linux-kernel - [PATCH] xen,kdump: handle pv domain in paddr_vmcoreinfo

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Message-Id: <20170330141824.4113-1-jgross@suse.com>
Date:   Thu, 30 Mar 2017 16:18:24 +0200
From:   Juergen Gross <jgross@...e.com>
To:     linux-kernel@...r.kernel.org, xen-devel@...ts.xenproject.org
Cc:     boris.ostrovsky@...cle.com, ptesarik@...e.com,
        Juergen Gross <jgross@...e.com>
Subject: [PATCH] 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() only,
but being attributed "weak" it can be replaced easily in Xen case.

Signed-off-by: Juergen Gross <jgross@...e.com>
---
This patch needs to be rebased on top of Vitaly's series to split
pv- and hvm-code. I'll do this as soon as his series is in the Xen
tree in its final form.
---
 arch/x86/xen/mmu.c | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/arch/x86/xen/mmu.c b/arch/x86/xen/mmu.c
index 37cb5aa..0e2b8d7 100644
--- a/arch/x86/xen/mmu.c
+++ b/arch/x86/xen/mmu.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>
 
@@ -2903,3 +2906,13 @@ int xen_unmap_domain_gfn_range(struct vm_area_struct *vma,
 	return -EINVAL;
 }
 EXPORT_SYMBOL_GPL(xen_unmap_domain_gfn_range);
+
+#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((unsigned long)(char *)&vmcoreinfo_note);
+}
+#endif /* CONFIG_KEXEC_CORE */
-- 
2.10.2