,19 @@ endchoice
 config FRAME_POINTER
 	depends on !UNWINDER_ORC && !UNWINDER_GUESS
 	bool
+
+config X86_TESTS
+	bool "Tests for x86"
+	help
+	    This enables building the tests under arch/x86/tests.
+
+if X86_TESTS
+config AMD_SEV_TEST_VC
+	bool "Test for AMD SEV VC exception handling"
+	depends on AMD_MEM_ENCRYPT
+	select FUNCTION_TRACER
+	select KPROBES
+	select KUNIT
+	help
+	  Enable KUnit-based testing for AMD SEV #VC exception handling.
+endif # X86_TESTS
diff --git a/arch/x86/kernel/Makefile b/arch/x86/kernel/Makefile
index 6aef9ee28a39..69472a576909 100644
--- a/arch/x86/kernel/Makefile
+++ b/arch/x86/kernel/Makefile
@@ -24,6 +24,13 @@ CFLAGS_REMOVE_sev.o = -pg
 CFLAGS_REMOVE_cc_platform.o = -pg
 endif

+# AMD_SEV_TEST_VC registers a kprobe by function name. IPA-SRA creates
+# function copies and renames them to have an .isra suffix, which breaks kprobes'
+# lookup. Build with -fno-ipa-sra for the test.
+ifdef CONFIG_AMD_SEV_TEST_VC
+CFLAGS_sev.o	+= -fno-ipa-sra
+endif
+
 KASAN_SANITIZE_head$(BITS).o				:= n
 KASAN_SANITIZE_dumpstack.o				:= n
 KASAN_SANITIZE_dumpstack_$(BITS).o			:= n
diff --git a/arch/x86/tests/Makefile b/arch/x86/tests/Makefile
new file mode 100644
index 000000000000..f66554cd5c45
--- /dev/null
+++ b/arch/x86/tests/Makefile
@@ -0,0 +1 @@
+# SPDX-License-Identifier: GPL-2.0
--
2.32.0