[Xen-devel] [PATCH] hvm: handle PoD and grant pages in HVMOP_get_mem_type

[Olaf Hering <olaf@xxxxxxxxx>]

# HG changeset patch
# User Olaf Hering <olaf@xxxxxxxxx>
# Date 1350655745 -7200
# Node ID 8ebe7b80f02900d5a83e023c2833de26b70f3ff1
# Parent  3fa2ab30bb05297f30d9a33b30f29db960900971
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>

diff -r 3fa2ab30bb05 -r 8ebe7b80f029 xen/arch/x86/hvm/hvm.c
--- a/xen/arch/x86/hvm/hvm.c
+++ b/xen/arch/x86/hvm/hvm.c
@@ -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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