Re: [Xen-devel] 32bit-pv-VM 128G memory limited

[Keir Fraser <keir.fraser@xxxxxxxxxxxxx>]

This should all already happen by default.

 -- Keir

On 02/11/2009 07:49, "James Song" <jsong@xxxxxxxxxx> wrote:

> Hi, 
>  
>  
>     Since 32-bit pv-domUs require memory below the 128G boundary (IIRC) but
> tools don't enforce this.  So we need a "memory pool" for 32bit pv-domUs.
> When starting a 32-bit domU, allocate memory from this pool.  If starting a
> 64-bit domUs or 32bit hvm dom (which don't suffer the 128G boundary
> limitation), allocate memory from above the boundary first, only allocating
> from the lower pool when needed.
>  
> Thanks,
> James (Song Wei)
>  
> Signed-off-by: James Song Wei <jsong@xxxxxxxxxx>
> diff -r 059c01d69a08 tools/libxc/xc_dom_x86.c
> --- a/tools/libxc/xc_dom_x86.c Thu Oct 29 14:48:28 2009 +0000
> +++ b/tools/libxc/xc_dom_x86.c Mon Nov 02 15:37:42 2009 +0800
> @@ -639,7 +639,7 @@
>      xc_dom_register_arch_hooks(&xc_dom_64);
>  }
>  
> -static int x86_compat(int xc, domid_t domid, char *guest_type)
> +static int x86_compat(int xc, domid_t domid, char *guest_type, int
> *guest_size)
>  {
>      static const struct {
>          char           *guest;
> @@ -660,6 +660,7 @@
>      if ( domctl.u.address_size.size == 0 )
>          /* nothing to do */
>          return 0;
> +    *guest_size = domctl.u.address_size.size;
>  
>      xc_dom_printf("%s: guest %s, address size %" PRId32 "\n", __FUNCTION__,
>                    guest_type, domctl.u.address_size.size);
> @@ -696,10 +697,11 @@
>  
>  int arch_setup_meminit(struct xc_dom_image *dom)
>  {
> -    int rc;
> +    int rc, host_64bit=0, mem_128_limit=0, guest_size=0;
>      xen_pfn_t pfn, allocsz, i, j, mfn;
> +    xc_physinfo_t put_info;
>  
> -    rc = x86_compat(dom->guest_xc, dom->guest_domid, dom->guest_type);
> +    rc = x86_compat(dom->guest_xc, dom->guest_domid, dom->guest_type,
> &guest_size);
>      if ( rc )
>          return rc;
>      if ( xc_dom_feature_translated(dom) )
> @@ -740,6 +742,12 @@
>          for ( pfn = 0; pfn < dom->total_pages; pfn++ )
>              dom->p2m_host[pfn] = pfn;
>          
> +        xc_physinfo(dom->guest_xc, &put_info);
> +        if((put_info.total_pages * (XC_PAGE_SIZE / 1024))/(1024*1024) > 128)
> +            mem_128_limit = 1;
> +
> +        if(strstr(dom->xen_caps, "x86_64") != NULL)
> +            host_64bit=1;
>          /* allocate guest memory */
>          for ( i = rc = allocsz = 0;
>                (i < dom->total_pages) && !rc;
> @@ -751,6 +759,22 @@
>              rc = xc_domain_memory_populate_physmap(
>                  dom->guest_xc, dom->guest_domid, allocsz,
>                  0, 0, &dom->p2m_host[i]);
> +            if((host_64bit == 1) && (mem_128_limit))
> +            {
> +                if( (guest_size == 32) )// 32bit guest
> +                    rc = xc_domain_memory_populate_physmap(
> +                        dom->guest_xc, dom->guest_domid, allocsz, 0,
> XENMEMF_address_bits(37), &dom->p2m_host[i]);
> +                else if( (guest_size == 64) );//64bit
> +                    rc = xc_domain_memory_populate_physmap(
> +                        dom->guest_xc, dom->guest_domid, allocsz, 0,
> XENMEMF_address_bits(37) | XENMEMF_above_bits, &dom->p2m_host[i]);
> +                if( rc != 0 )
> +                    rc = xc_domain_memory_populate_physmap(
> +                        dom->guest_xc, dom->guest_domid, allocsz, 0, 0,
> &dom->p2m_host[i]);
> +            } 
> +            else
> +                rc = xc_domain_memory_populate_physmap(
> +                        dom->guest_xc, dom->guest_domid, allocsz, 0, 0,
> &dom->p2m_host[i]);
> + 
>          }
>      }
>  
> diff -r 059c01d69a08 xen/common/page_alloc.c
> --- a/xen/common/page_alloc.c Thu Oct 29 14:48:28 2009 +0000
> +++ b/xen/common/page_alloc.c Mon Nov 02 15:37:42 2009 +0800
> @@ -1085,9 +1085,9 @@
>      struct page_info *pg = NULL;
>      unsigned int bits = memflags >> _MEMF_bits, zone_hi = NR_ZONES - 1;
>      unsigned int node = (uint8_t)((memflags >> _MEMF_node) - 1), dma_zone;
> +    unsigned int is_limit_lo = memflags & _MEMF_above_bit;
>  
>      ASSERT(!in_irq());
> -
>      if ( (node == NUMA_NO_NODE) && (d != NULL) )
>          node = domain_to_node(d);
>  
> @@ -1099,8 +1099,9 @@
>          pg = alloc_heap_pages(dma_zone + 1, zone_hi, node, order, memflags);
>  
>      if ( (pg == NULL) &&
> -         ((pg = alloc_heap_pages(MEMZONE_XEN + 1, zone_hi,
> -                                 node, order, memflags)) == NULL) )
> +         ((pg = alloc_heap_pages(is_limit_lo ? bits : (MEMZONE_XEN + 1),
> +              is_limit_lo ? min_t(unsigned int,
> bits_to_zone(BITS_PER_LONG+PAGE_SHIFT),NR_ZONES-1) :zone_hi,
> +                  node, order,memflags)) == NULL) )
>           return NULL;
>  
>      if ( (d != NULL) && assign_pages(d, pg, order, memflags) )
> diff -r 059c01d69a08 xen/include/public/memory.h
> --- a/xen/include/public/memory.h Thu Oct 29 14:48:28 2009 +0000
> +++ b/xen/include/public/memory.h Mon Nov 02 15:37:42 2009 +0800
> @@ -52,6 +52,8 @@
>  #define XENMEMF_get_node(x) ((((x) >> 8) - 1) & 0xffu)
>  /* Flag to populate physmap with populate-on-demand entries */
>  #define XENMEMF_populate_on_demand (1<<16)
> +/* Allocate the pages above the bits */
> +#define XENMEMF_above_bits (1<<7)
>  #endif
>  
>  struct xen_memory_reservation {
> diff -r 059c01d69a08 xen/include/xen/mm.h
> --- a/xen/include/xen/mm.h Thu Oct 29 14:48:28 2009 +0000
> +++ b/xen/include/xen/mm.h Mon Nov 02 15:37:42 2009 +0800
> @@ -81,6 +81,7 @@
>  #define _MEMF_node        8
>  #define  MEMF_node(n)     ((((n)+1)&0xff)<<_MEMF_node)
>  #define _MEMF_bits        24
> +#define _MEMF_above_bit   (1<<7)
>  #define  MEMF_bits(n)     ((n)<<_MEMF_bits)
>  
>  #ifdef CONFIG_PAGEALLOC_MAX_ORDER
> 



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