static unsigned long __init compute_dom0_nr_pages(
struct domain *d, struct elf_dom_parms *parms, unsigned long initrd_len)
{
unsigned long avail = avail_domheap_pages() + initial_images_nrpages();
unsigned long nr_pages = dom0_nrpages;
unsigned long min_pages = dom0_min_nrpages;
unsigned long max_pages = dom0_max_nrpages;
/* Reserve memory for further dom0 vcpu-struct allocations... */
avail -= (opt_dom0_max_vcpus - 1UL)
<< get_order_from_bytes(sizeof(struct vcpu));
/* ...and compat_l4's, if needed. */
if ( is_pv_32on64_domain(d) )
avail -= opt_dom0_max_vcpus - 1;
/* Reserve memory for iommu_dom0_init() (rough estimate). */
if ( iommu_enabled )
{
unsigned int s;
for ( s = 9; s < BITS_PER_LONG; s += 9 )
avail -= max_pdx >> s;
}
/*
* If domain 0 allocation isn't specified, reserve 1/16th of available
* memory for things like DMA buffers. This reservation is clamped to
* a maximum of 128MB.
*/
if ( nr_pages == 0 )
nr_pages = -min(avail / 16, 128UL << (20 - PAGE_SHIFT));
/* Negative memory specification means "all memory - specified amount". */
if ( (long)nr_pages < 0 ) nr_pages += avail;
if ( (long)min_pages < 0 ) min_pages += avail;
if ( (long)max_pages < 0 ) max_pages += avail;
/* Clamp dom0 memory according to min/max limits and available memory. */
nr_pages = max(nr_pages, min_pages);
nr_pages = min(nr_pages, max_pages);
nr_pages = min(nr_pages, avail);
#ifdef __x86_64__
if ( (parms->p2m_base == UNSET_ADDR) && (dom0_nrpages <= 0) &&
((dom0_min_nrpages <= 0) || (nr_pages > min_pages)) )
{
/*
* Legacy Linux kernels (i.e. such without a XEN_ELFNOTE_INIT_P2M
* note) require that there is enough virtual space beyond the initial
* allocation to set up their initial page tables. This space is
* roughly the same size as the p2m table, so make sure the initial
* allocation doesn't consume more than about half the space that's
* available between params.virt_base and the address space end.
*/
unsigned long vstart, vend, end;
size_t sizeof_long = is_pv_32bit_domain(d) ? sizeof(int) : sizeof(long);
vstart = parms->virt_base;
vend = round_pgup(parms->virt_kend);
if ( !parms->elf_notes[XEN_ELFNOTE_MOD_START_PFN].data.num )
vend += round_pgup(initrd_len);
end = vend + nr_pages * sizeof_long;
if ( end > vstart )
end += end - vstart;
if ( end <= vstart ||
(sizeof_long < sizeof(end) && end > (1UL << (8 * sizeof_long))) )
{
end = sizeof_long >= sizeof(end) ? 0 : 1UL << (8 * sizeof_long);
nr_pages = (end - vend) / (2 * sizeof_long);
if ( dom0_min_nrpages > 0 && nr_pages < min_pages )
nr_pages = min_pages;
printk("Dom0 memory clipped to %lu pages\n", nr_pages);
}
}
#endif
d->max_pages = min_t(unsigned long, max_pages, UINT_MAX);
return nr_pages;
}
domain_set_alloc_bitsize(d);
/*
* Why do we need this? The number of page-table frames depends on the
* size of the bootstrap address space. But the size of the address space
* depends on the number of page-table frames (since each one is mapped
* read-only). We have a pair of simultaneous equations in two unknowns,
* which we solve by exhaustive search.
*/
v_start = parms.virt_base;
vkern_start = parms.virt_kstart;
vkern_end = parms.virt_kend;
vinitrd_start = round_pgup(vkern_end);
vinitrd_end = vinitrd_start + initrd_len;
vphysmap_start = round_pgup(vinitrd_end);
vphysmap_end = vphysmap_start + (nr_pages * (!is_pv_32on64_domain(d) ?
sizeof(unsigned long) :
sizeof(unsigned int)));
vstartinfo_start = round_pgup(vphysmap_end);
vstartinfo_end = (vstartinfo_start +
sizeof(struct start_info) +
sizeof(struct dom0_vga_console_info));
vpt_start = round_pgup(vstartinfo_end);
for ( nr_pt_pages = 2; ; nr_pt_pages++ )
{
vpt_end = vpt_start + (nr_pt_pages * PAGE_SIZE);
vstack_start = vpt_end;
vstack_end = vstack_start + PAGE_SIZE;
v_end = (vstack_end + (1UL<<22)-1) & ~((1UL<<22)-1);
if ( (v_end - vstack_end) < (512UL << 10) )
v_end += 1UL << 22; /* Add extra 4MB to get >= 512kB padding. */
static int alloc_xenoprof_struct(
struct domain *d, int max_samples, int is_passive)
{
struct vcpu *v;
int nvcpu, npages, bufsize, max_bufsize;
unsigned max_max_samples;
int i;
d->xenoprof = xmalloc(struct xenoprof);
if ( d->xenoprof == NULL )
{
printk("alloc_xenoprof_struct(): memory allocation failed\n");
return -ENOMEM;
}
memset(d->xenoprof, 0, sizeof(*d->xenoprof));
d->xenoprof->vcpu = xmalloc_array(struct xenoprof_vcpu, d->max_vcpus);
if ( d->xenoprof->vcpu == NULL )
{
xfree(d->xenoprof);
d->xenoprof = NULL;
printk("alloc_xenoprof_struct(): vcpu array allocation failed\n");
return -ENOMEM;
}
memset(d->xenoprof->vcpu, 0, d->max_vcpus * sizeof(*d->xenoprof->vcpu));
nvcpu = 0;
for_each_vcpu ( d, v )
nvcpu++;
bufsize = sizeof(struct xenoprof_buf);
i = sizeof(struct event_log);
#ifdef CONFIG_COMPAT
d->xenoprof->is_compat = is_pv_32on64_domain(is_passive ? dom0 : d);
if ( XENOPROF_COMPAT(d->xenoprof) )
{
bufsize = sizeof(struct compat_oprof_buf);
i = sizeof(struct compat_event_log);
}
#endif
/* reduce max_samples if necessary to limit pages allocated */
max_bufsize = (MAX_OPROF_SHARED_PAGES * PAGE_SIZE) / nvcpu;
max_max_samples = ( (max_bufsize - bufsize) / i ) + 1;
if ( (unsigned)max_samples > max_max_samples )
max_samples = max_max_samples;
bufsize += (max_samples - 1) * i;
npages = (nvcpu * bufsize - 1) / PAGE_SIZE + 1;
d->xenoprof->rawbuf = alloc_xenheap_pages(get_order_from_pages(npages), 0);
if ( d->xenoprof->rawbuf == NULL )
{
xfree(d->xenoprof);
d->xenoprof = NULL;
return -ENOMEM;
}
d->xenoprof->npages = npages;
d->xenoprof->nbuf = nvcpu;
d->xenoprof->bufsize = bufsize;
d->xenoprof->domain_ready = 0;
d->xenoprof->domain_type = XENOPROF_DOMAIN_IGNORED;
/* Update buffer pointers for active vcpus */
i = 0;
for_each_vcpu ( d, v )
{
xenoprof_buf_t *buf = (xenoprof_buf_t *)
&d->xenoprof->rawbuf[i * bufsize];
d->xenoprof->vcpu[v->vcpu_id].event_size = max_samples;
d->xenoprof->vcpu[v->vcpu_id].buffer = buf;
xenoprof_buf(d, buf, event_size) = max_samples;
xenoprof_buf(d, buf, vcpu_id) = v->vcpu_id;
i++;
/* in the unlikely case that the number of active vcpus changes */
if ( i >= nvcpu )
break;
}
