[PATCH v2 07/16] Save/Restore Support: Add unmap_shared_info

[Bruno Alvisio <bruno.alvisio@gmail.com>]

This function is necessary as part of the pre-suspend operation.

Signed-off-by: Bruno Alvisio <bruno.alvisio@gmail.com>
Reviewed-by: Samuel Thibault <samuel.thibault@ens-lyon.org>
---
Changed since v1:
 * Changed HYPERVISOR_shared_info for shared_info
---
 arch/x86/setup.c     | 12 ++++++++++++
 hypervisor.c         | 12 ++++++++++++
 include/hypervisor.h |  1 +
 3 files changed, 25 insertions(+)

diff --git a/arch/x86/setup.c b/arch/x86/setup.c
index 31fa2c6..b6e0541 100644
--- a/arch/x86/setup.c
+++ b/arch/x86/setup.c
@@ -93,6 +93,18 @@ shared_info_t *map_shared_info(void *p)
     return (shared_info_t *)shared_info;
 }
 
+void unmap_shared_info(void)
+{
+    int rc;
+
+    if ( (rc = HYPERVISOR_update_va_mapping((unsigned long)shared_info,
+            __pte((virt_to_mfn(shared_info)<<L1_PAGETABLE_SHIFT)| L1_PROT), UVMF_INVLPG)) )
+    {
+        printk("Failed to unmap shared_info page!! rc=%d\n", rc);
+        do_exit();
+    }
+}
+
 static void get_cmdline(void *p)
 {
     start_info_t *si = p;
diff --git a/hypervisor.c b/hypervisor.c
index 1647121..d3857e7 100644
--- a/hypervisor.c
+++ b/hypervisor.c
@@ -78,6 +78,18 @@ shared_info_t *map_shared_info(void *p)
 
     return &shared_info;
 }
+
+void unmap_shared_info(void)
+{
+    struct xen_remove_from_physmap xrtp;
+
+    xrtp.domid = DOMID_SELF;
+    xrtp.gpfn = virt_to_pfn(&shared_info);
+    if ( HYPERVISOR_memory_op(XENMEM_remove_from_physmap, &xrtp) != 0 )
+        BUG();
+
+    return;
+}
 #endif
 
 void do_hypervisor_callback(struct pt_regs *regs)
diff --git a/include/hypervisor.h b/include/hypervisor.h
index f3b1f3c..1d09271 100644
--- a/include/hypervisor.h
+++ b/include/hypervisor.h
@@ -43,6 +43,7 @@ int hvm_get_parameter(int idx, uint64_t *value);
 int hvm_set_parameter(int idx, uint64_t value);
 #endif
 shared_info_t *map_shared_info(void *p);
+void unmap_shared_info(void);
 void force_evtchn_callback(void);
 void do_hypervisor_callback(struct pt_regs *regs);
 void mask_evtchn(uint32_t port);
-- 
2.3.2 (Apple Git-55)


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