Merge branch 'x86-urgent-for-linus' of git://git.kernel.org/pub/scm/l…

…inux/kernel/git/tip/tip

Pull x86 fixes from Ingo Molnar:
 "A KVM guest fix, and a kdump kernel relocation errors fix"

* 'x86-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  x86/timer: Force PIT initialization when !X86_FEATURE_ARAT
  x86/purgatory: Change compiler flags from -mcmodel=kernel to -mcmodel=large to fix kexec relocation errors

arch/x86/kernel/apic/apic.c

@@ -834,6 +834,10 @@ bool __init apic_needs_pit(void)
 	if (!boot_cpu_has(X86_FEATURE_APIC))
 		return true;
 
+	/* Virt guests may lack ARAT, but still have DEADLINE */
+	if (!boot_cpu_has(X86_FEATURE_ARAT))
+		return true;
+
 	/* Deadline timer is based on TSC so no further PIT action required */
 	if (boot_cpu_has(X86_FEATURE_TSC_DEADLINE_TIMER))
 		return false;

arch/x86/purgatory/Makefile

@@ -18,37 +18,40 @@ targets += purgatory.ro
 KASAN_SANITIZE	:= n
 KCOV_INSTRUMENT := n
 
+# These are adjustments to the compiler flags used for objects that
+# make up the standalone purgatory.ro
+
+PURGATORY_CFLAGS_REMOVE := -mcmodel=kernel
+PURGATORY_CFLAGS := -mcmodel=large -ffreestanding -fno-zero-initialized-in-bss
+
 # Default KBUILD_CFLAGS can have -pg option set when FTRACE is enabled. That
 # in turn leaves some undefined symbols like __fentry__ in purgatory and not
 # sure how to relocate those.
 ifdef CONFIG_FUNCTION_TRACER
-CFLAGS_REMOVE_sha256.o		+= $(CC_FLAGS_FTRACE)
-CFLAGS_REMOVE_purgatory.o	+= $(CC_FLAGS_FTRACE)
-CFLAGS_REMOVE_string.o		+= $(CC_FLAGS_FTRACE)
-CFLAGS_REMOVE_kexec-purgatory.o	+= $(CC_FLAGS_FTRACE)
+PURGATORY_CFLAGS_REMOVE		+= $(CC_FLAGS_FTRACE)
 endif
 
 ifdef CONFIG_STACKPROTECTOR
-CFLAGS_REMOVE_sha256.o		+= -fstack-protector
-CFLAGS_REMOVE_purgatory.o	+= -fstack-protector
-CFLAGS_REMOVE_string.o		+= -fstack-protector
-CFLAGS_REMOVE_kexec-purgatory.o	+= -fstack-protector
+PURGATORY_CFLAGS_REMOVE		+= -fstack-protector
 endif
 
 ifdef CONFIG_STACKPROTECTOR_STRONG
-CFLAGS_REMOVE_sha256.o		+= -fstack-protector-strong
-CFLAGS_REMOVE_purgatory.o	+= -fstack-protector-strong
-CFLAGS_REMOVE_string.o		+= -fstack-protector-strong
-CFLAGS_REMOVE_kexec-purgatory.o	+= -fstack-protector-strong
+PURGATORY_CFLAGS_REMOVE		+= -fstack-protector-strong
 endif
 
 ifdef CONFIG_RETPOLINE
-CFLAGS_REMOVE_sha256.o		+= $(RETPOLINE_CFLAGS)
-CFLAGS_REMOVE_purgatory.o	+= $(RETPOLINE_CFLAGS)
-CFLAGS_REMOVE_string.o		+= $(RETPOLINE_CFLAGS)
-CFLAGS_REMOVE_kexec-purgatory.o	+= $(RETPOLINE_CFLAGS)
+PURGATORY_CFLAGS_REMOVE		+= $(RETPOLINE_CFLAGS)
 endif
 
+CFLAGS_REMOVE_purgatory.o	+= $(PURGATORY_CFLAGS_REMOVE)
+CFLAGS_purgatory.o		+= $(PURGATORY_CFLAGS)
+
+CFLAGS_REMOVE_sha256.o		+= $(PURGATORY_CFLAGS_REMOVE)
+CFLAGS_sha256.o			+= $(PURGATORY_CFLAGS)
+
+CFLAGS_REMOVE_string.o		+= $(PURGATORY_CFLAGS_REMOVE)
+CFLAGS_string.o			+= $(PURGATORY_CFLAGS)
+
 $(obj)/purgatory.ro: $(PURGATORY_OBJS) FORCE
 		$(call if_changed,ld)