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Diffstat (limited to 'arch/powerpc/kernel/paca.c')
-rw-r--r--arch/powerpc/kernel/paca.c13
1 files changed, 10 insertions, 3 deletions
diff --git a/arch/powerpc/kernel/paca.c b/arch/powerpc/kernel/paca.c
index 74da65aacbc9..0ad15768d762 100644
--- a/arch/powerpc/kernel/paca.c
+++ b/arch/powerpc/kernel/paca.c
@@ -57,8 +57,8 @@ static void *__init alloc_paca_data(unsigned long size, unsigned long align,
#define LPPACA_SIZE 0x400
-static void *__init alloc_shared_lppaca(unsigned long size, unsigned long align,
- unsigned long limit, int cpu)
+static void *__init alloc_shared_lppaca(unsigned long size, unsigned long limit,
+ int cpu)
{
size_t shared_lppaca_total_size = PAGE_ALIGN(nr_cpu_ids * LPPACA_SIZE);
static unsigned long shared_lppaca_size;
@@ -68,6 +68,13 @@ static void *__init alloc_shared_lppaca(unsigned long size, unsigned long align,
if (!shared_lppaca) {
memblock_set_bottom_up(true);
+ /*
+ * See Documentation/powerpc/ultravisor.rst for more details.
+ *
+ * UV/HV data sharing is in PAGE_SIZE granularity. In order to
+ * minimize the number of pages shared, align the allocation to
+ * PAGE_SIZE.
+ */
shared_lppaca =
memblock_alloc_try_nid(shared_lppaca_total_size,
PAGE_SIZE, MEMBLOCK_LOW_LIMIT,
@@ -122,7 +129,7 @@ static struct lppaca * __init new_lppaca(int cpu, unsigned long limit)
return NULL;
if (is_secure_guest())
- lp = alloc_shared_lppaca(LPPACA_SIZE, 0x400, limit, cpu);
+ lp = alloc_shared_lppaca(LPPACA_SIZE, limit, cpu);
else
lp = alloc_paca_data(LPPACA_SIZE, 0x400, limit, cpu);