[Xen-changelog] [xen-unstable] hvm: handle PoD and grant pages in HVMOP_get_mem_type

[Xen patchbot-unstable <patchbot@xxxxxxx>]

# HG changeset patch
# User Olaf Hering <olaf@xxxxxxxxx>
# Date 1350655745 -7200
# Node ID 4ae08ca5500f68d19a689c06489024157300d7b0
# Parent  478ba3f146df23d2cfa95fc603d0b4b9d21ba15d
hvm: handle PoD and grant pages in HVMOP_get_mem_type

During kexec in a ballooned PVonHVM guest the new kernel needs to check
each pfn if its backed by a mfn to find ballooned pages. Currently all
PoD and grant pages will appear as HVMMEM_mmio_dm, so the new kernel has
to assume they are ballooned. This is wrong: PoD pages may turn into
real RAM at runtime, grant pages are also RAM.

Signed-off-by: Olaf Hering <olaf@xxxxxxxxx>
Acked-by: Tim Deegan <tim@xxxxxxx>
Committed-by: Tim Deegan <tim@xxxxxxx>
---


diff -r 478ba3f146df -r 4ae08ca5500f xen/arch/x86/hvm/hvm.c
--- a/xen/arch/x86/hvm/hvm.c    Fri Oct 19 16:51:24 2012 +0200
+++ b/xen/arch/x86/hvm/hvm.c    Fri Oct 19 16:09:05 2012 +0200
@@ -4086,6 +4086,10 @@ long do_hvm_op(unsigned long op, XEN_GUE
                 a.mem_type =  HVMMEM_ram_ro;
             else if ( p2m_is_ram(t) )
                 a.mem_type =  HVMMEM_ram_rw;
+            else if ( p2m_is_magic(t) )
+                a.mem_type =  HVMMEM_ram_rw;
+            else if ( p2m_is_grant(t) )
+                a.mem_type =  HVMMEM_ram_rw;
             else
                 a.mem_type =  HVMMEM_mmio_dm;
             rc = copy_to_guest(arg, &a, 1) ? -EFAULT : 0;

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