Creates the patchfile which corrects a (memory) bug of the paravirtualization
feature in kernel 2.6.25 (which got corrected later in 2.6.29) (File
998-paravirt_release_pmd.patch, which I send as standalone in 2/2)
Signed-off-by: Alexander Stadler <sa.maillists at univie.ac.at>
------
diff -urN
a/8.09/target/linux/generic-2.6/patches-2.6.25/998-paravirt_release_pmd.patch
b/8.09/target/linux/generic-2.6/patches-2.6.25/998-paravirt_release_pmd.patch
---
a/8.09/target/linux/generic-2.6/patches-2.6.25/998-paravirt_release_pmd.patch
1970-01-01 01:00:00.000000000 +0100
+++
b/8.09/target/linux/generic-2.6/patches-2.6.25/998-paravirt_release_pmd.patch
2009-04-03 15:10:30.000000000 +0200
@@ -0,0 +1,107 @@
+diff -urN openwrt-8.09/arch/x86/xen/enlighten.c
openwrt/arch/x86/xen/enlighten.c
+--- a/arch/x86/xen/enlighten.c 2008-09-08 12:20:51.000000000 +0200
++++ b/arch/x86/xen/enlighten.c 2009-04-03 14:27:56.000000000 +0200
+@@ -1059,6 +1059,8 @@
+ .pte_update = paravirt_nop,
+ .pte_update_defer = paravirt_nop,
+
++ .pgd_free = paravirt_nop,
++
+ .alloc_pt = xen_alloc_pt_init,
+ .release_pt = xen_release_pt_init,
+ .alloc_pd = xen_alloc_pt_init,
+diff -urN openwrt-8.09/arch/x86/kernel/paravirt.c
openwrt/arch/x86/kernel/paravirt.c
+--- a/arch/x86/kernel/paravirt.c 2008-09-08 12:20:51.000000000 +0200
++++ b/arch/x86/kernel/paravirt.c 2009-04-03 14:27:56.000000000 +0200
+@@ -382,6 +382,8 @@
+ .flush_tlb_single = native_flush_tlb_single,
+ .flush_tlb_others = native_flush_tlb_others,
+
++ .pgd_free = paravirt_nop,
++
+ .alloc_pt = paravirt_nop,
+ .alloc_pd = paravirt_nop,
+ .alloc_pd_clone = paravirt_nop,
+diff -urN openwrt-8.09/include/asm-x86/paravirt.h
openwrt/include/asm-x86/paravirt.h
+--- a/include/asm-x86/paravirt.h 2008-09-08 12:20:51.000000000 +0200
++++ b/include/asm-x86/paravirt.h 2009-04-03 14:27:56.000000000 +0200
+@@ -219,6 +219,9 @@
+ void (*flush_tlb_others)(const cpumask_t *cpus, struct mm_struct *mm,
+ unsigned long va);
+
++ /* Hook for freeing a pagetable top-level */
++ void (*pgd_free) (struct mm_struct *mm, pgd_t *pgd);
++
+ /* Hooks for allocating/releasing pagetable pages */
+ void (*alloc_pt)(struct mm_struct *mm, u32 pfn);
+ void (*alloc_pd)(struct mm_struct *mm, u32 pfn);
+@@ -894,6 +897,11 @@
+ PVOP_VCALL3(pv_mmu_ops.flush_tlb_others, &cpumask, mm, va);
+ }
+
++static inline void paravirt_pgd_free(struct mm_struct *mm, pgd_t *pgd)
++{
++ PVOP_VCALL2(pv_mmu_ops.pgd_free, mm, pgd);
++}
++
+ static inline void paravirt_alloc_pt(struct mm_struct *mm, unsigned pfn)
+ {
+ PVOP_VCALL2(pv_mmu_ops.alloc_pt, mm, pfn);
+diff -urN openwrt-8.09/include/asm-x86/pgalloc_32.h
openwrt/include/asm-x86/pgalloc_32.h
+--- a/include/asm-x86/pgalloc_32.h 2008-09-08 12:20:51.000000000 +0200
++++ b/include/asm-x86/pgalloc_32.h 2009-04-03 14:27:56.000000000 +0200
+@@ -13,6 +13,7 @@
+ #define paravirt_alloc_pt(mm, pfn) do { } while (0)
+ #define paravirt_alloc_pd(mm, pfn) do { } while (0)
+ #define paravirt_alloc_pd_clone(pfn, clonepfn, start, count) do { } while (0)
++#define paravirt_pgd_free(mm, pgd) do { } while (0)
+ #define paravirt_release_pt(pfn) do { } while (0)
+ #define paravirt_release_pd(pfn) do { } while (0)
+ #endif
+diff -urN openwrt-8.09/arch/x86/mm/pgtable_32.c
openwrt/arch/x86/mm/pgtable_32.c
+--- a/arch/x86/mm/pgtable_32.c 2008-09-08 12:20:51.000000000 +0200
++++ b/arch/x86/mm/pgtable_32.c 2009-04-03 14:27:56.000000000 +0200
+@@ -351,6 +351,7 @@
+
+ if (pgd && !pgd_prepopulate_pmd(mm, pgd)) {
+ pgd_dtor(pgd);
++ paravirt_pgd_free(mm, pgd);
+ free_page((unsigned long)pgd);
+ pgd = NULL;
+ }
+@@ -362,6 +363,7 @@
+ {
+ pgd_mop_up_pmds(mm, pgd);
+ pgd_dtor(pgd);
++ paravirt_pgd_free(mm, pgd);
+ free_page((unsigned long)pgd);
+ }
+
+diff -urN openwrt-8.09/arch/x86/kernel/vmi_32.c
openwrt/arch/x86/kernel/vmi_32.c
+--- a/arch/x86/kernel/vmi_32.c 2008-09-08 12:20:51.000000000 +0200
++++ b/arch/x86/kernel/vmi_32.c 2009-04-03 14:27:56.000000000 +0200
+@@ -428,6 +428,16 @@
+ vmi_set_page_type(pfn, VMI_PAGE_NORMAL);
+ }
+
++/*
++ * We use the pgd_free hook for releasing the pgd page:
++ */
++static void vmi_pgd_free(struct mm_struct *mm, pgd_t *pgd)
++{
++ unsigned long pfn = __pa(pgd) >> PAGE_SHIFT;
++
++ vmi_ops.release_page(pfn, VMI_PAGE_L2);
++}
++
+ /*
+ * Helper macros for MMU update flags. We can defer updates until a flush
+ * or page invalidation only if the update is to the current address space
+@@ -880,6 +890,7 @@
+ if (vmi_ops.release_page) {
+ pv_mmu_ops.release_pt = vmi_release_pt;
+ pv_mmu_ops.release_pd = vmi_release_pd;
++ pv_mmu_ops.pgd_free = vmi_pgd_free;
+ }
+
+ /* Set linear is needed in all cases */
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