From: Tim Deegan <tim@xen.org>
Date: Fri, 19 Aug 2011 12:29:27 +0000 (+0100)
Subject: nestedhvm: avoid endless loop of nested page faults
X-Git-Tag: archive/raspbian/4.8.0-1+rpi1~1^2~9954
X-Git-Url: https://dgit.raspbian.org/?a=commitdiff_plain;h=1db50df4870b5672b3fd5688cb8e6b9c1523f7c2;p=xen.git

nestedhvm: avoid endless loop of nested page faults

Stop sending IPIs to flush the nested-on-nested pagetable
after write operations. Instead flush the TLB only.
This fixes an endless loop of nested page faults after
adding an entry to the nested-on-nested pagetable.

Signed-off-by: Christoph Egger <Christoph.Egger@amd.com>
Committed-by: Tim Deegan <tim@xen.org>
---

diff --git a/xen/arch/x86/mm/hap/nested_hap.c b/xen/arch/x86/mm/hap/nested_hap.c
index 3e8a39dc2b..ebd42cef90 100644
--- a/xen/arch/x86/mm/hap/nested_hap.c
+++ b/xen/arch/x86/mm/hap/nested_hap.c
@@ -86,8 +86,9 @@ nestedp2m_write_p2m_entry(struct p2m_domain *p2m, unsigned long gfn,
 
     old_flags = l1e_get_flags(*p);
     safe_write_pte(p, new);
+
     if (old_flags & _PAGE_PRESENT)
-        nestedhvm_vmcx_flushtlb(p2m);
+        flush_tlb_mask(&p2m->p2m_dirty_cpumask);
     
     paging_unlock(d);
 }