Hello Sergej,
On 04/07/16 12:45, Sergej Proskurin wrote:
+static inline
+int p2m_set_altp2m_mem_access(struct domain *d, struct p2m_domain *hp2m,
+ struct p2m_domain *ap2m, p2m_access_t a,
+ gfn_t gfn)
+{
[...]
+ /* Set mem access attributes - currently supporting only one (4K) page. */
+ mask = level_masks[3];
+ return apply_p2m_changes(d, ap2m, INSERT,
+ gpa & mask,
+ (gpa + level_sizes[level]) & mask,
+ maddr & mask, mattr, 0, p2mt, a);
The operation INSERT will remove the previous mapping and decrease page
reference for foreign mapping (see p2m_put_l3_page). So if you set the
memory access for this kind of page, the reference count will be wrong
afterward.
--
Julien Grall
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