diff options
| author | Peter Zijlstra <peterz@infradead.org> | 2018-12-03 20:03:47 +0300 |
|---|---|---|
| committer | Ingo Molnar <mingo@kernel.org> | 2018-12-17 20:54:24 +0300 |
| commit | 98bfc9b038cde1ce108f69a50720e394fe774cb7 (patch) | |
| tree | 522346cf6cb45c13d17713314494db084537bb97 /arch/x86/mm | |
| parent | 16ebf031e8ab73779a382c9f2b097891da6af923 (diff) | |
| download | linux-98bfc9b038cde1ce108f69a50720e394fe774cb7.tar.xz | |
x86/mm/cpa: Make cpa_data::vaddr invariant
Currently __change_page_attr_set_clr() will modify cpa->vaddr when
!(CPA_ARRAY | CPA_PAGES_ARRAY), whereas in the array cases it will
increment cpa->curpage.
Change __cpa_addr() such that its @idx argument also works in the
!array case and use cpa->curpage increments for all cases.
NOTE: since cpa_data::numpages is 'unsigned long' so should cpa_data::curpage be.
NOTE: after this only cpa->numpages is still modified.
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Rik van Riel <riel@surriel.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Tom.StDenis@amd.com
Cc: dave.hansen@intel.com
Link: http://lkml.kernel.org/r/20181203171043.295174892@infradead.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'arch/x86/mm')
| -rw-r--r-- | arch/x86/mm/pageattr.c | 18 |
1 files changed, 8 insertions, 10 deletions
diff --git a/arch/x86/mm/pageattr.c b/arch/x86/mm/pageattr.c index 6e6900ebea30..ce8af3f08628 100644 --- a/arch/x86/mm/pageattr.c +++ b/arch/x86/mm/pageattr.c @@ -35,11 +35,11 @@ struct cpa_data { pgprot_t mask_set; pgprot_t mask_clr; unsigned long numpages; - int flags; + unsigned long curpage; unsigned long pfn; - unsigned force_split : 1, + unsigned int flags; + unsigned int force_split : 1, force_static_prot : 1; - int curpage; struct page **pages; }; @@ -228,7 +228,7 @@ static bool __cpa_pfn_in_highmap(unsigned long pfn) #endif -static unsigned long __cpa_addr(struct cpa_data *cpa, int idx) +static unsigned long __cpa_addr(struct cpa_data *cpa, unsigned long idx) { if (cpa->flags & CPA_PAGES_ARRAY) { struct page *page = cpa->pages[idx]; @@ -242,7 +242,7 @@ static unsigned long __cpa_addr(struct cpa_data *cpa, int idx) if (cpa->flags & CPA_ARRAY) return cpa->vaddr[idx]; - return *cpa->vaddr; + return *cpa->vaddr + idx * PAGE_SIZE; } /* @@ -1581,6 +1581,7 @@ static int cpa_process_alias(struct cpa_data *cpa) alias_cpa = *cpa; alias_cpa.vaddr = &laddr; alias_cpa.flags &= ~(CPA_PAGES_ARRAY | CPA_ARRAY); + alias_cpa.curpage = 0; ret = __change_page_attr_set_clr(&alias_cpa, 0); if (ret) @@ -1600,6 +1601,7 @@ static int cpa_process_alias(struct cpa_data *cpa) alias_cpa = *cpa; alias_cpa.vaddr = &temp_cpa_vaddr; alias_cpa.flags &= ~(CPA_PAGES_ARRAY | CPA_ARRAY); + alias_cpa.curpage = 0; /* * The high mapping range is imprecise, so ignore the @@ -1648,11 +1650,7 @@ static int __change_page_attr_set_clr(struct cpa_data *cpa, int checkalias) */ BUG_ON(cpa->numpages > numpages || !cpa->numpages); numpages -= cpa->numpages; - if (cpa->flags & (CPA_PAGES_ARRAY | CPA_ARRAY)) - cpa->curpage++; - else - *cpa->vaddr += cpa->numpages * PAGE_SIZE; - + cpa->curpage += cpa->numpages; } return 0; } |