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Diffstat (limited to 'arch/x86/xen/p2m.c')
-rw-r--r--arch/x86/xen/p2m.c19
1 files changed, 13 insertions, 6 deletions
diff --git a/arch/x86/xen/p2m.c b/arch/x86/xen/p2m.c
index 660b3cfef234..cab9f766bb06 100644
--- a/arch/x86/xen/p2m.c
+++ b/arch/x86/xen/p2m.c
@@ -530,7 +530,7 @@ static pte_t *alloc_p2m_pmd(unsigned long addr, pte_t *pte_pg)
* the new pages are installed with cmpxchg; if we lose the race then
* simply free the page we allocated and use the one that's there.
*/
-static bool alloc_p2m(unsigned long pfn)
+int xen_alloc_p2m_entry(unsigned long pfn)
{
unsigned topidx;
unsigned long *top_mfn_p, *mid_mfn;
@@ -540,6 +540,9 @@ static bool alloc_p2m(unsigned long pfn)
unsigned long addr = (unsigned long)(xen_p2m_addr + pfn);
unsigned long p2m_pfn;
+ if (xen_feature(XENFEAT_auto_translated_physmap))
+ return 0;
+
ptep = lookup_address(addr, &level);
BUG_ON(!ptep || level != PG_LEVEL_4K);
pte_pg = (pte_t *)((unsigned long)ptep & ~(PAGE_SIZE - 1));
@@ -548,7 +551,7 @@ static bool alloc_p2m(unsigned long pfn)
/* PMD level is missing, allocate a new one */
ptep = alloc_p2m_pmd(addr, pte_pg);
if (!ptep)
- return false;
+ return -ENOMEM;
}
if (p2m_top_mfn && pfn < MAX_P2M_PFN) {
@@ -566,7 +569,7 @@ static bool alloc_p2m(unsigned long pfn)
mid_mfn = alloc_p2m_page();
if (!mid_mfn)
- return false;
+ return -ENOMEM;
p2m_mid_mfn_init(mid_mfn, p2m_missing);
@@ -592,7 +595,7 @@ static bool alloc_p2m(unsigned long pfn)
p2m = alloc_p2m_page();
if (!p2m)
- return false;
+ return -ENOMEM;
if (p2m_pfn == PFN_DOWN(__pa(p2m_missing)))
p2m_init(p2m);
@@ -625,8 +628,9 @@ static bool alloc_p2m(unsigned long pfn)
HYPERVISOR_shared_info->arch.max_pfn = xen_p2m_last_pfn;
}
- return true;
+ return 0;
}
+EXPORT_SYMBOL(xen_alloc_p2m_entry);
unsigned long __init set_phys_range_identity(unsigned long pfn_s,
unsigned long pfn_e)
@@ -688,7 +692,10 @@ bool __set_phys_to_machine(unsigned long pfn, unsigned long mfn)
bool set_phys_to_machine(unsigned long pfn, unsigned long mfn)
{
if (unlikely(!__set_phys_to_machine(pfn, mfn))) {
- if (!alloc_p2m(pfn))
+ int ret;
+
+ ret = xen_alloc_p2m_entry(pfn);
+ if (ret < 0)
return false;
return __set_phys_to_machine(pfn, mfn);