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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>
This commit is contained in:
Peter Zijlstra 2018-12-03 18:03:47 +01:00 committed by Ingo Molnar
parent 16ebf031e8
commit 98bfc9b038
1 changed files with 8 additions and 10 deletions
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18
arch/x86/mm/pageattr.c
View File

@ -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;
}