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Subject[PATCH v3 6/7] KVM: arm64: Use less bits for hyp_page order
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The hyp_page order is currently encoded on 4 bytes even though it is
guaranteed to be smaller than this. Make it 2 bytes to reduce the hyp
vmemmap overhead.

Signed-off-by: Quentin Perret <qperret@google.com>
---
arch/arm64/kvm/hyp/include/nvhe/gfp.h | 6 +++---
arch/arm64/kvm/hyp/include/nvhe/memory.h | 2 +-
arch/arm64/kvm/hyp/nvhe/page_alloc.c | 12 ++++++------
3 files changed, 10 insertions(+), 10 deletions(-)

diff --git a/arch/arm64/kvm/hyp/include/nvhe/gfp.h b/arch/arm64/kvm/hyp/include/nvhe/gfp.h
index 3ea7bfb6c380..fb0f523d1492 100644
--- a/arch/arm64/kvm/hyp/include/nvhe/gfp.h
+++ b/arch/arm64/kvm/hyp/include/nvhe/gfp.h
@@ -7,7 +7,7 @@
#include <nvhe/memory.h>
#include <nvhe/spinlock.h>

-#define HYP_NO_ORDER UINT_MAX
+#define HYP_NO_ORDER USHRT_MAX

struct hyp_pool {
/*
@@ -19,11 +19,11 @@ struct hyp_pool {
struct list_head free_area[MAX_ORDER];
phys_addr_t range_start;
phys_addr_t range_end;
- unsigned int max_order;
+ unsigned short max_order;
};

/* Allocation */
-void *hyp_alloc_pages(struct hyp_pool *pool, unsigned int order);
+void *hyp_alloc_pages(struct hyp_pool *pool, unsigned short order);
void hyp_get_page(struct hyp_pool *pool, void *addr);
void hyp_put_page(struct hyp_pool *pool, void *addr);

diff --git a/arch/arm64/kvm/hyp/include/nvhe/memory.h b/arch/arm64/kvm/hyp/include/nvhe/memory.h
index 991636be2f46..3fe34fa30ea4 100644
--- a/arch/arm64/kvm/hyp/include/nvhe/memory.h
+++ b/arch/arm64/kvm/hyp/include/nvhe/memory.h
@@ -9,7 +9,7 @@

struct hyp_page {
unsigned int refcount;
- unsigned int order;
+ unsigned short order;
};

extern u64 __hyp_vmemmap;
diff --git a/arch/arm64/kvm/hyp/nvhe/page_alloc.c b/arch/arm64/kvm/hyp/nvhe/page_alloc.c
index e3689def7033..be07055bbc10 100644
--- a/arch/arm64/kvm/hyp/nvhe/page_alloc.c
+++ b/arch/arm64/kvm/hyp/nvhe/page_alloc.c
@@ -32,7 +32,7 @@ u64 __hyp_vmemmap;
*/
static struct hyp_page *__find_buddy_nocheck(struct hyp_pool *pool,
struct hyp_page *p,
- unsigned int order)
+ unsigned short order)
{
phys_addr_t addr = hyp_page_to_phys(p);

@@ -51,7 +51,7 @@ static struct hyp_page *__find_buddy_nocheck(struct hyp_pool *pool,
/* Find a buddy page currently available for allocation */
static struct hyp_page *__find_buddy_avail(struct hyp_pool *pool,
struct hyp_page *p,
- unsigned int order)
+ unsigned short order)
{
struct hyp_page *buddy = __find_buddy_nocheck(pool, p, order);

@@ -93,7 +93,7 @@ static inline struct hyp_page *node_to_page(struct list_head *node)
static void __hyp_attach_page(struct hyp_pool *pool,
struct hyp_page *p)
{
- unsigned int order = p->order;
+ unsigned short order = p->order;
struct hyp_page *buddy;

memset(hyp_page_to_virt(p), 0, PAGE_SIZE << p->order);
@@ -123,7 +123,7 @@ static void __hyp_attach_page(struct hyp_pool *pool,

static struct hyp_page *__hyp_extract_page(struct hyp_pool *pool,
struct hyp_page *p,
- unsigned int order)
+ unsigned short order)
{
struct hyp_page *buddy;

@@ -192,9 +192,9 @@ void hyp_get_page(struct hyp_pool *pool, void *addr)
hyp_spin_unlock(&pool->lock);
}

-void *hyp_alloc_pages(struct hyp_pool *pool, unsigned int order)
+void *hyp_alloc_pages(struct hyp_pool *pool, unsigned short order)
{
- unsigned int i = order;
+ unsigned short i = order;
struct hyp_page *p;

hyp_spin_lock(&pool->lock);
--
2.32.0.rc1.229.g3e70b5a671-goog
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