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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-devel] [PATCH RFC 13/18] xen: introduce and use 'dom0_rambase_pfn' setting for kernel Dom0
From: Oleksandr Dmytryshyn <oleksandr.dmytryshyn@xxxxxxxxxxxxxxx>
This setting is used to adjust starting memory address allocated
for kernel Dom0. To use 'rambase_pfn' setting just add for example
'dom0_rambase_pfn=0x80000' to the hypervisor command line. Note that
'dom0_rambase_pfn' should be aligned with the smallest memory chunk
which use xen memory allocator.
Signed-off-by: Oleksandr Dmytryshyn <oleksandr.dmytryshyn@xxxxxxxxxxxxxxx>
---
xen/arch/arm/domain_build.c | 24 +++++++++++++---
xen/common/page_alloc.c | 68 +++++++++++++++++++++++++++++++++++----------
xen/include/xen/mm.h | 2 ++
3 files changed, 75 insertions(+), 19 deletions(-)
diff --git a/xen/arch/arm/domain_build.c b/xen/arch/arm/domain_build.c
index 2937ff7..b48718d 100644
--- a/xen/arch/arm/domain_build.c
+++ b/xen/arch/arm/domain_build.c
@@ -27,6 +27,9 @@
static unsigned int __initdata opt_dom0_max_vcpus;
integer_param("dom0_max_vcpus", opt_dom0_max_vcpus);
+static u64 __initdata opt_dom0_rambase_pfn = 0;
+integer_param("dom0_rambase_pfn", opt_dom0_rambase_pfn);
+
int dom0_11_mapping = 1;
#define DOM0_MEM_DEFAULT 0x8000000 /* 128 MiB */
@@ -248,6 +251,8 @@ static void allocate_memory_11(struct domain *d, struct
kernel_info *kinfo)
const unsigned int min_order = get_order_from_bytes(MB(4));
struct page_info *pg;
unsigned int order = get_11_allocation_size(kinfo->unassigned_mem);
+ u64 rambase_pfn = opt_dom0_rambase_pfn;
+ paddr_t mem_size = kinfo->unassigned_mem;
int i;
bool_t lowmem = is_32bit_domain(d);
@@ -267,7 +272,7 @@ static void allocate_memory_11(struct domain *d, struct
kernel_info *kinfo)
{
for ( bits = order ; bits <= (lowmem ? 32 : PADDR_BITS); bits++ )
{
- pg = alloc_domheap_pages(d, order, MEMF_bits(bits));
+ pg = alloc_domheap_pages_pfn(d, order, MEMF_bits(bits),
rambase_pfn);
if ( pg != NULL )
goto got_bank0;
}
@@ -284,16 +289,21 @@ static void allocate_memory_11(struct domain *d, struct
kernel_info *kinfo)
/* Now allocate more memory and fill in additional banks */
order = get_11_allocation_size(kinfo->unassigned_mem);
+ if ( opt_dom0_rambase_pfn )
+ rambase_pfn += (mem_size - kinfo->unassigned_mem) >> PAGE_SHIFT;
+
while ( kinfo->unassigned_mem && kinfo->mem.nr_banks < NR_MEM_BANKS )
{
- pg = alloc_domheap_pages(d, order, lowmem ? MEMF_bits(32) : 0);
+ pg = alloc_domheap_pages_pfn(d, order, lowmem ? MEMF_bits(32) : 0,
+ rambase_pfn);
if ( !pg )
{
order --;
if ( lowmem && order < min_low_order)
{
- D11PRINT("Failed at min_low_order, allow high allocations\n");
+ if ( !opt_dom0_rambase_pfn )
+ D11PRINT("Failed at min_low_order, allow high
allocations\n");
order = get_11_allocation_size(kinfo->unassigned_mem);
lowmem = false;
continue;
@@ -313,7 +323,8 @@ static void allocate_memory_11(struct domain *d, struct
kernel_info *kinfo)
if ( lowmem )
{
- D11PRINT("Allocation below bank 0, allow high allocations\n");
+ if ( !opt_dom0_rambase_pfn )
+ D11PRINT("Allocation below bank 0, allow high
allocations\n");
order = get_11_allocation_size(kinfo->unassigned_mem);
lowmem = false;
continue;
@@ -330,6 +341,11 @@ static void allocate_memory_11(struct domain *d, struct
kernel_info *kinfo)
* allocation possible.
*/
order = get_11_allocation_size(kinfo->unassigned_mem);
+ if ( opt_dom0_rambase_pfn )
+ {
+ rambase_pfn += (mem_size - kinfo->unassigned_mem) >> PAGE_SHIFT;
+ mem_size = kinfo->unassigned_mem;
+ }
}
if ( kinfo->unassigned_mem )
diff --git a/xen/common/page_alloc.c b/xen/common/page_alloc.c
index 74fc1de..d0c0fbb 100644
--- a/xen/common/page_alloc.c
+++ b/xen/common/page_alloc.c
@@ -583,16 +583,17 @@ static void check_low_mem_virq(void)
}
}
-/* Allocate 2^@order contiguous pages. */
-static struct page_info *alloc_heap_pages(
+/* Allocate 2^@order contiguous pages at given pfn. */
+static struct page_info *alloc_heap_pages_pfn(
unsigned int zone_lo, unsigned int zone_hi,
unsigned int order, unsigned int memflags,
- struct domain *d)
+ struct domain *d, xen_pfn_t pfn)
{
unsigned int i, j, zone = 0, nodemask_retry = 0;
nodeid_t first_node, node = MEMF_get_node(memflags), req_node = node;
unsigned long request = 1UL << order;
- struct page_info *pg;
+ struct page_info *pg, *tmp_pg;
+ struct page_list_head *pg_list;
nodemask_t nodemask = (d != NULL ) ? d->node_affinity : node_online_map;
bool_t need_tlbflush = 0;
uint32_t tlbflush_timestamp = 0;
@@ -657,9 +658,25 @@ static struct page_info *alloc_heap_pages(
continue;
/* Find smallest order which can satisfy the request. */
- for ( j = order; j <= MAX_ORDER; j++ )
- if ( (pg = page_list_remove_head(&heap(node, zone, j))) )
- goto found;
+ for ( j = order; j <= MAX_ORDER; j++ ) {
+ pg_list = &heap(node, zone, j);
+ if ( pfn )
+ {
+ page_list_for_each_safe( pg, tmp_pg, pg_list )
+ {
+ if ( pfn == page_to_mfn(pg) )
+ {
+ page_list_del(pg, pg_list);
+ goto found;
+ }
+ }
+ }
+ else
+ {
+ if ( (pg = page_list_remove_head(pg_list)) )
+ goto found;
+ }
+ }
} while ( zone-- > zone_lo ); /* careful: unsigned zone may wrap */
if ( (memflags & MEMF_exact_node) && req_node != NUMA_NO_NODE )
@@ -706,9 +723,15 @@ static struct page_info *alloc_heap_pages(
/* We may have to halve the chunk a number of times. */
while ( j != order )
{
- PFN_ORDER(pg) = --j;
- page_list_add_tail(pg, &heap(node, zone, j));
- pg += 1 << j;
+ tmp_pg = pg;
+ if ( pfn )
+ tmp_pg += 1 << (j - 1);
+
+ PFN_ORDER(tmp_pg) = --j;
+ page_list_add_tail(tmp_pg, &heap(node, zone, j));
+
+ if ( !pfn )
+ pg += 1 << j;
}
ASSERT(avail[node][zone] >= request);
@@ -762,6 +785,15 @@ static struct page_info *alloc_heap_pages(
return pg;
}
+/* Allocate 2^@order contiguous pages. */
+static struct page_info *alloc_heap_pages(
+ unsigned int zone_lo, unsigned int zone_hi,
+ unsigned int order, unsigned int memflags,
+ struct domain *d)
+{
+ return alloc_heap_pages_pfn(zone_lo, zone_hi, order, memflags, d, 0);
+}
+
/* Remove any offlined page in the buddy pointed to by head. */
static int reserve_offlined_page(struct page_info *head)
{
@@ -1687,8 +1719,8 @@ int assign_pages(
}
-struct page_info *alloc_domheap_pages(
- struct domain *d, unsigned int order, unsigned int memflags)
+struct page_info *alloc_domheap_pages_pfn(
+ struct domain *d, unsigned int order, unsigned int memflags, xen_pfn_t pfn)
{
struct page_info *pg = NULL;
unsigned int bits = memflags >> _MEMF_bits, zone_hi = NR_ZONES - 1;
@@ -1705,12 +1737,12 @@ struct page_info *alloc_domheap_pages(
memflags |= MEMF_no_refcount;
if ( dma_bitsize && ((dma_zone = bits_to_zone(dma_bitsize)) < zone_hi) )
- pg = alloc_heap_pages(dma_zone + 1, zone_hi, order, memflags, d);
+ pg = alloc_heap_pages_pfn(dma_zone + 1, zone_hi, order, memflags, d,
pfn);
if ( (pg == NULL) &&
((memflags & MEMF_no_dma) ||
- ((pg = alloc_heap_pages(MEMZONE_XEN + 1, zone_hi, order,
- memflags, d)) == NULL)) )
+ ((pg = alloc_heap_pages_pfn(MEMZONE_XEN + 1, zone_hi, order,
+ memflags, d, pfn)) == NULL)) )
return NULL;
if ( d && !(memflags & MEMF_no_owner) &&
@@ -1723,6 +1755,12 @@ struct page_info *alloc_domheap_pages(
return pg;
}
+struct page_info *alloc_domheap_pages(
+ struct domain *d, unsigned int order, unsigned int memflags)
+{
+ return alloc_domheap_pages_pfn(d, order, memflags, 0);
+}
+
void free_domheap_pages(struct page_info *pg, unsigned int order)
{
struct domain *d = page_get_owner(pg);
diff --git a/xen/include/xen/mm.h b/xen/include/xen/mm.h
index a795dd6..83e4913 100644
--- a/xen/include/xen/mm.h
+++ b/xen/include/xen/mm.h
@@ -117,6 +117,8 @@ void get_outstanding_claims(uint64_t *free_pages, uint64_t
*outstanding_pages);
/* Domain suballocator. These functions are *not* interrupt-safe.*/
void init_domheap_pages(paddr_t ps, paddr_t pe);
+struct page_info *alloc_domheap_pages_pfn(
+ struct domain *d, unsigned int order, unsigned int memflags, xen_pfn_t
pfn);
struct page_info *alloc_domheap_pages(
struct domain *d, unsigned int order, unsigned int memflags);
void free_domheap_pages(struct page_info *pg, unsigned int order);
--
2.8.2
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