cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
Log | Files | Refs | README | LICENSE | sfeed.txt

biomerge.c (617B)

      1// SPDX-License-Identifier: GPL-2.0
      2#include <linux/bio.h>
      3#include <linux/export.h>
      4#include <xen/xen.h>
      5#include <xen/page.h>
      6
      7/* check if @page can be merged with 'vec1' */
      8bool xen_biovec_phys_mergeable(const struct bio_vec *vec1,
      9			       const struct page *page)
     10{
     11#if XEN_PAGE_SIZE == PAGE_SIZE
     12	unsigned long bfn1 = pfn_to_bfn(page_to_pfn(vec1->bv_page));
     13	unsigned long bfn2 = pfn_to_bfn(page_to_pfn(page));
     14
     15	return bfn1 + PFN_DOWN(vec1->bv_offset + vec1->bv_len) == bfn2;
     16#else
     17	/*
     18	 * XXX: Add support for merging bio_vec when using different page
     19	 * size in Xen and Linux.
     20	 */
     21	return false;
     22#endif
     23}