xen,kdump: handle pv domain in paddr_vmcoreinfo_note()

For kdump to work correctly it needs the physical address of vmcoreinfo_note. When running as dom0 this means the virtual address has to be translated to the related machine address. paddr_vmcoreinfo_note() is meant to do the translation via __pa_symbol() only, but being attributed "weak" it can be replaced easily in Xen case. Signed-off-by: Juergen Gross <[email protected]> Tested-by: Petr Tesarik <[email protected]> Reviewed-by: Boris Ostrovsky <[email protected]> Reviewed-by: Daniel Kiper <[email protected]> Signed-off-by: Juergen Gross <[email protected]>
jimmycarry · May 2, 2017 · 29985b0 · 29985b0
1 parent 8945c08
commit 29985b0
Showing 1 changed file with 13 additions and 0 deletions.
diff --git a/arch/x86/xen/mmu_pv.c b/arch/x86/xen/mmu_pv.c
@@ -49,6 +49,9 @@
 #include <linux/memblock.h>
 #include <linux/seq_file.h>
 #include <linux/crash_dump.h>
+#ifdef CONFIG_KEXEC_CORE
+#include <linux/kexec.h>
+#endif
 
 #include <trace/events/xen.h>
 
@@ -2715,3 +2718,13 @@ void xen_destroy_contiguous_region(phys_addr_t pstart, unsigned int order)
 	spin_unlock_irqrestore(&xen_reservation_lock, flags);
 }
 EXPORT_SYMBOL_GPL(xen_destroy_contiguous_region);
+
+#ifdef CONFIG_KEXEC_CORE
+phys_addr_t paddr_vmcoreinfo_note(void)
+{
+	if (xen_pv_domain())
+		return virt_to_machine(&vmcoreinfo_note).maddr;
+	else
+		return __pa_symbol(&vmcoreinfo_note);
+}
+#endif /* CONFIG_KEXEC_CORE */