[PATCH v5 02/16] arm/x86/common: Add HAS_[ALTERNATIVE|EX_TABLE]

[Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>]

x86 implements all of them by default - and we just
add two extra HAS_ variables to be declared in autoconf.h.

ARM 64 only has alternative while ARM 32 has none of them.

And while at it change the livepatch common code that
would benefit from this.

Acked-by: Jan Beulich <jbeulich@suse.com> [relevant parts]
Suggested-by: Julien Grall <julien.grall@arm.com>
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>

---
Cc: Stefano Stabellini <sstabellini@kernel.org>
Cc: Julien Grall <julien.grall@arm.com>
Cc: Jan Beulich <jbeulich@suse.com>
Cc: Andrew Cooper <andrew.cooper3@citrix.com>
Cc: Doug Goldstein <cardoe@cardoe.com>

v2: First submission
v3: Move the config options to common code
    Don't include <xen/config.h> in the file.
    Don't even include <xen/kconfig.h> in the file as xen/Rules.mk automatically
    includes the config.h for every GCC invocation.
v4: Depend on "arm64: s/ALTERNATIVE/HAS_ALTERNATIVE/"
    Remove the extra newline in arch/x86/Kconfig
v5: Add Jan's Ack.
---
 xen/arch/arm/Kconfig   | 3 ---
 xen/arch/x86/Kconfig   | 2 ++
 xen/common/Kconfig     | 6 ++++++
 xen/common/livepatch.c | 4 +++-
 4 files changed, 11 insertions(+), 4 deletions(-)

diff --git a/xen/arch/arm/Kconfig b/xen/arch/arm/Kconfig
index 558d013..2e023d1 100644
--- a/xen/arch/arm/Kconfig
+++ b/xen/arch/arm/Kconfig
@@ -45,9 +45,6 @@ config ACPI
 config HAS_GICV3
 	bool
 
-config HAS_ALTERNATIVE
-	bool
-
 endmenu
 
 menu "ARM errata workaround via the alternative framework"
diff --git a/xen/arch/x86/Kconfig b/xen/arch/x86/Kconfig
index 265fd79..96ca2bf 100644
--- a/xen/arch/x86/Kconfig
+++ b/xen/arch/x86/Kconfig
@@ -7,8 +7,10 @@ config X86
 	select ACPI_LEGACY_TABLES_LOOKUP
 	select COMPAT
 	select CORE_PARKING
+	select HAS_ALTERNATIVE
 	select HAS_CPUFREQ
 	select HAS_EHCI
+	select HAS_EX_TABLE
 	select HAS_GDBSX
 	select HAS_IOPORTS
 	select HAS_KEXEC
diff --git a/xen/common/Kconfig b/xen/common/Kconfig
index 4331874..81e0017 100644
--- a/xen/common/Kconfig
+++ b/xen/common/Kconfig
@@ -11,9 +11,15 @@ config COMPAT
 config CORE_PARKING
 	bool
 
+config HAS_ALTERNATIVE
+	bool
+
 config HAS_DEVICE_TREE
 	bool
 
+config HAS_EX_TABLE
+	bool
+
 config HAS_MEM_ACCESS
 	bool
 
diff --git a/xen/common/livepatch.c b/xen/common/livepatch.c
index 5f9986d..292dd2e 100644
--- a/xen/common/livepatch.c
+++ b/xen/common/livepatch.c
@@ -643,7 +643,7 @@ static int prepare_payload(struct payload *payload,
                                   sizeof(*region->frame[i].bugs);
     }
 
-#ifndef CONFIG_ARM
+#ifdef CONFIG_HAS_ALTERNATIVE
     sec = livepatch_elf_sec_by_name(elf, ".altinstructions");
     if ( sec )
     {
@@ -674,7 +674,9 @@ static int prepare_payload(struct payload *payload,
         }
         apply_alternatives(start, end);
     }
+#endif
 
+#ifdef CONFIG_HAS_EX_TABLE
     sec = livepatch_elf_sec_by_name(elf, ".ex_table");
     if ( sec )
     {
-- 
2.4.11


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