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From 035c7c0a1c88284d2628532a70f43c04aa0aba56 Mon Sep 17 00:00:00 2001
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From: John Snow <jsnow@redhat.com>
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Date: Fri, 25 Jan 2019 22:50:02 +0100
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Subject: [PATCH 02/23] exec: small changes to flatview_do_translate
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MIME-Version: 1.0
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Content-Type: text/plain; charset=UTF-8
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Content-Transfer-Encoding: 8bit
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RH-Author: John Snow <jsnow@redhat.com>
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Message-id: <20190125225007.8197-3-jsnow@redhat.com>
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Patchwork-id: 84117
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O-Subject: [RHEL-7.7 qemu-kvm-rhev PATCH v2 2/7] exec: small changes to flatview_do_translate
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Bugzilla: 1597482
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RH-Acked-by: Paolo Bonzini <pbonzini@redhat.com>
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RH-Acked-by: Philippe Mathieu-Daudé <philmd@redhat.com>
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RH-Acked-by: Peter Xu <peterx@redhat.com>
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RH-Acked-by: Stefano Garzarella <sgarzare@redhat.com>
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From: Paolo Bonzini <pbonzini@redhat.com>
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Prepare for extracting the IOMMU part to a separate function. Mostly
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cosmetic; the only semantic change is that, if there is more than one
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cascaded IOMMU and the second one fails to translate, *plen_out is now
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adjusted according to the page mask of the first IOMMU.
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Reviewed-by: Peter Xu <peterx@redhat.com>
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Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
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(cherry picked from commit ad2804d9e47df2dab642a253502b5ceef233f450)
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Signed-off-by: John Snow <jsnow@redhat.com>
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Signed-off-by: Miroslav Rezanina <mrezanin@redhat.com>
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---
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exec.c | 33 ++++++++++++++-------------------
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1 file changed, 14 insertions(+), 19 deletions(-)
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diff --git a/exec.c b/exec.c
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index 9028700..c6aeded 100644
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--- a/exec.c
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+++ b/exec.c
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@@ -459,6 +459,7 @@ address_space_translate_internal(AddressSpaceDispatch *d, hwaddr addr, hwaddr *x
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* would tell. It can be @NULL if we don't care about it.
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* @is_write: whether the translation operation is for write
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* @is_mmio: whether this can be MMIO, set true if it can
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+ * @target_as: the address space targeted by the IOMMU
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*
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* This function is called from RCU critical section
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*/
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@@ -478,14 +479,14 @@ static MemoryRegionSection flatview_do_translate(FlatView *fv,
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hwaddr page_mask = (hwaddr)(-1);
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hwaddr plen = (hwaddr)(-1);
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- if (plen_out) {
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- plen = *plen_out;
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+ if (!plen_out) {
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+ plen_out = &ple;;
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}
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for (;;) {
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section = address_space_translate_internal(
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- flatview_to_dispatch(fv), addr, &addr,
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- &plen, is_mmio);
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+ flatview_to_dispatch(fv), addr, xlat,
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+ plen_out, is_mmio);
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iommu_mr = memory_region_get_iommu(section->mr);
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if (!iommu_mr) {
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@@ -493,35 +494,29 @@ static MemoryRegionSection flatview_do_translate(FlatView *fv,
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}
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imrc = memory_region_get_iommu_class_nocheck(iommu_mr);
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+ addr = *xlat;
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iotlb = imrc->translate(iommu_mr, addr, is_write ?
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IOMMU_WO : IOMMU_RO);
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- addr = ((iotlb.translated_addr & ~iotlb.addr_mask)
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- | (addr & iotlb.addr_mask));
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- page_mask &= iotlb.addr_mask;
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- plen = MIN(plen, (addr | iotlb.addr_mask) - addr + 1);
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if (!(iotlb.perm & (1 << is_write))) {
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goto translate_fail;
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}
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+ addr = ((iotlb.translated_addr & ~iotlb.addr_mask)
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+ | (addr & iotlb.addr_mask));
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+ page_mask &= iotlb.addr_mask;
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+ *plen_out = MIN(*plen_out, (addr | iotlb.addr_mask) - addr + 1);
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fv = address_space_to_flatview(iotlb.target_as);
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*target_as = iotlb.target_as;
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}
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- *xlat = addr;
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-
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- if (page_mask == (hwaddr)(-1)) {
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- /* Not behind an IOMMU, use default page size. */
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- page_mask = ~TARGET_PAGE_MASK;
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- }
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-
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if (page_mask_out) {
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+ if (page_mask == (hwaddr)(-1)) {
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+ /* Not behind an IOMMU, use default page size. */
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+ page_mask = ~TARGET_PAGE_MASK;
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+ }
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*page_mask_out = page_mask;
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}
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- if (plen_out) {
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- *plen_out = plen;
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- }
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-
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return *section;
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translate_fail:
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--
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1.8.3.1
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