The e1000 driver calls memory_region_add_coalescing but
kvm_coalesce_mmio_region never been called for those regions.
Update coalesced_range on memory_region_transaction_commit to fix this.
It seems very old bug since memory region API
was merged on commit 093bc2cd885e ("Hierarchical memory region API").
Signed-off-by: Atsushi Nemoto <atsushi.nemoto@sord.co.jp>
---
memory.c | 7 +++++--
1 file changed, 5 insertions(+), 2 deletions(-)
diff --git a/memory.c b/memory.c
index d14c6dec1d..f773b0be50 100644
--- a/memory.c
+++ b/memory.c
@@ -1021,6 +1021,8 @@ void memory_region_transaction_begin(void)
++memory_region_transaction_depth;
}
+static void memory_region_update_coalesced_range_as(MemoryRegion *mr, AddressSpace *as);
+
void memory_region_transaction_commit(void)
{
AddressSpace *as;
@@ -1038,6 +1040,7 @@ void memory_region_transaction_commit(void)
QTAILQ_FOREACH(as, &address_spaces, address_spaces_link) {
address_space_set_flatview(as);
address_space_update_ioeventfds(as);
+ memory_region_update_coalesced_range_as(NULL, as);
}
memory_region_update_pending = false;
ioeventfd_update_pending = false;
@@ -2142,7 +2145,7 @@ static void memory_region_update_coalesced_range_as(MemoryRegion *mr, AddressSpa
view = address_space_get_flatview(as);
FOR_EACH_FLAT_RANGE(fr, view) {
- if (fr->mr == mr) {
+ if (fr->mr == mr || (!mr && !QTAILQ_EMPTY(&fr->mr->coalesced))) {
section = (MemoryRegionSection) {
.fv = view,
.offset_within_address_space = int128_get64(fr->addr.start),
@@ -2152,7 +2155,7 @@ static void memory_region_update_coalesced_range_as(MemoryRegion *mr, AddressSpa
MEMORY_LISTENER_CALL(as, coalesced_io_del, Reverse, §ion,
int128_get64(fr->addr.start),
int128_get64(fr->addr.size));
- QTAILQ_FOREACH(cmr, &mr->coalesced, link) {
+ QTAILQ_FOREACH(cmr, &fr->mr->coalesced, link) {
tmp = addrrange_shift(cmr->addr,
int128_sub(fr->addr.start,
int128_make64(fr->offset_in_region)));
--
2.11.0
On 28/11/18 10:17, Atsushi Nemoto wrote: > The e1000 driver calls memory_region_add_coalescing but > kvm_coalesce_mmio_region never been called for those regions. > > Update coalesced_range on memory_region_transaction_commit to fix this. > > It seems very old bug since memory region API > was merged on commit 093bc2cd885e ("Hierarchical memory region API"). > > Signed-off-by: Atsushi Nemoto <atsushi.nemoto@sord.co.jp> I attach the patch I came up with. What do you think? Thanks, Paolo > memory.c | 7 +++++-- > 1 file changed, 5 insertions(+), 2 deletions(-) > > diff --git a/memory.c b/memory.c > index d14c6dec1d..f773b0be50 100644 > --- a/memory.c > +++ b/memory.c > @@ -1021,6 +1021,8 @@ void memory_region_transaction_begin(void) > ++memory_region_transaction_depth; > } > > +static void memory_region_update_coalesced_range_as(MemoryRegion *mr, AddressSpace *as); > + > void memory_region_transaction_commit(void) > { > AddressSpace *as; > @@ -1038,6 +1040,7 @@ void memory_region_transaction_commit(void) > QTAILQ_FOREACH(as, &address_spaces, address_spaces_link) { > address_space_set_flatview(as); > address_space_update_ioeventfds(as); > + memory_region_update_coalesced_range_as(NULL, as); > } > memory_region_update_pending = false; > ioeventfd_update_pending = false; > @@ -2142,7 +2145,7 @@ static void memory_region_update_coalesced_range_as(MemoryRegion *mr, AddressSpa > > view = address_space_get_flatview(as); > FOR_EACH_FLAT_RANGE(fr, view) { > - if (fr->mr == mr) { > + if (fr->mr == mr || (!mr && !QTAILQ_EMPTY(&fr->mr->coalesced))) { > section = (MemoryRegionSection) { > .fv = view, > .offset_within_address_space = int128_get64(fr->addr.start), > @@ -2152,7 +2155,7 @@ static void memory_region_update_coalesced_range_as(MemoryRegion *mr, AddressSpa > MEMORY_LISTENER_CALL(as, coalesced_io_del, Reverse, §ion, > int128_get64(fr->addr.start), > int128_get64(fr->addr.size)); > - QTAILQ_FOREACH(cmr, &mr->coalesced, link) { > + QTAILQ_FOREACH(cmr, &fr->mr->coalesced, link) { > tmp = addrrange_shift(cmr->addr, > int128_sub(fr->addr.start, > int128_make64(fr->offset_in_region))); >
On Wed, 28 Nov 2018 17:30:59 +0100, Paolo Bonzini <pbonzini@redhat.com> wrote: >> The e1000 driver calls memory_region_add_coalescing but >> kvm_coalesce_mmio_region never been called for those regions. >> >> Update coalesced_range on memory_region_transaction_commit to fix this. >> >> It seems very old bug since memory region API >> was merged on commit 093bc2cd885e ("Hierarchical memory region API"). >> >> Signed-off-by: Atsushi Nemoto <atsushi.nemoto@sord.co.jp> > > I attach the patch I came up with. What do you think? Thank you for the alternative fix. It works well and looks good to me. --- Atsushi Nemoto
On 28/11/18 10:17, Atsushi Nemoto wrote: > The e1000 driver calls memory_region_add_coalescing but > kvm_coalesce_mmio_region never been called for those regions. > > Update coalesced_range on memory_region_transaction_commit to fix this. > > It seems very old bug since memory region API > was merged on commit 093bc2cd885e ("Hierarchical memory region API"). > > Signed-off-by: Atsushi Nemoto <atsushi.nemoto@sord.co.jp> > --- > memory.c | 7 +++++-- > 1 file changed, 5 insertions(+), 2 deletions(-) > > diff --git a/memory.c b/memory.c > index d14c6dec1d..f773b0be50 100644 > --- a/memory.c > +++ b/memory.c > @@ -1021,6 +1021,8 @@ void memory_region_transaction_begin(void) > ++memory_region_transaction_depth; > } > > +static void memory_region_update_coalesced_range_as(MemoryRegion *mr, AddressSpace *as); > + > void memory_region_transaction_commit(void) > { > AddressSpace *as; > @@ -1038,6 +1040,7 @@ void memory_region_transaction_commit(void) > QTAILQ_FOREACH(as, &address_spaces, address_spaces_link) { > address_space_set_flatview(as); > address_space_update_ioeventfds(as); > + memory_region_update_coalesced_range_as(NULL, as); > } > memory_region_update_pending = false; > ioeventfd_update_pending = false; > @@ -2142,7 +2145,7 @@ static void memory_region_update_coalesced_range_as(MemoryRegion *mr, AddressSpa > > view = address_space_get_flatview(as); > FOR_EACH_FLAT_RANGE(fr, view) { > - if (fr->mr == mr) { > + if (fr->mr == mr || (!mr && !QTAILQ_EMPTY(&fr->mr->coalesced))) { > section = (MemoryRegionSection) { > .fv = view, > .offset_within_address_space = int128_get64(fr->addr.start), I'm worried that coalesced_io_del would be skipped when the region is deleted. I think the right place to add the coalesced_io_{add,del} calls is address_space_update_topology_pass. Let me test an alternative fix and post it; thanks for the report in the meanwhile! Paolo > @@ -2152,7 +2155,7 @@ static void memory_region_update_coalesced_range_as(MemoryRegion *mr, AddressSpa > MEMORY_LISTENER_CALL(as, coalesced_io_del, Reverse, §ion, > int128_get64(fr->addr.start), > int128_get64(fr->addr.size)); > - QTAILQ_FOREACH(cmr, &mr->coalesced, link) { > + QTAILQ_FOREACH(cmr, &fr->mr->coalesced, link) { > tmp = addrrange_shift(cmr->addr, > int128_sub(fr->addr.start, > int128_make64(fr->offset_in_region))); >
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