[Xen-changelog] [xen staging] xen/arm: introduce allocate_memory

[p***@xen.org]

commit f2931b4233ec38e9f8d2b3ec6d86a9c7f9ebedc2
Author: Stefano Stabellini <***@kernel.org>
AuthorDate: Tue Nov 13 09:00:25 2018 -0800
Commit: Julien Grall <***@arm.com>
CommitDate: Wed Nov 14 19:34:47 2018 +0000

xen/arm: introduce allocate_memory

Introduce an allocate_memory function able to allocate memory for DomUs
and map it at the right guest addresses, according to the guest memory
map: GUEST_RAM0_BASE and GUEST_RAM1_BASE.

This is under #if 0 as not used for now.

Signed-off-by: Julien Grall <***@arm.com>
Signed-off-by: Stefano Stabellini <***@xilinx.com>
---
xen/arch/arm/domain_build.c | 101 ++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 101 insertions(+)

diff --git a/xen/arch/arm/domain_build.c b/xen/arch/arm/domain_build.c
index 66a258ab9c..957572bded 100644
--- a/xen/arch/arm/domain_build.c
+++ b/xen/arch/arm/domain_build.c
@@ -368,6 +368,107 @@ static void __init allocate_memory_11(struct domain *d,
}
}

+#if 0
+static bool __init allocate_bank_memory(struct domain *d,
+ struct kernel_info *kinfo,
+ gfn_t sgfn,
+ unsigned long tot_size)
+{
+ int res;
+ struct page_info *pg;
+ struct membank *bank;
+ unsigned int max_order = ~0;
+
+ bank = &kinfo->mem.bank[kinfo->mem.nr_banks];
+ bank->start = gfn_to_gaddr(sgfn);
+ bank->size = tot_size;
+
+ while ( tot_size > 0 )
+ {
+ unsigned int order = get_allocation_size(tot_size);
+
+ order = min(max_order, order);
+
+ pg = alloc_domheap_pages(d, order, 0);
+ if ( !pg )
+ {
+ /*
+ * If we can't allocate one page, then it is unlikely to
+ * succeed in the next iteration. So bail out.
+ */
+ if ( !order )
+ return false;
+
+ /*
+ * If we can't allocate memory with order, then it is
+ * unlikely to succeed in the next iteration.
+ * Record the order - 1 to avoid re-trying.
+ */
+ max_order = order - 1;
+ continue;
+ }
+
+ res = guest_physmap_add_page(d, sgfn, page_to_mfn(pg), order);
+ if ( res )
+ {
+ dprintk(XENLOG_ERR, "Failed map pages to DOMU: %d", res);
+ return false;
+ }
+
+ sgfn = gfn_add(sgfn, 1UL << order);
+ tot_size -= (1ULL << (PAGE_SHIFT + order));
+ }
+
+ kinfo->mem.nr_banks++;
+ kinfo->unassigned_mem -= bank->size;
+
+ return true;
+}
+
+static void __init allocate_memory(struct domain *d, struct kernel_info *kinfo)
+{
+ unsigned int i;
+ unsigned long bank_size;
+
+ printk(XENLOG_INFO "Allocating mappings totalling %ldMB for %pd:\n",
+ /* Don't want format this as PRIpaddr (16 digit hex) */
+ (unsigned long)(kinfo->unassigned_mem >> 20), d);
+
+ kinfo->mem.nr_banks = 0;
+ bank_size = MIN(GUEST_RAM0_SIZE, kinfo->unassigned_mem);
+ if ( !allocate_bank_memory(d, kinfo, gaddr_to_gfn(GUEST_RAM0_BASE),
+ bank_size) )
+ goto fail;
+
+ bank_size = MIN(GUEST_RAM1_SIZE, kinfo->unassigned_mem);
+ if ( !allocate_bank_memory(d, kinfo, gaddr_to_gfn(GUEST_RAM1_BASE),
+ bank_size) )
+ goto fail;
+
+ if ( kinfo->unassigned_mem )
+ goto fail;
+
+ for( i = 0; i < kinfo->mem.nr_banks; i++ )
+ {
+ printk(XENLOG_INFO "%pd BANK[%d] %#"PRIpaddr"-%#"PRIpaddr" (%ldMB)\n",
+ d,
+ i,
+ kinfo->mem.bank[i].start,
+ kinfo->mem.bank[i].start + kinfo->mem.bank[i].size,
+ /* Don't want format this as PRIpaddr (16 digit hex) */
+ (unsigned long)(kinfo->mem.bank[i].size >> 20));
+ }
+
+ return;
+
+fail:
+ panic("Failed to allocate requested domain memory."
+ /* Don't want format this as PRIpaddr (16 digit hex) */
+ " %ldKB unallocated. Fix the VMs configurations.\n",
+ (unsigned long)kinfo->unassigned_mem >> 10);
+}
+#endif
+
static int __init write_properties(struct domain *d, struct kernel_info *kinfo,
const struct dt_device_node *node)
{
--
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