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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-devel] [PATCH v4 06/12] xen/arm: compile and initialize vmap
Rename EARLY_VMAP_VIRT_END and EARLY_VMAP_VIRT_START to
VMAP_VIRT_END and VMAP_VIRT_START.
Defining VMAP_VIRT_START triggers the compilation of common/vmap.c.
Define PAGE_HYPERVISOR and MAP_SMALL_PAGES (unused on ARM, because we
only support 4K pages so as a matter of fact it is always set).
Implement map_pages_to_xen and destroy_xen_mappings.
Call vm_init from start_xen.
Changes in v4:
- remove flush_tlb_local() from create_xen_entries;
- return error if a mapping is already present.
Signed-off-by: Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx>
---
xen/arch/arm/mm.c | 101 ++++++++++++++++++++++++++++++++++++++++-
xen/arch/arm/setup.c | 3 +
xen/include/asm-arm/config.h | 4 +-
xen/include/asm-arm/page.h | 3 +
xen/include/asm-x86/page.h | 8 ---
xen/include/xen/mm.h | 7 +++
6 files changed, 113 insertions(+), 13 deletions(-)
diff --git a/xen/arch/arm/mm.c b/xen/arch/arm/mm.c
index ceca674..3c0b0f0 100644
--- a/xen/arch/arm/mm.c
+++ b/xen/arch/arm/mm.c
@@ -33,6 +33,7 @@
#include <xen/err.h>
#include <asm/page.h>
#include <asm/current.h>
+#include <asm/flushtlb.h>
#include <public/memory.h>
#include <xen/sched.h>
#include <xsm/xsm.h>
@@ -429,9 +430,9 @@ void __init setup_frametable_mappings(paddr_t ps, paddr_t
pe)
/* Map the physical memory range start - start + len into virtual
* memory and return the virtual address of the mapping.
* start has to be 2MB aligned.
- * len has to be < EARLY_VMAP_VIRT_END - EARLY_VMAP_VIRT_START.
+ * len has to be < VMAP_VIRT_END - VMAP_VIRT_START.
*/
-static __initdata unsigned long early_vmap_start = EARLY_VMAP_VIRT_END;
+static __initdata unsigned long early_vmap_start = VMAP_VIRT_END;
void* __init early_ioremap(paddr_t start, size_t len, unsigned attributes)
{
paddr_t end = start + len;
@@ -444,7 +445,7 @@ void* __init early_ioremap(paddr_t start, size_t len,
unsigned attributes)
ASSERT(!(early_vmap_start & (~SECOND_MASK)));
/* The range we need to map is too big */
- if ( early_vmap_start >= EARLY_VMAP_VIRT_START )
+ if ( early_vmap_start >= VMAP_VIRT_START )
return NULL;
map_start = early_vmap_start;
@@ -467,6 +468,100 @@ void *__init arch_vmap_virt_end(void)
return (void *)early_vmap_start;
}
+static int create_xen_table(lpae_t *entry)
+{
+ void *p;
+ lpae_t pte;
+
+ p = alloc_xenheap_pages(0, 0);
+ if ( p == NULL )
+ return -ENOMEM;
+ clear_page(p);
+ pte = mfn_to_xen_entry(virt_to_mfn(p));
+ pte.pt.table = 1;
+ write_pte(entry, pte);
+ return 0;
+}
+
+enum xenmap_operation {
+ INSERT,
+ REMOVE
+};
+
+static int create_xen_entries(enum xenmap_operation op,
+ unsigned long virt,
+ unsigned long mfn,
+ unsigned long nr_mfns)
+{
+ int rc;
+ unsigned long addr = virt, addr_end = addr + nr_mfns * PAGE_SIZE;
+ lpae_t pte;
+ lpae_t *third = NULL;
+
+ for(; addr < addr_end; addr += PAGE_SIZE, mfn++)
+ {
+ if ( !xen_second[second_linear_offset(addr)].pt.valid ||
+ !xen_second[second_linear_offset(addr)].pt.table )
+ {
+ rc = create_xen_table(&xen_second[second_linear_offset(addr)]);
+ if ( rc < 0 ) {
+ printk("create_xen_entries: L2 failed\n");
+ goto out;
+ }
+ }
+
+ BUG_ON(!xen_second[second_linear_offset(addr)].pt.valid);
+
+ third = __va((paddr_t)xen_second[second_linear_offset(addr)].pt.base
+ << PAGE_SHIFT);
+
+ switch ( op ) {
+ case INSERT:
+ if ( third[third_table_offset(addr)].pt.valid )
+ {
+ printk("create_xen_entries: trying to replace an existing
mapping addr=%lx mfn=%lx\n",
+ addr, mfn);
+ return -EINVAL;
+ }
+ pte = mfn_to_xen_entry(mfn);
+ pte.pt.table = 1;
+ write_pte(&third[third_table_offset(addr)], pte);
+ break;
+ case REMOVE:
+ if ( !third[third_table_offset(addr)].pt.valid )
+ {
+ printk("create_xen_entries: trying to remove a
non-existing mapping addr=%lx\n",
+ addr);
+ return -EINVAL;
+ }
+ pte.bits = 0;
+ write_pte(&third[third_table_offset(addr)], pte);
+ break;
+ default:
+ BUG();
+ }
+ }
+ flush_xen_data_tlb_range_va(virt, PAGE_SIZE * nr_mfns);
+
+ rc = 0;
+
+out:
+ return rc;
+}
+
+int map_pages_to_xen(unsigned long virt,
+ unsigned long mfn,
+ unsigned long nr_mfns,
+ unsigned int flags)
+{
+ ASSERT(flags == PAGE_HYPERVISOR);
+ return create_xen_entries(INSERT, virt, mfn, nr_mfns);
+}
+void destroy_xen_mappings(unsigned long v, unsigned long e)
+{
+ create_xen_entries(REMOVE, v, 0, (e - v) >> PAGE_SHIFT);
+}
+
enum mg { mg_clear, mg_ro, mg_rw, mg_rx };
static void set_pte_flags_on_range(const char *p, unsigned long l, enum mg mg)
{
diff --git a/xen/arch/arm/setup.c b/xen/arch/arm/setup.c
index cfe3d94..59646d6 100644
--- a/xen/arch/arm/setup.c
+++ b/xen/arch/arm/setup.c
@@ -34,6 +34,7 @@
#include <xen/keyhandler.h>
#include <xen/cpu.h>
#include <xen/pfn.h>
+#include <xen/vmap.h>
#include <asm/page.h>
#include <asm/current.h>
#include <asm/setup.h>
@@ -480,6 +481,8 @@ void __init start_xen(unsigned long boot_phys_offset,
console_init_postirq();
+ vm_init();
+
do_presmp_initcalls();
for_each_present_cpu ( i )
diff --git a/xen/include/asm-arm/config.h b/xen/include/asm-arm/config.h
index 8be8563..1f87acc 100644
--- a/xen/include/asm-arm/config.h
+++ b/xen/include/asm-arm/config.h
@@ -95,11 +95,11 @@
#define FIXMAP_ADDR(n) (mk_unsigned_long(0x00400000) + (n) * PAGE_SIZE)
#define BOOT_MISC_VIRT_START mk_unsigned_long(0x00600000)
#define FRAMETABLE_VIRT_START mk_unsigned_long(0x02000000)
-#define EARLY_VMAP_VIRT_START mk_unsigned_long(0x10000000)
+#define VMAP_VIRT_START mk_unsigned_long(0x10000000)
#define XENHEAP_VIRT_START mk_unsigned_long(0x40000000)
#define DOMHEAP_VIRT_START mk_unsigned_long(0x80000000)
-#define EARLY_VMAP_VIRT_END XENHEAP_VIRT_START
+#define VMAP_VIRT_END XENHEAP_VIRT_START
#define HYPERVISOR_VIRT_START XEN_VIRT_START
#define DOMHEAP_ENTRIES 1024 /* 1024 2MB mapping slots */
diff --git a/xen/include/asm-arm/page.h b/xen/include/asm-arm/page.h
index 14e63eb..5287a92 100644
--- a/xen/include/asm-arm/page.h
+++ b/xen/include/asm-arm/page.h
@@ -58,6 +58,9 @@
#define DEV_WC BUFFERABLE
#define DEV_CACHED WRITEBACK
+#define PAGE_HYPERVISOR (MATTR_MEM)
+#define MAP_SMALL_PAGES PAGE_HYPERVISOR
+
/*
* Stage 2 Memory Type.
*
diff --git a/xen/include/asm-x86/page.h b/xen/include/asm-x86/page.h
index b2f3859..e53e1e5 100644
--- a/xen/include/asm-x86/page.h
+++ b/xen/include/asm-x86/page.h
@@ -338,14 +338,6 @@ l3_pgentry_t *virt_to_xen_l3e(unsigned long v);
extern void set_pdx_range(unsigned long smfn, unsigned long emfn);
-/* Map machine page range in Xen virtual address space. */
-int map_pages_to_xen(
- unsigned long virt,
- unsigned long mfn,
- unsigned long nr_mfns,
- unsigned int flags);
-void destroy_xen_mappings(unsigned long v, unsigned long e);
-
/* Convert between PAT/PCD/PWT embedded in PTE flags and 3-bit cacheattr. */
static inline uint32_t pte_flags_to_cacheattr(uint32_t flags)
{
diff --git a/xen/include/xen/mm.h b/xen/include/xen/mm.h
index 28512fb..efc45c7 100644
--- a/xen/include/xen/mm.h
+++ b/xen/include/xen/mm.h
@@ -48,6 +48,13 @@ void *alloc_xenheap_pages(unsigned int order, unsigned int
memflags);
void free_xenheap_pages(void *v, unsigned int order);
#define alloc_xenheap_page() (alloc_xenheap_pages(0,0))
#define free_xenheap_page(v) (free_xenheap_pages(v,0))
+/* Map machine page range in Xen virtual address space. */
+int map_pages_to_xen(
+ unsigned long virt,
+ unsigned long mfn,
+ unsigned long nr_mfns,
+ unsigned int flags);
+void destroy_xen_mappings(unsigned long v, unsigned long e);
/* Claim handling */
unsigned long domain_adjust_tot_pages(struct domain *d, long pages);
--
1.7.2.5
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