[PATCH v1 6/6] x86/hyperv: Enable build of hypervisor crashdump collection files

Mukesh Rathor
2025-09-10T00:10:35Z

Enable build of the new files introduced in the earlier commits and add
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 | 1 +
include/asm-generic/mshyperv.h | 9 +++++++++
3 files changed, 16 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 afdbda2dd7b7..577bbd143527 100644
--- a/arch/x86/hyperv/hv_init.c
+++ b/arch/x86/hyperv/hv_init.c
@@ -510,6 +510,7 @@ void __init hyperv_init(void)
memunmap(src);

hv_remap_tsc_clocksource();
+ 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 dbd4c2f3aee3..952c221765f5 100644
--- a/include/asm-generic/mshyperv.h
+++ b/include/asm-generic/mshyperv.h
@@ -367,6 +367,15 @@ 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_asm_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