1.1 --- a/linux-2.6.10-xen-sparse/arch/xen/Kconfig	Tue Mar 15 14:50:10 2005 +0000
     1.2 +++ b/linux-2.6.10-xen-sparse/arch/xen/Kconfig	Tue Mar 15 15:53:52 2005 +0000
     1.3 @@ -146,6 +146,12 @@ config XEN_BATCH_MODE2
     1.4        we only use this for benchmarking
     1.5        enable only if you know what you are doing
     1.6  
     1.7 +config XEN_SHADOW_MODE
     1.8 +	bool "Fake shadow mode"
     1.9 +	default n
    1.10 +    help
    1.11 +      fakes out a shadow mode kernel
    1.12 +
    1.13  
    1.14  config XEN_SCRUB_PAGES
    1.15  	bool "Scrub memory before freeing it to Xen"

     2.1 --- a/linux-2.6.10-xen-sparse/arch/xen/i386/mm/hypervisor.c	Tue Mar 15 14:50:10 2005 +0000
     2.2 +++ b/linux-2.6.10-xen-sparse/arch/xen/i386/mm/hypervisor.c	Tue Mar 15 15:53:52 2005 +0000
     2.3 @@ -125,6 +125,7 @@ static inline void increment_index_and_f
     2.4  
     2.5  void queue_l1_entry_update(pte_t *ptr, unsigned long val)
     2.6  {
     2.7 +#ifndef CONFIG_XEN_SHADOW_MODE
     2.8      int cpu = smp_processor_id();
     2.9      int idx;
    2.10      unsigned long flags;
    2.11 @@ -137,10 +138,15 @@ void queue_l1_entry_update(pte_t *ptr, u
    2.12      __flush_page_update_queue();
    2.13  #endif
    2.14      spin_unlock_irqrestore(&update_lock, flags);
    2.15 +#else
    2.16 +    _flush_page_update_queue();
    2.17 +    *(unsigned long *)ptr = val;
    2.18 +#endif
    2.19  }
    2.20  
    2.21  void queue_l2_entry_update(pmd_t *ptr, unsigned long val)
    2.22  {
    2.23 +#ifndef CONFIG_XEN_SHADOW_MODE
    2.24      int cpu = smp_processor_id();
    2.25      int idx;
    2.26      unsigned long flags;
    2.27 @@ -150,6 +156,10 @@ void queue_l2_entry_update(pmd_t *ptr, u
    2.28      per_cpu(update_queue[idx], cpu).val = val;
    2.29      increment_index();
    2.30      spin_unlock_irqrestore(&update_lock, flags);
    2.31 +#else
    2.32 +    _flush_page_update_queue();
    2.33 +    *(unsigned long *)ptr = val;
    2.34 +#endif
    2.35  }
    2.36  
    2.37  void queue_pt_switch(unsigned long ptr)
    2.38 @@ -278,6 +288,7 @@ void queue_machphys_update(unsigned long
    2.39  /* queue and flush versions of the above */
    2.40  void xen_l1_entry_update(pte_t *ptr, unsigned long val)
    2.41  {
    2.42 +#ifndef CONFIG_XEN_SHADOW_MODE
    2.43      int cpu = smp_processor_id();
    2.44      int idx;
    2.45      unsigned long flags;
    2.46 @@ -287,10 +298,14 @@ void xen_l1_entry_update(pte_t *ptr, uns
    2.47      per_cpu(update_queue[idx], cpu).val = val;
    2.48      increment_index_and_flush();
    2.49      spin_unlock_irqrestore(&update_lock, flags);
    2.50 +#else
    2.51 +    *(unsigned long *)ptr = val;
    2.52 +#endif
    2.53  }
    2.54  
    2.55  void xen_l2_entry_update(pmd_t *ptr, unsigned long val)
    2.56  {
    2.57 +#ifndef CONFIG_XEN_SHADOW_MODE
    2.58      int cpu = smp_processor_id();
    2.59      int idx;
    2.60      unsigned long flags;
    2.61 @@ -300,6 +315,9 @@ void xen_l2_entry_update(pmd_t *ptr, uns
    2.62      per_cpu(update_queue[idx], cpu).val = val;
    2.63      increment_index_and_flush();
    2.64      spin_unlock_irqrestore(&update_lock, flags);
    2.65 +#else
    2.66 +    *(unsigned long *)ptr = val;
    2.67 +#endif
    2.68  }
    2.69  
    2.70  void xen_pt_switch(unsigned long ptr)

     3.1 --- a/linux-2.6.10-xen-sparse/arch/xen/i386/mm/init.c	Tue Mar 15 14:50:10 2005 +0000
     3.2 +++ b/linux-2.6.10-xen-sparse/arch/xen/i386/mm/init.c	Tue Mar 15 15:53:52 2005 +0000
     3.3 @@ -77,7 +77,9 @@ static pte_t * __init one_page_table_ini
     3.4  {
     3.5  	if (pmd_none(*pmd)) {
     3.6  		pte_t *page_table = (pte_t *) alloc_bootmem_low_pages(PAGE_SIZE);
     3.7 +#ifndef CONFIG_XEN_SHADOW_MODE
     3.8  		make_page_readonly(page_table);
     3.9 +#endif
    3.10  		set_pmd(pmd, __pmd(__pa(page_table) | _PAGE_TABLE));
    3.11  		if (page_table != pte_offset_kernel(pmd, 0))
    3.12  			BUG();	
    3.13 @@ -349,7 +351,9 @@ static void __init pagetable_init (void)
    3.14  	 * it. We clean up by write-enabling and then freeing the old page dir.
    3.15  	 */
    3.16  	memcpy(new_pgd, old_pgd, PTRS_PER_PGD_NO_HV*sizeof(pgd_t));
    3.17 +#ifndef CONFIG_XEN_SHADOW_MODE
    3.18  	make_page_readonly(new_pgd);
    3.19 +#endif
    3.20  	queue_pgd_pin(__pa(new_pgd));
    3.21  	load_cr3(new_pgd);
    3.22  	queue_pgd_unpin(__pa(old_pgd));

     4.1 --- a/linux-2.6.10-xen-sparse/arch/xen/i386/mm/pgtable.c	Tue Mar 15 14:50:10 2005 +0000
     4.2 +++ b/linux-2.6.10-xen-sparse/arch/xen/i386/mm/pgtable.c	Tue Mar 15 15:53:52 2005 +0000
     4.3 @@ -181,7 +181,9 @@ pte_t *pte_alloc_one_kernel(struct mm_st
     4.4  	pte_t *pte = (pte_t *)__get_free_page(GFP_KERNEL|__GFP_REPEAT);
     4.5  	if (pte) {
     4.6  		clear_page(pte);
     4.7 +#ifndef CONFIG_XEN_SHADOW_MODE
     4.8  		make_page_readonly(pte);
     4.9 +#endif
    4.10  		xen_flush_page_update_queue();
    4.11  	}
    4.12  	return pte;
    4.13 @@ -194,7 +196,9 @@ void pte_ctor(void *pte, kmem_cache_t *c
    4.14  	set_page_count(page, 1);
    4.15  
    4.16  	clear_page(pte);
    4.17 +#ifndef CONFIG_XEN_SHADOW_MODE
    4.18  	make_page_readonly(pte);
    4.19 +#endif
    4.20  	queue_pte_pin(__pa(pte));
    4.21  	flush_page_update_queue();
    4.22  }
    4.23 @@ -304,7 +308,9 @@ void pgd_ctor(void *pgd, kmem_cache_t *c
    4.24  	spin_unlock_irqrestore(&pgd_lock, flags);
    4.25  	memset(pgd, 0, USER_PTRS_PER_PGD*sizeof(pgd_t));
    4.26   out:
    4.27 +#ifndef CONFIG_XEN_SHADOW_MODE
    4.28  	make_page_readonly(pgd);
    4.29 +#endif
    4.30  	queue_pgd_pin(__pa(pgd));
    4.31  	flush_page_update_queue();
    4.32  }