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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [PATCH v6 7/7] xen/arm: introduce allocate_static_memory
This commit introduces a new function allocate_static_memory to allocate
static memory as guest RAM for Domain on Static Allocation.
It uses acquire_domstatic_pages to acquire pre-configured static memory
for this domain, and uses guest_physmap_add_pages to set up P2M table.
These pre-defined static memory banks shall be mapped to the usual guest
memory addresses (GUEST_RAM0_BASE, GUEST_RAM1_BASE) defined by
xen/include/public/arch-arm.h.
In order to deal with the trouble of count-to-order conversion when page number
is not in a power-of-two, this commit exports p2m_insert_mapping and introduce
a new function guest_physmap_add_pages to cope with adding guest RAM p2m
mapping with nr_pages.
Signed-off-by: Penny Zheng <penny.zheng@xxxxxxx>
---
xen/arch/arm/domain_build.c | 161 +++++++++++++++++++++++++++++++++++-
xen/arch/arm/p2m.c | 7 +-
xen/include/asm-arm/p2m.h | 11 +++
3 files changed, 173 insertions(+), 6 deletions(-)
diff --git a/xen/arch/arm/domain_build.c b/xen/arch/arm/domain_build.c
index 206038d1c0..b011cc4789 100644
--- a/xen/arch/arm/domain_build.c
+++ b/xen/arch/arm/domain_build.c
@@ -480,6 +480,162 @@ fail:
(unsigned long)kinfo->unassigned_mem >> 10);
}
+#ifdef CONFIG_STATIC_MEMORY
+static bool __init append_static_memory_to_bank(struct domain *d,
+ struct membank *bank,
+ mfn_t smfn,
+ paddr_t size)
+{
+ int res;
+ unsigned int nr_pages = PFN_DOWN(size);
+ /* Infer next GFN. */
+ gfn_t sgfn = gaddr_to_gfn(bank->start + bank->size);
+
+ res = guest_physmap_add_pages(d, sgfn, smfn, nr_pages);
+ if ( res )
+ {
+ dprintk(XENLOG_ERR, "Failed to map pages to DOMU: %d", res);
+ return false;
+ }
+
+ bank->size = bank->size + size;
+
+ return true;
+}
+
+/* Allocate memory from static memory as RAM for one specific domain d. */
+static void __init allocate_static_memory(struct domain *d,
+ struct kernel_info *kinfo,
+ const struct dt_device_node *node)
+{
+ const struct dt_property *prop;
+ u32 addr_cells, size_cells, reg_cells;
+ unsigned int nr_banks, gbank, bank = 0;
+ const uint64_t rambase[] = GUEST_RAM_BANK_BASES;
+ const uint64_t ramsize[] = GUEST_RAM_BANK_SIZES;
+ const __be32 *cell;
+ u64 tot_size = 0;
+ paddr_t pbase, psize, gsize;
+ mfn_t smfn;
+ int res;
+
+ prop = dt_find_property(node, "xen,static-mem", NULL);
+ if ( !dt_property_read_u32(node, "#xen,static-mem-address-cells",
+ &addr_cells) )
+ {
+ printk(XENLOG_ERR
+ "%pd: failed to read \"#xen,static-mem-address-cells\".\n", d);
+ goto fail;
+ }
+
+ if ( !dt_property_read_u32(node, "#xen,static-mem-size-cells",
+ &size_cells) )
+ {
+ printk(XENLOG_ERR
+ "%pd: failed to read \"#xen,static-mem-size-cells\".\n", d);
+ goto fail;
+ }
+ reg_cells = addr_cells + size_cells;
+
+ /*
+ * The static memory will be mapped in the guest at the usual guest memory
+ * addresses (GUEST_RAM0_BASE, GUEST_RAM1_BASE) defined by
+ * xen/include/public/arch-arm.h.
+ */
+ gbank = 0;
+ gsize = ramsize[gbank];
+ kinfo->mem.bank[gbank].start = rambase[gbank];
+
+ cell = (const __be32 *)prop->value;
+ nr_banks = (prop->length) / (reg_cells * sizeof (u32));
+
+ for ( ; bank < nr_banks; bank++ )
+ {
+ device_tree_get_reg(&cell, addr_cells, size_cells, &pbase, &psize);
+ ASSERT(IS_ALIGNED(pbase, PAGE_SIZE) && IS_ALIGNED(psize, PAGE_SIZE));
+
+ smfn = maddr_to_mfn(pbase);
+ res = acquire_domstatic_pages(d, smfn, PFN_DOWN(psize), 0);
+ if ( res )
+ {
+ printk(XENLOG_ERR
+ "%pd: failed to acquire static memory: %d.\n", d, res);
+ goto fail;
+ }
+
+ printk(XENLOG_INFO "%pd: STATIC BANK[%u] %#"PRIpaddr"-%#"PRIpaddr"\n",
+ d, bank, pbase, pbase + psize);
+
+ while ( 1 )
+ {
+ /* Map as much as possible the static range to the guest bank */
+ if ( !append_static_memory_to_bank(d, &kinfo->mem.bank[gbank],
smfn,
+ min(psize, gsize)) )
+ goto fail;
+
+ /*
+ * The current physical bank is fully mapped.
+ * Handle the next physical bank.
+ */
+ if ( gsize >= psize )
+ {
+ gsize = gsize - psize;
+ break;
+ }
+ /*
+ * When current guest bank is not enough to map, exhaust
+ * the current one and seek to the next.
+ * Before seeking to the next, check if we still have available
+ * guest bank.
+ */
+ else if ( (gbank + 1) >= GUEST_RAM_BANKS )
+ {
+ printk(XENLOG_ERR "Exhausted all possible guest banks.\n");
+ goto fail;
+ }
+ else
+ {
+ psize = psize - gsize;
+ smfn = mfn_add(smfn, gsize >> PAGE_SHIFT);
+ /* Update to the next guest bank. */
+ gbank++;
+ gsize = ramsize[gbank];
+ kinfo->mem.bank[gbank].start = rambase[gbank];
+ }
+ }
+
+ tot_size += psize;
+ }
+
+ kinfo->mem.nr_banks = ++gbank;
+
+ kinfo->unassigned_mem -= tot_size;
+ /*
+ * The property 'memory' should match the amount of memory given to the
+ * guest.
+ * Currently, it is only possible to either acquire static memory or let
+ * Xen allocate. *Mixing* is not supported'.
+ */
+ if ( kinfo->unassigned_mem )
+ {
+ printk(XENLOG_ERR
+ "Size of \"memory\" property doesn't match up with the sum-up
of \"xen,static-mem\". Unsupported configuration.\n");
+ goto fail;
+ }
+
+ return;
+
+ fail:
+ panic("Failed to allocate requested static memory for domain %pd.", d);
+}
+#else
+static void __init allocate_static_memory(struct domain *d,
+ struct kernel_info *kinfo,
+ const struct dt_device_node *node)
+{
+}
+#endif
+
static int __init write_properties(struct domain *d, struct kernel_info *kinfo,
const struct dt_device_node *node)
{
@@ -2453,7 +2609,10 @@ static int __init construct_domU(struct domain *d,
/* type must be set before allocate memory */
d->arch.type = kinfo.type;
#endif
- allocate_memory(d, &kinfo);
+ if ( !dt_find_property(node, "xen,static-mem", NULL) )
+ allocate_memory(d, &kinfo);
+ else
+ allocate_static_memory(d, &kinfo, node);
rc = prepare_dtb_domU(d, &kinfo);
if ( rc < 0 )
diff --git a/xen/arch/arm/p2m.c b/xen/arch/arm/p2m.c
index eff9a105e7..6e01e83967 100644
--- a/xen/arch/arm/p2m.c
+++ b/xen/arch/arm/p2m.c
@@ -1293,11 +1293,8 @@ out:
return resolved;
}
-static inline int p2m_insert_mapping(struct domain *d,
- gfn_t start_gfn,
- unsigned long nr,
- mfn_t mfn,
- p2m_type_t t)
+int p2m_insert_mapping(struct domain *d, gfn_t start_gfn, unsigned long nr,
+ mfn_t mfn, p2m_type_t t)
{
struct p2m_domain *p2m = p2m_get_hostp2m(d);
int rc;
diff --git a/xen/include/asm-arm/p2m.h b/xen/include/asm-arm/p2m.h
index 6a2108398f..f885cc522b 100644
--- a/xen/include/asm-arm/p2m.h
+++ b/xen/include/asm-arm/p2m.h
@@ -300,6 +300,9 @@ int map_dev_mmio_region(struct domain *d,
unsigned long nr,
mfn_t mfn);
+int p2m_insert_mapping(struct domain *d, gfn_t start_gfn, unsigned long nr,
+ mfn_t mfn, p2m_type_t t);
+
int guest_physmap_add_entry(struct domain *d,
gfn_t gfn,
mfn_t mfn,
@@ -315,6 +318,14 @@ static inline int guest_physmap_add_page(struct domain *d,
return guest_physmap_add_entry(d, gfn, mfn, page_order, p2m_ram_rw);
}
+static inline int guest_physmap_add_pages(struct domain *d,
+ gfn_t gfn,
+ mfn_t mfn,
+ unsigned int nr_pages)
+{
+ return p2m_insert_mapping(d, gfn, nr_pages, mfn, p2m_ram_rw);
+}
+
mfn_t gfn_to_mfn(struct domain *d, gfn_t gfn);
/* Look up a GFN and take a reference count on the backing page. */
--
2.25.1
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