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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>
Signed-off-by: Marc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/20210608114518.748712-7-qperret@google.com
This commit is contained in:
Quentin Perret 2021-06-08 11:45:17 +00:00 committed by Marc Zyngier
parent d978b9cfe6
commit 87ec060673
3 changed files with 10 additions and 10 deletions
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6
arch/arm64/kvm/hyp/include/nvhe/gfp.h
View File

@ -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);

2
arch/arm64/kvm/hyp/include/nvhe/memory.h
View File

@ -9,7 +9,7 @@
struct hyp_page {
unsigned int refcount;
unsigned int order;
unsigned short order;
};
extern u64 __hyp_vmemmap;

12
arch/arm64/kvm/hyp/nvhe/page_alloc.c
View File

@ -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);