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Re: [Xen-devel] [PATCH] x86-64: use 1Gb pages in 1:1 mapping if availabl

To: Jan Beulich <jbeulich@xxxxxxxxxx>, <xen-devel@xxxxxxxxxxxxxxxxxxx>
Subject: Re: [Xen-devel] [PATCH] x86-64: use 1Gb pages in 1:1 mapping if available
From: Keir Fraser <Keir.Fraser@xxxxxxxxxxxx>
Date: Thu, 24 Jan 2008 15:16:28 +0000
Delivery-date: Thu, 24 Jan 2008 07:21:42 -0800
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Thread-topic: [Xen-devel] [PATCH] x86-64: use 1Gb pages in 1:1 mapping if available
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Is there any measurable performance benefit to doing this?

 -- Keir

On 24/1/08 15:04, "Jan Beulich" <jbeulich@xxxxxxxxxx> wrote:

> At once adjust the 2/4Mb page handling slightly in a few places (to
> match the newly added code):
> - when re-creating a large page mapping after finding that all small
>   page mappings in the respective area are using identical flags and
>   suitable MFNs, the virtual address was already incremented pas the
>   area to be dealt with, which needs to be accounted for in the
>   invocation of flush_area() in that path
> - don't or-in/and-out _PAGE_PSE on non-present pages
> - when comparing flags, try minimse the number of l1f_to_lNf()/
>   lNf_to_l1f() instances used
> - instead of skipping a single page when encountering a big page
>   mapping equalling to what a small page mapping would establish, skip
>   to the next larger page boundary
> 
> This patch won't apply cleanly without the previously sent patch
> adjusting show_page_walk().
> 
> Signed-off-by: Jan Beulich <jbeulich@xxxxxxxxxx>
> 
> Index: 2008-01-18/xen/arch/x86/mm.c
> ===================================================================
> --- 2008-01-18.orig/xen/arch/x86/mm.c 2008-01-23 15:39:18.000000000 +0100
> +++ 2008-01-18/xen/arch/x86/mm.c 2008-01-23 16:22:01.000000000 +0100
> @@ -113,6 +113,8 @@
>  #include <xsm/xsm.h>
>  #include <xen/trace.h>
>  
> +extern int early_boot;
> +
>  #define MEM_LOG(_f, _a...) gdprintk(XENLOG_WARNING , _f "\n" , ## _a)
>  
>  /*
> @@ -3659,7 +3661,13 @@ int ptwr_do_page_fault(struct vcpu *v, u
>  
>  void free_xen_pagetable(void *v)
>  {
> -    extern int early_boot;
> +#ifdef __x86_64__
> +    unsigned long ma = virt_to_maddr(v);
> +    unsigned long l2_ident_ma = virt_to_maddr(l2_identmap);
> +
> +    if ( ma >= l2_ident_ma && ma < l2_ident_ma + sizeof(l2_identmap) )
> +        return;
> +#endif
>  
>      BUG_ON(early_boot);
>      
> @@ -3670,8 +3678,8 @@ void free_xen_pagetable(void *v)
>  }
>  
>  /* Convert to from superpage-mapping flags for map_pages_to_xen(). */
> -#define l1f_to_l2f(f) ((f) | _PAGE_PSE)
> -#define l2f_to_l1f(f) ((f) & ~_PAGE_PSE)
> +#define l1f_to_lNf(f) ((f) & _PAGE_PRESENT ? (f) | _PAGE_PSE : (f))
> +#define lNf_to_l1f(f) ((f) & _PAGE_PRESENT ? (f) & ~_PAGE_PSE : (f))
>  
>  /*
>   * map_pages_to_xen() can be called with interrupts disabled:
> @@ -3697,6 +3705,126 @@ int map_pages_to_xen(
>  
>      while ( nr_mfns != 0 )
>      {
> +#ifdef __x86_64__
> +        l3_pgentry_t *pl3e = virt_to_xen_l3e(virt);
> +        l3_pgentry_t ol3e = *pl3e;
> +
> +        if ( cpu_has_page1gb &&
> +             !(((virt >> PAGE_SHIFT) | mfn) &
> +               ((1UL << (L3_PAGETABLE_SHIFT - PAGE_SHIFT)) - 1)) &&
> +             nr_mfns >= (1UL << (L3_PAGETABLE_SHIFT - PAGE_SHIFT)) &&
> +             !(flags & (_PAGE_PAT | MAP_SMALL_PAGES)) )
> +        {
> +            /* 1Gb-page mapping. */
> +            l3e_write_atomic(pl3e, l3e_from_pfn(mfn, l1f_to_lNf(flags)));
> +
> +            if ( (l3e_get_flags(ol3e) & _PAGE_PRESENT) )
> +            {
> +                unsigned int flush_flags =
> +                    FLUSH_TLB | FLUSH_ORDER(2 * PAGETABLE_ORDER);
> +
> +                if ( l3e_get_flags(ol3e) & _PAGE_PSE )
> +                {
> +                    if ( l3e_get_flags(ol3e) & _PAGE_GLOBAL )
> +                        flush_flags |= FLUSH_TLB_GLOBAL;
> +                    if ( (l1f_to_lNf(l3e_get_flags(ol3e)) ^ flags) &
> +                         PAGE_CACHE_ATTRS )
> +                        flush_flags |= FLUSH_CACHE;
> +                    flush_area(virt, flush_flags);
> +                }
> +                else
> +                {
> +                    pl2e = l3e_to_l2e(ol3e);
> +                    for ( i = 0; i < L2_PAGETABLE_ENTRIES; i++ )
> +                    {
> +                        ol2e = pl2e[i];
> +                        if ( !(l2e_get_flags(ol2e) & _PAGE_PRESENT) )
> +                            continue;
> +                        if ( l2e_get_flags(ol2e) & _PAGE_PSE )
> +                        {
> +                            if ( l2e_get_flags(ol2e) & _PAGE_GLOBAL )
> +                                flush_flags |= FLUSH_TLB_GLOBAL;
> +                            if ( (lNf_to_l1f(l2e_get_flags(ol2e)) ^ flags) &
> +                                 PAGE_CACHE_ATTRS )
> +                                flush_flags |= FLUSH_CACHE;
> +                        }
> +                        else
> +                        {
> +                            unsigned int j;
> +
> +                            pl1e = l2e_to_l1e(ol2e);
> +                            for ( j = 0; j < L1_PAGETABLE_ENTRIES; j++ )
> +                            {
> +                                ol1e = pl1e[j];
> +                                if ( l1e_get_flags(ol1e) & _PAGE_GLOBAL )
> +                                    flush_flags |= FLUSH_TLB_GLOBAL;
> +                                if ( (l1e_get_flags(ol1e) ^ flags) &
> +                                     PAGE_CACHE_ATTRS )
> +                                    flush_flags |= FLUSH_CACHE;
> +                            }
> +                        }
> +                    }
> +                    flush_area(virt, flush_flags);
> +                    for ( i = 0; i < L2_PAGETABLE_ENTRIES; i++ )
> +                    {
> +                        ol2e = pl2e[i];
> +                        if ( (l2e_get_flags(ol2e) & _PAGE_PRESENT) &&
> +                             !(l2e_get_flags(ol2e) & _PAGE_PSE) )
> +                            free_xen_pagetable(l2e_to_l1e(ol2e));
> +                    }
> +                    free_xen_pagetable(pl2e);
> +                }
> +            }
> +
> +            virt    += 1UL << L3_PAGETABLE_SHIFT;
> +            mfn     += 1UL << (L3_PAGETABLE_SHIFT - PAGE_SHIFT);
> +            nr_mfns -= 1UL << (L3_PAGETABLE_SHIFT - PAGE_SHIFT);
> +            continue;
> +        }
> +
> +        if ( (l3e_get_flags(ol3e) & _PAGE_PRESENT) &&
> +             (l3e_get_flags(ol3e) & _PAGE_PSE) )
> +        {
> +            unsigned int flush_flags =
> +                FLUSH_TLB | FLUSH_ORDER(2 * PAGETABLE_ORDER);
> +
> +            /* Skip this PTE if there is no change. */
> +            if ( ((l3e_get_pfn(ol3e) & ~(L2_PAGETABLE_ENTRIES *
> +                                         L1_PAGETABLE_ENTRIES - 1)) +
> +                  (l2_table_offset(virt) << PAGETABLE_ORDER) +
> +                  l1_table_offset(virt) == mfn) &&
> +                 ((lNf_to_l1f(l3e_get_flags(ol3e)) ^ flags) &
> +                  ~(_PAGE_ACCESSED|_PAGE_DIRTY)) == 0 )
> +            {
> +                i = (1 << (L3_PAGETABLE_SHIFT - PAGE_SHIFT)) -
> +                    (mfn & ((1 << (L3_PAGETABLE_SHIFT - PAGE_SHIFT)) - 1));
> +                if ( i > nr_mfns )
> +                    i = nr_mfns;
> +                virt    += i << PAGE_SHIFT;
> +                mfn     += i;
> +                nr_mfns -= i;
> +                continue;
> +            }
> +
> +            pl2e = alloc_xen_pagetable();
> +            if ( pl2e == NULL )
> +                return -ENOMEM;
> +
> +            for ( i = 0; i < L2_PAGETABLE_ENTRIES; i++ )
> +                l2e_write(pl2e + i,
> +                          l2e_from_pfn(l3e_get_pfn(ol3e) +
> +                                       (i << PAGETABLE_ORDER),
> +                                       l3e_get_flags(ol3e)));
> +
> +            if ( l3e_get_flags(ol3e) & _PAGE_GLOBAL )
> +                flush_flags |= FLUSH_TLB_GLOBAL;
> +
> +            l3e_write_atomic(pl3e, l3e_from_pfn(virt_to_mfn(pl2e),
> +                                                __PAGE_HYPERVISOR));
> +            flush_area(virt, flush_flags);
> +        }
> +#endif
> +
>          pl2e = virt_to_xen_l2e(virt);
>  
>          if ( ((((virt>>PAGE_SHIFT) | mfn) & ((1<<PAGETABLE_ORDER)-1)) == 0)
> &&
> @@ -3705,7 +3833,7 @@ int map_pages_to_xen(
>          {
>              /* Super-page mapping. */
>              ol2e = *pl2e;
> -            l2e_write_atomic(pl2e, l2e_from_pfn(mfn, l1f_to_l2f(flags)));
> +            l2e_write_atomic(pl2e, l2e_from_pfn(mfn, l1f_to_lNf(flags)));
>  
>              if ( (l2e_get_flags(ol2e) & _PAGE_PRESENT) )
>              {
> @@ -3716,8 +3844,8 @@ int map_pages_to_xen(
>                  {
>                      if ( l2e_get_flags(ol2e) & _PAGE_GLOBAL )
>                          flush_flags |= FLUSH_TLB_GLOBAL;
> -                    if ( (l2e_get_flags(ol2e) ^ l1f_to_l2f(flags)) &
> -                         l1f_to_l2f(PAGE_CACHE_ATTRS) )
> +                    if ( (lNf_to_l1f(l2e_get_flags(ol2e)) ^ flags) &
> +                         PAGE_CACHE_ATTRS )
>                          flush_flags |= FLUSH_CACHE;
>                      flush_area(virt, flush_flags);
>                  }
> @@ -3761,13 +3889,17 @@ int map_pages_to_xen(
>                  /* Skip this PTE if there is no change. */
>                  if ( (((l2e_get_pfn(*pl2e) & ~(L1_PAGETABLE_ENTRIES - 1)) +
>                         l1_table_offset(virt)) == mfn) &&
> -                     (((l2f_to_l1f(l2e_get_flags(*pl2e)) ^ flags) &
> +                     (((lNf_to_l1f(l2e_get_flags(*pl2e)) ^ flags) &
>                         ~(_PAGE_ACCESSED|_PAGE_DIRTY)) == 0) )
>                  {
> -                    virt    += 1UL << L1_PAGETABLE_SHIFT;
> -                    mfn     += 1UL;
> -                    nr_mfns -= 1UL;
> -                    continue;
> +                    i = (1 << (L2_PAGETABLE_SHIFT - PAGE_SHIFT)) -
> +                        (mfn & ((1 << (L2_PAGETABLE_SHIFT - PAGE_SHIFT)) -
> 1));
> +                    if ( i > nr_mfns )
> +                        i = nr_mfns;
> +                    virt    += i << L1_PAGETABLE_SHIFT;
> +                    mfn     += i;
> +                    nr_mfns -= i;
> +                    goto check_l3;
>                  }
>  
>                  pl1e = alloc_xen_pagetable();
> @@ -3777,7 +3909,7 @@ int map_pages_to_xen(
>                  for ( i = 0; i < L1_PAGETABLE_ENTRIES; i++ )
>                      l1e_write(&pl1e[i],
>                                l1e_from_pfn(l2e_get_pfn(*pl2e) + i,
> -                
> l2f_to_l1f(l2e_get_flags(*pl2e))));
> +                
> lNf_to_l1f(l2e_get_flags(*pl2e))));
>  
>                  if ( l2e_get_flags(*pl2e) & _PAGE_GLOBAL )
>                      flush_flags |= FLUSH_TLB_GLOBAL;
> @@ -3820,13 +3952,43 @@ int map_pages_to_xen(
>                  {
>                      ol2e = *pl2e;
>                      l2e_write_atomic(pl2e, l2e_from_pfn(base_mfn,
> -                                                        l1f_to_l2f(flags)));
> -                    flush_area(virt, (FLUSH_TLB_GLOBAL |
> -                                      FLUSH_ORDER(PAGETABLE_ORDER)));
> +                                                        l1f_to_lNf(flags)));
> +                    flush_area(virt - PAGE_SIZE,
> +                               FLUSH_TLB_GLOBAL |
> FLUSH_ORDER(PAGETABLE_ORDER));
>                      free_xen_pagetable(l2e_to_l1e(ol2e));
>                  }
>              }
>          }
> +
> + check_l3: ;
> +#ifdef __x86_64__
> +        if ( cpu_has_page1gb &&
> +             !early_boot &&
> +             flags == PAGE_HYPERVISOR &&
> +             (nr_mfns == 0 ||
> +              !(((virt >> PAGE_SHIFT) | mfn) &
> +                ((1UL << (L3_PAGETABLE_SHIFT - PAGE_SHIFT)) - 1))) )
> +        {
> +            unsigned long base_mfn;
> +
> +            ol3e = *pl3e;
> +            pl2e = l3e_to_l2e(ol3e);
> +            base_mfn = l2e_get_pfn(*pl2e) & ~(L2_PAGETABLE_ENTRIES *
> +                                              L1_PAGETABLE_ENTRIES - 1);
> +            for ( i = 0; i < L2_PAGETABLE_ENTRIES; i++, pl2e++ )
> +                if ( l2e_get_pfn(*pl2e) != base_mfn + (i << PAGETABLE_ORDER)
> ||
> +                     l2e_get_flags(*pl2e) != l1f_to_lNf(flags) )
> +                    break;
> +            if ( i == L2_PAGETABLE_ENTRIES )
> +            {
> +                l3e_write_atomic(pl3e, l3e_from_pfn(base_mfn,
> +                                                    l1f_to_lNf(flags)));
> +                flush_area(virt - PAGE_SIZE,
> +                           FLUSH_TLB_GLOBAL |
> FLUSH_ORDER(2*PAGETABLE_ORDER));
> +                free_xen_pagetable(l3e_to_l2e(ol3e));
> +            }
> +        }
> +#endif
>      }
>  
>      return 0;
> @@ -3844,6 +4006,40 @@ void destroy_xen_mappings(unsigned long
>  
>      while ( v < e )
>      {
> +#ifdef __x86_64__
> +        l3_pgentry_t *pl3e = virt_to_xen_l3e(v);
> +
> +        if ( !(l3e_get_flags(*pl3e) & _PAGE_PRESENT) )
> +        {
> +            v += 1UL << L3_PAGETABLE_SHIFT;
> +            v &= ~((1UL << L3_PAGETABLE_SHIFT) - 1);
> +            continue;
> +        }
> +
> +        if ( l3e_get_flags(*pl3e) & _PAGE_PSE )
> +        {
> +            if ( l2_table_offset(v) == 0 &&
> +                 l1_table_offset(v) == 0 &&
> +                 ((e - v) >= (1UL << L3_PAGETABLE_SHIFT)) )
> +            {
> +                /* PAGE1GB: whole superpage is destroyed. */
> +                l3e_write_atomic(pl3e, l3e_empty());
> +                v += 1UL << L3_PAGETABLE_SHIFT;
> +                continue;
> +            }
> +
> +            /* PAGE1GB: shatter the superpage and fall through. */
> +            pl2e = alloc_xen_pagetable();
> +            for ( i = 0; i < L2_PAGETABLE_ENTRIES; i++ )
> +                l2e_write(pl2e + i,
> +                          l2e_from_pfn(l3e_get_pfn(*pl3e) +
> +                                       (i << PAGETABLE_ORDER),
> +                                       l3e_get_flags(*pl3e)));
> +            l3e_write_atomic(pl3e, l3e_from_pfn(virt_to_mfn(pl2e),
> +                                                __PAGE_HYPERVISOR));
> +        }
> +#endif
> +
>          pl2e = virt_to_xen_l2e(v);
>  
>          if ( !(l2e_get_flags(*pl2e) & _PAGE_PRESENT) )
> @@ -3896,6 +4092,23 @@ void destroy_xen_mappings(unsigned long
>                  free_xen_pagetable(pl1e);
>              }
>          }
> +
> +#ifdef __x86_64__
> +        /* If we are done with the L3E, check if it is now empty. */
> +        if ( (v != e) && (l2_table_offset(v) + l1_table_offset(v) != 0) )
> +            continue;
> +        pl2e = l3e_to_l2e(*pl3e);
> +        for ( i = 0; i < L2_PAGETABLE_ENTRIES; i++ )
> +            if ( l2e_get_intpte(pl2e[i]) != 0 )
> +                break;
> +        if ( i == L2_PAGETABLE_ENTRIES )
> +        {
> +            /* Empty: zap the L3E and free the L2 page. */
> +            l3e_write_atomic(pl3e, l3e_empty());
> +            flush_all(FLUSH_TLB_GLOBAL); /* flush before free */
> +            free_xen_pagetable(pl2e);
> +        }
> +#endif
>      }
>  
>      flush_all(FLUSH_TLB_GLOBAL);
> Index: 2008-01-18/xen/arch/x86/setup.c
> ===================================================================
> --- 2008-01-18.orig/xen/arch/x86/setup.c 2008-01-23 15:39:18.000000000 +0100
> +++ 2008-01-18/xen/arch/x86/setup.c 2008-01-23 16:51:48.000000000 +0100
> @@ -672,8 +672,9 @@ void __init __start_xen(unsigned long mb
>                  pl3e = l4e_to_l3e(*pl4e);
>                  for ( j = 0; j < L3_PAGETABLE_ENTRIES; j++, pl3e++ )
>                  {
> -                    /* Not present or already relocated? */
> +                    /* Not present, 1Gb mapping, or already relocated? */
>                      if ( !(l3e_get_flags(*pl3e) & _PAGE_PRESENT) ||
> +                         (l3e_get_flags(*pl3e) & _PAGE_PSE) ||
>                           (l3e_get_pfn(*pl3e) > 0x1000) )
>                          continue;
>                      *pl3e = l3e_from_intpte(l3e_get_intpte(*pl3e) +
> Index: 2008-01-18/xen/arch/x86/x86_64/mm.c
> ===================================================================
> --- 2008-01-18.orig/xen/arch/x86/x86_64/mm.c 2008-01-23 15:39:18.000000000
> +0100
> +++ 2008-01-18/xen/arch/x86/x86_64/mm.c 2008-01-23 11:56:42.000000000 +0100
> @@ -70,30 +70,36 @@ void *alloc_xen_pagetable(void)
>      return mfn_to_virt(mfn);
>  }
>  
> -l2_pgentry_t *virt_to_xen_l2e(unsigned long v)
> +l3_pgentry_t *virt_to_xen_l3e(unsigned long v)
>  {
>      l4_pgentry_t *pl4e;
> -    l3_pgentry_t *pl3e;
> -    l2_pgentry_t *pl2e;
>  
>      pl4e = &idle_pg_table[l4_table_offset(v)];
>      if ( !(l4e_get_flags(*pl4e) & _PAGE_PRESENT) )
>      {
> -        pl3e = alloc_xen_pagetable();
> +        l3_pgentry_t *pl3e = alloc_xen_pagetable();
> +
>          clear_page(pl3e);
>          l4e_write(pl4e, l4e_from_paddr(__pa(pl3e), __PAGE_HYPERVISOR));
>      }
>      
> -    pl3e = l4e_to_l3e(*pl4e) + l3_table_offset(v);
> +    return l4e_to_l3e(*pl4e) + l3_table_offset(v);
> +}
> +
> +l2_pgentry_t *virt_to_xen_l2e(unsigned long v)
> +{
> +    l3_pgentry_t *pl3e;
> +
> +    pl3e = virt_to_xen_l3e(v);
>      if ( !(l3e_get_flags(*pl3e) & _PAGE_PRESENT) )
>      {
> -        pl2e = alloc_xen_pagetable();
> +        l2_pgentry_t *pl2e = alloc_xen_pagetable();
> +
>          clear_page(pl2e);
>          l3e_write(pl3e, l3e_from_paddr(__pa(pl2e), __PAGE_HYPERVISOR));
>      }
>      
> -    pl2e = l3e_to_l2e(*pl3e) + l2_table_offset(v);
> -    return pl2e;
> +    return l3e_to_l2e(*pl3e) + l2_table_offset(v);
>  }
>  
>  void __init paging_init(void)
> Index: 2008-01-18/xen/arch/x86/x86_64/traps.c
> ===================================================================
> --- 2008-01-18.orig/xen/arch/x86/x86_64/traps.c 2008-01-23 15:39:18.000000000
> +0100
> +++ 2008-01-18/xen/arch/x86/x86_64/traps.c 2008-01-23 11:58:58.000000000 +0100
> @@ -148,9 +148,11 @@ void show_page_walk(unsigned long addr)
>      mfn = l3e_get_pfn(l3e);
>      pfn = mfn_valid(mfn) && mpt_valid ?
>            get_gpfn_from_mfn(mfn) : INVALID_M2P_ENTRY;
> -    printk(" L3[0x%03lx] = %"PRIpte" %016lx\n",
> -           l3_table_offset(addr), l3e_get_intpte(l3e), pfn);
> -    if ( !(l3e_get_flags(l3e) & _PAGE_PRESENT) )
> +    printk(" L3[0x%03lx] = %"PRIpte" %016lx%s\n",
> +           l3_table_offset(addr), l3e_get_intpte(l3e), pfn,
> +           (l3e_get_flags(l3e) & _PAGE_PSE) ? " (PSE)" : "");
> +    if ( !(l3e_get_flags(l3e) & _PAGE_PRESENT) ||
> +         (l3e_get_flags(l3e) & _PAGE_PSE) )
>          return;
>  
>      l2t = mfn_to_virt(mfn);
> Index: 2008-01-18/xen/include/asm-x86/page.h
> ===================================================================
> --- 2008-01-18.orig/xen/include/asm-x86/page.h 2008-01-23 15:39:18.000000000
> +0100
> +++ 2008-01-18/xen/include/asm-x86/page.h 2008-01-22 15:35:32.000000000 +0100
> @@ -350,6 +350,9 @@ static inline int get_order_from_pages(u
>  void *alloc_xen_pagetable(void);
>  void free_xen_pagetable(void *v);
>  l2_pgentry_t *virt_to_xen_l2e(unsigned long v);
> +#ifdef __x86_64__
> +l3_pgentry_t *virt_to_xen_l3e(unsigned long v);
> +#endif
>  
>  /* Map machine page range in Xen virtual address space. */
>  #define MAP_SMALL_PAGES _PAGE_AVAIL0 /* don't use superpages for the mapping
> */
> Index: 2008-01-18/xen/include/asm-x86/x86_64/page.h
> ===================================================================
> --- 2008-01-18.orig/xen/include/asm-x86/x86_64/page.h 2008-01-23
> 15:39:18.000000000 +0100
> +++ 2008-01-18/xen/include/asm-x86/x86_64/page.h 2008-01-23 11:14:54.000000000
> +0100
> @@ -59,6 +59,8 @@ typedef struct { intpte_t l3; } l3_pgent
>  typedef struct { intpte_t l4; } l4_pgentry_t;
>  typedef l4_pgentry_t root_pgentry_t;
>  
> +extern l2_pgentry_t l2_identmap[4*L2_PAGETABLE_ENTRIES];
> +
>  #endif /* !__ASSEMBLY__ */
>  
>  #define pte_read_atomic(ptep)       (*(ptep))
> 
> 
> 
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> http://lists.xensource.com/xen-devel



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