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exec: make iotlb RCU-friendly

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After the previous patch, TLBs will be flushed on every change to
the memory mapping.  This patch augments that with synchronization
of the MemoryRegionSections referred to in the iotlb array.

With this change, it is guaranteed that iotlb_to_region will access
the correct memory map, even once the TLB will be accessed outside
the BQL.

Reviewed-by: Fam Zheng <famz@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Paolo Bonzini 2013-08-16 08:26:30 +02:00
parent 76e5c76f2e
commit 9d82b5a792
7 changed files with 21 additions and 13 deletions
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13
exec.c
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@ -401,11 +401,12 @@ MemoryRegion *address_space_translate(AddressSpace *as, hwaddr addr,
}
MemoryRegionSection *
address_space_translate_for_iotlb(AddressSpace *as, hwaddr addr, hwaddr *xlat,
hwaddr *plen)
address_space_translate_for_iotlb(CPUState *cpu, hwaddr addr,
hwaddr *xlat, hwaddr *plen)
{
MemoryRegionSection *section;
section = address_space_translate_internal(as->dispatch, addr, xlat, plen, false);
section = address_space_translate_internal(cpu->memory_dispatch,
addr, xlat, plen, false);
assert(!section->mr->iommu_ops);
return section;
@ -1961,9 +1962,11 @@ static uint16_t dummy_section(PhysPageMap *map, AddressSpace *as,
return phys_section_add(map, &section);
}
MemoryRegion *iotlb_to_region(AddressSpace *as, hwaddr index)
MemoryRegion *iotlb_to_region(CPUState *cpu, hwaddr index)
{
return as->dispatch->map.sections[index & ~TARGET_PAGE_MASK].mr;
MemoryRegionSection *sections = cpu->memory_dispatch->map.sections;
return sections[index & ~TARGET_PAGE_MASK].mr;
}
static void io_mem_init(void)