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[Xen-devel] [PATCH v2 52/62] xen/pvshim: set max_pages to the value of tot_pages

From: Roger Pau Monne <roger.pau@xxxxxxxxxx>

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)

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