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io_uring: use vmap() for ring mapping

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This is the last holdout which does odd page checking, convert it to
vmap just like what is done for the non-mmap path.

Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Jens Axboe 2024-03-13 14:10:40 -06:00
parent 3ab1db3c60
commit 09fc75e0c0
1 changed files with 9 additions and 29 deletions
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38
io_uring/io_uring.c
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@ -63,7 +63,6 @@
#include <linux/sched/mm.h>
#include <linux/uaccess.h>
#include <linux/nospec.h>
#include <linux/highmem.h>
#include <linux/fsnotify.h>
#include <linux/fadvise.h>
#include <linux/task_work.h>
@ -2657,7 +2656,7 @@ static void *__io_uaddr_map(struct page ***pages, unsigned short *npages,
struct page **page_array;
unsigned int nr_pages;
void *page_addr;
int ret, i, pinned;
int ret, pinned;
*npages = 0;
@ -2679,34 +2678,13 @@ static void *__io_uaddr_map(struct page ***pages, unsigned short *npages,
goto free_pages;
}
page_addr = page_address(page_array[0]);
for (i = 0; i < nr_pages; i++) {
ret = -EINVAL;
/*
* Can't support mapping user allocated ring memory on 32-bit
* archs where it could potentially reside in highmem. Just
* fail those with -EINVAL, just like we did on kernels that
* didn't support this feature.
*/
if (PageHighMem(page_array[i]))
goto free_pages;
/*
* No support for discontig pages for now, should either be a
* single normal page, or a huge page. Later on we can add
* support for remapping discontig pages, for now we will
* just fail them with EINVAL.
*/
if (page_address(page_array[i]) != page_addr)
goto free_pages;
page_addr += PAGE_SIZE;
page_addr = vmap(page_array, nr_pages, VM_MAP, PAGE_KERNEL);
if (page_addr) {
*pages = page_array;
*npages = nr_pages;
return page_addr;
}
*pages = page_array;
*npages = nr_pages;
return page_to_virt(page_array[0]);
ret = -ENOMEM;
free_pages:
io_pages_free(&page_array, pinned > 0 ? pinned : 0);
return ERR_PTR(ret);
@ -2736,6 +2714,8 @@ static void io_rings_free(struct io_ring_ctx *ctx)
ctx->n_ring_pages = 0;
io_pages_free(&ctx->sqe_pages, ctx->n_sqe_pages);
ctx->n_sqe_pages = 0;
vunmap(ctx->rings);
vunmap(ctx->sq_sqes);
}
ctx->rings = NULL;