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exec: small changes to flatview_do_translate 

Prepare for extracting the IOMMU part to a separate function.  Mostly
cosmetic; the only semantic change is that, if there is more than one
cascaded IOMMU and the second one fails to translate, *plen_out is now
adjusted according to the page mask of the first IOMMU.

Reviewed-by: Peter Xu <peterx@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Paolo Bonzini 2018-04-17 11:39:35 +02:00
parent 4269c82bf7
commit ad2804d9e4
1 changed files with 14 additions and 19 deletions
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33
exec.c
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@ -476,6 +476,7 @@ address_space_translate_internal(AddressSpaceDispatch *d, hwaddr addr, hwaddr *x
* would tell. It can be @NULL if we don't care about it.
* @is_write: whether the translation operation is for write
* @is_mmio: whether this can be MMIO, set true if it can
* @target_as: the address space targeted by the IOMMU
*
* This function is called from RCU critical section
*/
@ -495,14 +496,14 @@ static MemoryRegionSection flatview_do_translate(FlatView *fv,
hwaddr page_mask = (hwaddr)(-1);
hwaddr plen = (hwaddr)(-1);
if (plen_out) {
plen = *plen_out;
if (!plen_out) {
plen_out = &plen;
}
for (;;) {
section = address_space_translate_internal(
flatview_to_dispatch(fv), addr, &addr,
&plen, is_mmio);
flatview_to_dispatch(fv), addr, xlat,
plen_out, is_mmio);
iommu_mr = memory_region_get_iommu(section->mr);
if (!iommu_mr) {
@ -510,35 +511,29 @@ static MemoryRegionSection flatview_do_translate(FlatView *fv,
}
imrc = memory_region_get_iommu_class_nocheck(iommu_mr);
addr = *xlat;
iotlb = imrc->translate(iommu_mr, addr, is_write ?
IOMMU_WO : IOMMU_RO);
addr = ((iotlb.translated_addr & ~iotlb.addr_mask)
| (addr & iotlb.addr_mask));
page_mask &= iotlb.addr_mask;
plen = MIN(plen, (addr | iotlb.addr_mask) - addr + 1);
if (!(iotlb.perm & (1 << is_write))) {
goto translate_fail;
}
addr = ((iotlb.translated_addr & ~iotlb.addr_mask)
| (addr & iotlb.addr_mask));
page_mask &= iotlb.addr_mask;
*plen_out = MIN(*plen_out, (addr | iotlb.addr_mask) - addr + 1);
fv = address_space_to_flatview(iotlb.target_as);
*target_as = iotlb.target_as;
}
*xlat = addr;
if (page_mask == (hwaddr)(-1)) {
/* Not behind an IOMMU, use default page size. */
page_mask = ~TARGET_PAGE_MASK;
}
if (page_mask_out) {
if (page_mask == (hwaddr)(-1)) {
/* Not behind an IOMMU, use default page size. */
page_mask = ~TARGET_PAGE_MASK;
}
*page_mask_out = page_mask;
}
if (plen_out) {
*plen_out = plen;
}
return *section;
translate_fail: