[PATCH] nestedhvm: avoid endless loop of nested page faults

[PATCH] nestedhvm: avoid endless loop of nested page faults

[Christoph Egger]

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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>

-- 
---to satisfy European Law for business letters:
Advanced Micro Devices GmbH
Einsteinring 24, 85689 Dornach b. Muenchen
Geschaeftsfuehrer: Alberto Bozzo, Andrew Bowd
Sitz: Dornach, Gemeinde Aschheim, Landkreis Muenchen
Registergericht Muenchen, HRB Nr. 43632

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diff -r ce4768a78051 xen/arch/x86/mm/hap/nested_hap.c
--- a/xen/arch/x86/mm/hap/nested_hap.c	Mon Aug 08 11:36:21 2011 +0200
+++ b/xen/arch/x86/mm/hap/nested_hap.c	Fri Aug 19 13:28:20 2011 +0200
@@ -86,8 +86,9 @@ nestedp2m_write_p2m_entry(struct p2m_dom
 
     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);
 }

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Re: [PATCH] nestedhvm: avoid endless loop of nested page faults

[Tim Deegan]

At 14:02 +0200 on 19 Aug (1313762545), Christoph Egger wrote:
> 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>

Applied, thanks.

Tim.

-- 
Tim Deegan <tim@xen.org>
Principal Software Engineer, Xen Platform Team
Citrix Systems UK Ltd.  (Company #02937203, SL9 0BG)