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exec: Resolve subpages in one step except for IOTLB fills

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Except for the case of setting the IOTLB entry in TCG mode, we can avoid
the subpage dispatching handlers and do the resolution directly on
address_space_lookup_region. An IOTLB entry describes a full page, not
only the region that the first access to a sub-divided page may return.

This patch therefore introduces a special translation function,
address_space_translate_for_iotlb, that avoids the subpage resolutions.
In contrast, callers of the existing address_space_translate service
will now always receive the terminal memory region section. This will be
important for breaking the BQL and for enabling unaligned memory region.

Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Jan Kiszka 2013-05-26 21:46:51 +02:00 • committed by Paolo Bonzini
parent f52cc46742
commit 90260c6c09
3 changed files with 42 additions and 15 deletions
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4
cputlb.c
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@ -256,8 +256,8 @@ void tlb_set_page(CPUArchState *env, target_ulong vaddr,
}
sz = size;
section = address_space_translate(&address_space_memory, paddr, &xlat, &sz,
false);
section = address_space_translate_for_iotlb(&address_space_memory, paddr,
&xlat, &sz);
assert(sz >= TARGET_PAGE_SIZE);
#if defined(DEBUG_TLB)