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hv: page: add free_page

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Add free_page to free page when unmap pagetable.

Signed-off-by: Li Fei1 <fei1.li@intel.com>
Acked-by: Eddie Dong <eddie.dong@intel.com>
Tracked-On: #5788
This commit is contained in:
Li Fei1
2021-02-19 14:27:35 +08:00
committed by wenlingz
parent 04a104e856
commit 38be61e374
3 changed files with 42 additions and 2 deletions
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14
hypervisor/arch/x86/page.c
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@@ -73,6 +73,20 @@ struct page *alloc_page(struct page_pool *pool)
return page;
}
/*
*@pre: ((page - pool->start_page) >> 6U) < pool->bitmap_size
*/
void free_page(struct page_pool *pool, struct page *page)
{
uint64_t idx, bit;
spinlock_obtain(&pool->lock);
idx = (page - pool->start_page) >> 6U;
bit = (page - pool->start_page) & 0x3fUL;
bitmap_clear_nolock(bit, pool->bitmap + idx);
spinlock_release(&pool->lock);
}
/* @pre: The PPT and EPT have same page granularity */
static inline bool large_page_support(enum _page_table_level level)
{