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x86/paravirt: remove lazy mode in interrupts

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Impact: simplification, robustness

Make paravirt_lazy_mode() always return PARAVIRT_LAZY_NONE
when in an interrupt.  This prevents interrupt code from
accidentally inheriting an outer lazy state, and instead
does everything synchronously.  Outer batched operations
are left deferred.

Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
Acked-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Thomas Gleixner <tglx@linutronix.de>
This commit is contained in:
Jeremy Fitzhardinge 2009-02-17 23:05:19 -08:00
parent a8a93f3f03
commit b8bcfe997e
5 changed files with 5 additions and 21 deletions
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3
arch/x86/kernel/paravirt.c
View file

@ -282,6 +282,9 @@ void paravirt_leave_lazy_cpu(void)
enum paravirt_lazy_mode paravirt_get_lazy_mode(void)
{
if (in_interrupt())
return PARAVIRT_LAZY_NONE;
return __get_cpu_var(paravirt_lazy_mode);
}

6
arch/x86/mm/fault.c
View file

@ -225,12 +225,10 @@ static inline pmd_t *vmalloc_sync_one(pgd_t *pgd, unsigned long address)
if (!pmd_present(*pmd_k))
return NULL;
if (!pmd_present(*pmd)) {
if (!pmd_present(*pmd))
set_pmd(pmd, *pmd_k);
arch_flush_lazy_mmu_mode();
} else {
else
BUG_ON(pmd_page(*pmd) != pmd_page(*pmd_k));
}
return pmd_k;
}

2
arch/x86/mm/highmem_32.c
View file

@ -87,7 +87,6 @@ void *kmap_atomic_prot(struct page *page, enum km_type type, pgprot_t prot)
vaddr = __fix_to_virt(FIX_KMAP_BEGIN + idx);
BUG_ON(!pte_none(*(kmap_pte-idx)));
set_pte(kmap_pte-idx, mk_pte(page, prot));
arch_flush_lazy_mmu_mode();
return (void *)vaddr;
}
@ -117,7 +116,6 @@ void kunmap_atomic(void *kvaddr, enum km_type type)
#endif
}
arch_flush_lazy_mmu_mode();
pagefault_enable();
}

1
arch/x86/mm/iomap_32.c
View file

@ -74,7 +74,6 @@ iounmap_atomic(void *kvaddr, enum km_type type)
if (vaddr == __fix_to_virt(FIX_KMAP_BEGIN+idx))
kpte_clear_flush(kmap_pte-idx, vaddr);
arch_flush_lazy_mmu_mode();
pagefault_enable();
}
EXPORT_SYMBOL_GPL(iounmap_atomic);

14
arch/x86/mm/pageattr.c
View file

@ -824,13 +824,6 @@ static int change_page_attr_set_clr(unsigned long *addr, int numpages,
vm_unmap_aliases();
/*
* If we're called with lazy mmu updates enabled, the
* in-memory pte state may be stale. Flush pending updates to
* bring them up to date.
*/
arch_flush_lazy_mmu_mode();
cpa.vaddr = addr;
cpa.numpages = numpages;
cpa.mask_set = mask_set;
@ -873,13 +866,6 @@ static int change_page_attr_set_clr(unsigned long *addr, int numpages,
} else
cpa_flush_all(cache);
/*
* If we've been called with lazy mmu updates enabled, then
* make sure that everything gets flushed out before we
* return.
*/
arch_flush_lazy_mmu_mode();
out:
return ret;
}