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#include <xen/config.h>
#include <xen/sched.h>
#include <xen/lib.h>
#include <xen/errno.h>
#include <xen/domain_page.h>
void p2m_load_VTTBR(struct domain *d)
{
struct p2m_domain *p2m = &d->arch.p2m;
paddr_t maddr = page_to_maddr(p2m->first_level);
uint64_t vttbr = maddr;
vttbr |= ((uint64_t)p2m->vmid&0xff)<<48;
printk("VTTBR dom%d = %"PRIx64"\n", d->domain_id, vttbr);
WRITE_CP64(vttbr, VTTBR);
isb(); /* Ensure update is visible */
}
static int p2m_create_entry(struct domain *d,
lpae_t *entry)
{
struct p2m_domain *p2m = &d->arch.p2m;
struct page_info *page;
void *p;
lpae_t pte;
BUG_ON(entry->p2m.valid);
page = alloc_domheap_page(d, 0);
if ( page == NULL )
return -ENOMEM;
page_list_add(page, &p2m->pages);
p = __map_domain_page(page);
clear_page(p);
unmap_domain_page(p);
pte = mfn_to_p2m_entry(page_to_mfn(page));
write_pte(entry, pte);
return 0;
}
static int create_p2m_entries(struct domain *d,
int alloc,
paddr_t start_gpaddr,
paddr_t end_gpaddr,
paddr_t maddr)
{
int rc;
struct p2m_domain *p2m = &d->arch.p2m;
lpae_t *first = NULL, *second = NULL, *third = NULL;
paddr_t addr;
unsigned long cur_first_offset = ~0, cur_second_offset = ~0;
/* XXX Don't actually handle 40 bit guest physical addresses */
BUG_ON(start_gpaddr & 0x8000000000ULL);
BUG_ON(end_gpaddr & 0x8000000000ULL);
first = __map_domain_page(p2m->first_level);
for(addr = start_gpaddr; addr < end_gpaddr; addr += PAGE_SIZE)
{
if ( !first[first_table_offset(addr)].p2m.valid )
{
rc = p2m_create_entry(d, &first[first_table_offset(addr)]);
if ( rc < 0 ) {
printk("p2m_populate_ram: L1 failed\n");
goto out;
}
}
BUG_ON(!first[first_table_offset(addr)].p2m.valid);
if ( cur_first_offset != first_table_offset(addr) )
{
if (second) unmap_domain_page(second);
second = map_domain_page(first[first_table_offset(addr)].p2m.base);
cur_first_offset = first_table_offset(addr);
}
/* else: second already valid */
if ( !second[second_table_offset(addr)].p2m.valid )
{
rc = p2m_create_entry(d, &second[second_table_offset(addr)]);
if ( rc < 0 ) {
printk("p2m_populate_ram: L2 failed\n");
goto out;
}
}
BUG_ON(!second[second_table_offset(addr)].p2m.valid);
if ( cur_second_offset != second_table_offset(addr) )
{
/* map third level */
if (third) unmap_domain_page(third);
third = map_domain_page(second[second_table_offset(addr)].p2m.base);
cur_second_offset = second_table_offset(addr);
}
/* else: third already valid */
BUG_ON(third[third_table_offset(addr)].p2m.valid);
/* Allocate a new RAM page and attach */
if (alloc)
{
struct page_info *page;
lpae_t pte;
rc = -ENOMEM;
page = alloc_domheap_page(d, 0);
if ( page == NULL ) {
printk("p2m_populate_ram: failed to allocate page\n");
goto out;
}
pte = mfn_to_p2m_entry(page_to_mfn(page));
write_pte(&third[third_table_offset(addr)], pte);
} else {
lpae_t pte = mfn_to_p2m_entry(maddr >> PAGE_SHIFT);
write_pte(&third[third_table_offset(addr)], pte);
maddr += PAGE_SIZE;
}
}
rc = 0;
out:
spin_lock(&p2m->lock);
if (third) unmap_domain_page(third);
if (second) unmap_domain_page(second);
if (first) unmap_domain_page(first);
spin_unlock(&p2m->lock);
return rc;
}
int p2m_populate_ram(struct domain *d,
paddr_t start,
paddr_t end)
{
return create_p2m_entries(d, 1, start, end, 0);
}
int map_mmio_regions(struct domain *d,
paddr_t start_gaddr,
paddr_t end_gaddr,
paddr_t maddr)
{
return create_p2m_entries(d, 0, start_gaddr, end_gaddr, maddr);
}
int p2m_alloc_table(struct domain *d)
{
struct p2m_domain *p2m = &d->arch.p2m;
struct page_info *page;
void *p;
/* First level P2M is 2 consecutive pages */
page = alloc_domheap_pages(d, 1, 0);
if ( page == NULL )
return -ENOMEM;
spin_lock(&p2m->lock);
page_list_add(page, &p2m->pages);
/* Clear both first level pages */
p = __map_domain_page(page);
clear_page(p);
unmap_domain_page(p);
p = __map_domain_page(page + 1);
clear_page(p);
unmap_domain_page(p);
p2m->first_level = page;
spin_unlock(&p2m->lock);
return 0;
}
int p2m_init(struct domain *d)
{
struct p2m_domain *p2m = &d->arch.p2m;
spin_lock_init(&p2m->lock);
INIT_PAGE_LIST_HEAD(&p2m->pages);
/* XXX allocate properly */
/* Zero is reserved */
p2m->vmid = d->domain_id + 1;
p2m->first_level = NULL;
return 0;
}
/*
* Local variables:
* mode: C
* c-set-style: "BSD"
* c-basic-offset: 4
* indent-tabs-mode: nil
* End:
*/
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