[PATCH v0 6/6] Hyper-V: Enable build of hypervisor crash collection files

[Mukesh Rathor <mrathor@linux.microsoft.com>]

This final commit enables build of the new files introduced in the
earlier commits and adds call to do the setup during boot.

Signed-off-by: Mukesh Rathor <mrathor@linux.microsoft.com>
---
 arch/x86/hyperv/Makefile       | 6 ++++++
 arch/x86/hyperv/hv_init.c      | 2 ++
 include/asm-generic/mshyperv.h | 9 +++++++++
 3 files changed, 17 insertions(+)

diff --git a/arch/x86/hyperv/Makefile b/arch/x86/hyperv/Makefile
index d55f494f471d..6f5d97cddd80 100644
--- a/arch/x86/hyperv/Makefile
+++ b/arch/x86/hyperv/Makefile
@@ -5,4 +5,10 @@ obj-$(CONFIG_HYPERV_VTL_MODE)	+= hv_vtl.o
 
 ifdef CONFIG_X86_64
 obj-$(CONFIG_PARAVIRT_SPINLOCKS)	+= hv_spinlock.o
+
+ ifdef CONFIG_MSHV_ROOT
+  CFLAGS_REMOVE_hv_trampoline.o += -pg
+  CFLAGS_hv_trampoline.o        += -fno-stack-protector
+  obj-$(CONFIG_CRASH_DUMP)      += hv_crash.o hv_trampoline.o
+ endif
 endif
diff --git a/arch/x86/hyperv/hv_init.c b/arch/x86/hyperv/hv_init.c
index 6919f1af2e51..e3a4650b9ec7 100644
--- a/arch/x86/hyperv/hv_init.c
+++ b/arch/x86/hyperv/hv_init.c
@@ -513,6 +513,8 @@ void __init hyperv_init(void)
 
 		/* mark ram reserved for hypervisor as owned by hypervisor */
 		hv_mark_resources();
+
+		hv_root_crash_init();
 	} else {
 		hypercall_msr.guest_physical_address = vmalloc_to_pfn(hv_hypercall_pg);
 		wrmsrq(HV_X64_MSR_HYPERCALL, hypercall_msr.as_uint64);
diff --git a/include/asm-generic/mshyperv.h b/include/asm-generic/mshyperv.h
index 1d2ad1304ad4..57cc3e0cac90 100644
--- a/include/asm-generic/mshyperv.h
+++ b/include/asm-generic/mshyperv.h
@@ -369,6 +369,15 @@ int hv_call_deposit_pages(int node, u64 partition_id, u32 num_pages);
 int hv_call_add_logical_proc(int node, u32 lp_index, u32 acpi_id);
 int hv_call_create_vp(int node, u64 partition_id, u32 vp_index, u32 flags);
 
+#if CONFIG_CRASH_DUMP
+void hv_root_crash_init(void);
+void hv_crash_asm32(void);
+void hv_crash_asm64_lbl(void);
+void hv_crash_asm32_end(void);
+#else   /* CONFIG_CRASH_DUMP */
+static inline void hv_root_crash_init(void) {}
+#endif  /* CONFIG_CRASH_DUMP */
+
 #else /* CONFIG_MSHV_ROOT */
 static inline bool hv_root_partition(void) { return false; }
 static inline bool hv_l1vh_partition(void) { return false; }
-- 
2.36.1.vfs.0.0