[Xen-changelog] [mini-os master] mini-os: remap p2m list in case of ballooning

[patchbot@xxxxxxx]

commit dbd00323702911b73e8f04f92a9d1e26c1159bf1
Author:     Juergen Gross <jgross@xxxxxxxx>
AuthorDate: Mon Aug 1 09:26:08 2016 +0200
Commit:     Juergen Gross <jgross@xxxxxxxx>
CommitDate: Thu Aug 11 13:04:12 2016 +0200

    mini-os: remap p2m list in case of ballooning
    
    In case of enabled ballooning we must be prepared for a growing p2m
    list. If the maximum memory size of the domain can't be covered by the
    actual p2m list remap it to the kernel virtual mapping area and leave
    enough space at the end.
    
    Signed-off-by: Juergen Gross <jgross@xxxxxxxx>
    Reviewed-by: Samuel Thibault <samuel.thibault@xxxxxxxxxxxx>
---
 arch/arm/balloon.c    |  2 ++
 arch/x86/balloon.c    | 25 +++++++++++++++++++++++++
 arch/x86/mm.c         |  3 +++
 include/balloon.h     |  3 +++
 include/x86/arch_mm.h |  4 ++++
 5 files changed, 37 insertions(+)

diff --git a/arch/arm/balloon.c b/arch/arm/balloon.c
index 28021d6..549e51b 100644
--- a/arch/arm/balloon.c
+++ b/arch/arm/balloon.c
@@ -25,4 +25,6 @@
 
 #ifdef CONFIG_BALLOON
 
+unsigned long virt_kernel_area_end;   /* TODO: find a virtual area */
+
 #endif
diff --git a/arch/x86/balloon.c b/arch/x86/balloon.c
index 28021d6..a7f20e4 100644
--- a/arch/x86/balloon.c
+++ b/arch/x86/balloon.c
@@ -21,8 +21,33 @@
  * DEALINGS IN THE SOFTWARE.
  */
 
+#include <mini-os/os.h>
 #include <mini-os/balloon.h>
+#include <mini-os/lib.h>
+#include <mini-os/mm.h>
 
 #ifdef CONFIG_BALLOON
 
+unsigned long virt_kernel_area_end = VIRT_KERNEL_AREA;
+
+void arch_remap_p2m(unsigned long max_pfn)
+{
+    unsigned long pfn;
+
+    if ( p2m_pages(nr_max_pages) <= p2m_pages(max_pfn) )
+        return;
+
+    for ( pfn = 0; pfn < max_pfn; pfn += P2M_ENTRIES )
+    {
+        map_frame_rw(virt_kernel_area_end + PAGE_SIZE * (pfn / P2M_ENTRIES),
+                     virt_to_mfn(phys_to_machine_mapping + pfn));
+    }
+
+    phys_to_machine_mapping = (unsigned long *)virt_kernel_area_end;
+    printk("remapped p2m list to %p\n", phys_to_machine_mapping);
+
+    virt_kernel_area_end += PAGE_SIZE * p2m_pages(nr_max_pages);
+    ASSERT(virt_kernel_area_end <= VIRT_DEMAND_AREA);
+}
+
 #endif
diff --git a/arch/x86/mm.c b/arch/x86/mm.c
index a5c8959..8fa3b4c 100644
--- a/arch/x86/mm.c
+++ b/arch/x86/mm.c
@@ -37,6 +37,7 @@
 #include <mini-os/errno.h>
 #include <mini-os/os.h>
 #include <mini-os/hypervisor.h>
+#include <mini-os/balloon.h>
 #include <mini-os/mm.h>
 #include <mini-os/types.h>
 #include <mini-os/lib.h>
@@ -626,6 +627,8 @@ void arch_init_p2m(unsigned long max_pfn)
     HYPERVISOR_shared_info->arch.pfn_to_mfn_frame_list_list = 
         virt_to_mfn(l3_list);
     HYPERVISOR_shared_info->arch.max_pfn = max_pfn;
+
+    arch_remap_p2m(max_pfn);
 }
 
 void arch_init_mm(unsigned long* start_pfn_p, unsigned long* max_pfn_p)
diff --git a/include/balloon.h b/include/balloon.h
index cd79017..b0d0ebf 100644
--- a/include/balloon.h
+++ b/include/balloon.h
@@ -27,12 +27,15 @@
 #ifdef CONFIG_BALLOON
 
 extern unsigned long nr_max_pages;
+extern unsigned long virt_kernel_area_end;
 
 void get_max_pages(void);
+void arch_remap_p2m(unsigned long max_pfn);
 
 #else /* CONFIG_BALLOON */
 
 static inline void get_max_pages(void) { }
+static inline void arch_remap_p2m(unsigned long max_pfn) { }
 
 #endif /* CONFIG_BALLOON */
 #endif /* _BALLOON_H_ */
diff --git a/include/x86/arch_mm.h b/include/x86/arch_mm.h
index 7283f64..e5d9c57 100644
--- a/include/x86/arch_mm.h
+++ b/include/x86/arch_mm.h
@@ -198,6 +198,10 @@ static inline void p2m_chk_pfn(unsigned long pfn)
         do_exit();
     }
 }
+static inline unsigned long p2m_pages(unsigned long pages)
+{
+    return (pages + P2M_ENTRIES - 1) >> L1_P2M_SHIFT;
+}
 
 #include "arch_limits.h"
 #define PAGE_SIZE       __PAGE_SIZE
--
generated by git-patchbot for /home/xen/git/mini-os.git#master

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