[Xen-changelog] [xen stable-4.10] xen/pvshim: set max_pages to the value of tot_pages

[patchbot@xxxxxxx]

commit 004646a1dd4ff2f768d942689545dd3b6e2135e2
Author:     Roger Pau Monne <roger.pau@xxxxxxxxxx>
AuthorDate: Thu Jan 11 11:41:20 2018 +0000
Commit:     Roger Pau Monne <roger.pau@xxxxxxxxxx>
CommitDate: Fri Jan 12 15:47:32 2018 +0000

    xen/pvshim: set max_pages to the value of tot_pages
    
    So that the guest is not able to deplete the memory pool of the shim
    itself by trying to balloon up.
    
    Signed-off-by: Roger Pau Monné <roger.pau@xxxxxxxxxx>
    Acked-by: Jan Beulich <jbeulich@xxxxxxxx>
---
 xen/arch/x86/pv/shim.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/xen/arch/x86/pv/shim.c b/xen/arch/x86/pv/shim.c
index 6dc1ee45d7..e3e101a5b1 100644
--- a/xen/arch/x86/pv/shim.c
+++ b/xen/arch/x86/pv/shim.c
@@ -204,6 +204,12 @@ void __init pv_shim_setup_dom(struct domain *d, 
l4_pgentry_t *l4start,
                                (hypercall_fn_t *)pv_shim_grant_table_op,
                                (hypercall_fn_t *)pv_shim_grant_table_op);
     guest = d;
+
+    /*
+     * Set the max pages to the current number of pages to prevent the
+     * guest from depleting the shim memory pool.
+     */
+    d->max_pages = d->tot_pages;
 }
 
 static void write_start_info(struct domain *d)
--
generated by git-patchbot for /home/xen/git/xen.git#stable-4.10

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