Nicholas A. Bellinger
2013-Apr-03 09:15 UTC
[PATCH] vhost: Add vhost_commit callback for SeaBIOS ROM region re-mapping
From: Nicholas Bellinger <nab at linux-iscsi.org>
This patch follows MST's recommendation to move checks for
vhost_verify_ring_mappings() -> cpu_physical_memory_map() operations
from MemoryListener->region_[add,del]() -> vhost_set_memory() into
final MemoryListener->commit() -> vhost_commit() callback.
It addresses the case where virtio-scsi vq ioport RAM re-mapping
to read-only SeaBIOS ROM triggers a cpu_physical_memory_map()
NIL MemoryRegionSection pointer failure.
Also save vhost_dev->mem_changed_[start,end]_addr values in
vhost_set_memory() for final ranges_overlap checks. (Thanks Paolo!)
Cc: Michael S. Tsirkin <mst at redhat.com>
Cc: Paolo Bonzini <pbonzini at redhat.com>
Cc: Asias He <asias at redhat.com>
Signed-off-by: Nicholas Bellinger <nab at linux-iscsi.org>
---
hw/vhost.c | 53 ++++++++++++++++++++++++++++++++++++++---------------
hw/vhost.h | 3 +++
2 files changed, 41 insertions(+), 15 deletions(-)
diff --git a/hw/vhost.c b/hw/vhost.c
index 832cc89..00345f2 100644
--- a/hw/vhost.c
+++ b/hw/vhost.c
@@ -385,8 +385,6 @@ static void vhost_set_memory(MemoryListener *listener,
bool log_dirty = memory_region_is_logging(section->mr);
int s = offsetof(struct vhost_memory, regions) +
(dev->mem->nregions + 1) * sizeof dev->mem->regions[0];
- uint64_t log_size;
- int r;
void *ram;
dev->mem = g_realloc(dev->mem, s);
@@ -419,12 +417,47 @@ static void vhost_set_memory(MemoryListener *listener,
/* Remove old mapping for this memory, if any. */
vhost_dev_unassign_memory(dev, start_addr, size);
}
+ dev->mem_changed_start_addr = MIN(dev->mem_changed_start_addr,
start_addr);
+ dev->mem_changed_end_addr = MAX(dev->mem_changed_end_addr, start_addr
+ size - 1);
+ dev->memory_changed = true;
+}
+
+static bool vhost_section(MemoryRegionSection *section)
+{
+ return memory_region_is_ram(section->mr);
+}
+
+static void vhost_begin(MemoryListener *listener)
+{
+ struct vhost_dev *dev = container_of(listener, struct vhost_dev,
+ memory_listener);
+ dev->mem_changed_end_addr = 0;
+ dev->mem_changed_start_addr = -1;
+}
+static void vhost_commit(MemoryListener *listener)
+{
+ struct vhost_dev *dev = container_of(listener, struct vhost_dev,
+ memory_listener);
+ hwaddr start_addr = 0;
+ ram_addr_t size = 0;
+ uint64_t log_size;
+ int r;
+
+ if (!dev->memory_changed) {
+ return;
+ }
if (!dev->started) {
return;
}
+ if (dev->mem_changed_start_addr > dev->mem_changed_end_addr) {
+ return;
+ }
if (dev->started) {
+ start_addr = dev->mem_changed_start_addr;
+ size = dev->mem_changed_end_addr - dev->mem_changed_start_addr +
1;
+
r = vhost_verify_ring_mappings(dev, start_addr, size);
assert(r >= 0);
}
@@ -432,6 +465,7 @@ static void vhost_set_memory(MemoryListener *listener,
if (!dev->log_enabled) {
r = ioctl(dev->control, VHOST_SET_MEM_TABLE, dev->mem);
assert(r >= 0);
+ dev->memory_changed = false;
return;
}
log_size = vhost_get_log_size(dev);
@@ -448,19 +482,7 @@ static void vhost_set_memory(MemoryListener *listener,
if (dev->log_size > log_size + VHOST_LOG_BUFFER) {
vhost_dev_log_resize(dev, log_size);
}
-}
-
-static bool vhost_section(MemoryRegionSection *section)
-{
- return memory_region_is_ram(section->mr);
-}
-
-static void vhost_begin(MemoryListener *listener)
-{
-}
-
-static void vhost_commit(MemoryListener *listener)
-{
+ dev->memory_changed = false;
}
static void vhost_region_add(MemoryListener *listener,
@@ -854,6 +876,7 @@ int vhost_dev_init(struct vhost_dev *hdev, int devfd, const
char *devpath,
hdev->log_size = 0;
hdev->log_enabled = false;
hdev->started = false;
+ hdev->memory_changed = false;
memory_listener_register(&hdev->memory_listener,
&address_space_memory);
hdev->force = force;
return 0;
diff --git a/hw/vhost.h b/hw/vhost.h
index f062d48..adb40c3 100644
--- a/hw/vhost.h
+++ b/hw/vhost.h
@@ -45,6 +45,9 @@ struct vhost_dev {
vhost_log_chunk_t *log;
unsigned long long log_size;
bool force;
+ bool memory_changed;
+ hwaddr mem_changed_start_addr;
+ hwaddr mem_changed_end_addr;
};
int vhost_dev_init(struct vhost_dev *hdev, int devfd, const char *devpath,
--
1.7.2.5
Michael S. Tsirkin
2013-Apr-03 09:49 UTC
[PATCH] vhost: Add vhost_commit callback for SeaBIOS ROM region re-mapping
On Wed, Apr 03, 2013 at 09:15:11AM +0000, Nicholas A. Bellinger wrote:> From: Nicholas Bellinger <nab at linux-iscsi.org> > > This patch follows MST's recommendation to move checks for > vhost_verify_ring_mappings() -> cpu_physical_memory_map() operations > from MemoryListener->region_[add,del]() -> vhost_set_memory() into > final MemoryListener->commit() -> vhost_commit() callback. > > It addresses the case where virtio-scsi vq ioport RAM re-mapping > to read-only SeaBIOS ROM triggers a cpu_physical_memory_map() > NIL MemoryRegionSection pointer failure. > > Also save vhost_dev->mem_changed_[start,end]_addr values in > vhost_set_memory() for final ranges_overlap checks. (Thanks Paolo!) > > Cc: Michael S. Tsirkin <mst at redhat.com> > Cc: Paolo Bonzini <pbonzini at redhat.com> > Cc: Asias He <asias at redhat.com> > Signed-off-by: Nicholas Bellinger <nab at linux-iscsi.org>Looks good. Acked-by: Michael S. Tsirkin <mst at redhat.com>> --- > hw/vhost.c | 53 ++++++++++++++++++++++++++++++++++++++--------------- > hw/vhost.h | 3 +++ > 2 files changed, 41 insertions(+), 15 deletions(-) > > diff --git a/hw/vhost.c b/hw/vhost.c > index 832cc89..00345f2 100644 > --- a/hw/vhost.c > +++ b/hw/vhost.c > @@ -385,8 +385,6 @@ static void vhost_set_memory(MemoryListener *listener, > bool log_dirty = memory_region_is_logging(section->mr); > int s = offsetof(struct vhost_memory, regions) + > (dev->mem->nregions + 1) * sizeof dev->mem->regions[0]; > - uint64_t log_size; > - int r; > void *ram; > > dev->mem = g_realloc(dev->mem, s); > @@ -419,12 +417,47 @@ static void vhost_set_memory(MemoryListener *listener, > /* Remove old mapping for this memory, if any. */ > vhost_dev_unassign_memory(dev, start_addr, size); > } > + dev->mem_changed_start_addr = MIN(dev->mem_changed_start_addr, start_addr); > + dev->mem_changed_end_addr = MAX(dev->mem_changed_end_addr, start_addr + size - 1); > + dev->memory_changed = true; > +} > + > +static bool vhost_section(MemoryRegionSection *section) > +{ > + return memory_region_is_ram(section->mr); > +} > + > +static void vhost_begin(MemoryListener *listener) > +{ > + struct vhost_dev *dev = container_of(listener, struct vhost_dev, > + memory_listener); > + dev->mem_changed_end_addr = 0; > + dev->mem_changed_start_addr = -1; > +} > > +static void vhost_commit(MemoryListener *listener) > +{ > + struct vhost_dev *dev = container_of(listener, struct vhost_dev, > + memory_listener); > + hwaddr start_addr = 0; > + ram_addr_t size = 0; > + uint64_t log_size; > + int r; > + > + if (!dev->memory_changed) { > + return; > + } > if (!dev->started) { > return; > } > + if (dev->mem_changed_start_addr > dev->mem_changed_end_addr) { > + return; > + } > > if (dev->started) { > + start_addr = dev->mem_changed_start_addr; > + size = dev->mem_changed_end_addr - dev->mem_changed_start_addr + 1; > + > r = vhost_verify_ring_mappings(dev, start_addr, size); > assert(r >= 0); > } > @@ -432,6 +465,7 @@ static void vhost_set_memory(MemoryListener *listener, > if (!dev->log_enabled) { > r = ioctl(dev->control, VHOST_SET_MEM_TABLE, dev->mem); > assert(r >= 0); > + dev->memory_changed = false; > return; > } > log_size = vhost_get_log_size(dev); > @@ -448,19 +482,7 @@ static void vhost_set_memory(MemoryListener *listener, > if (dev->log_size > log_size + VHOST_LOG_BUFFER) { > vhost_dev_log_resize(dev, log_size); > } > -} > - > -static bool vhost_section(MemoryRegionSection *section) > -{ > - return memory_region_is_ram(section->mr); > -} > - > -static void vhost_begin(MemoryListener *listener) > -{ > -} > - > -static void vhost_commit(MemoryListener *listener) > -{ > + dev->memory_changed = false; > } > > static void vhost_region_add(MemoryListener *listener, > @@ -854,6 +876,7 @@ int vhost_dev_init(struct vhost_dev *hdev, int devfd, const char *devpath, > hdev->log_size = 0; > hdev->log_enabled = false; > hdev->started = false; > + hdev->memory_changed = false; > memory_listener_register(&hdev->memory_listener, &address_space_memory); > hdev->force = force; > return 0; > diff --git a/hw/vhost.h b/hw/vhost.h > index f062d48..adb40c3 100644 > --- a/hw/vhost.h > +++ b/hw/vhost.h > @@ -45,6 +45,9 @@ struct vhost_dev { > vhost_log_chunk_t *log; > unsigned long long log_size; > bool force; > + bool memory_changed; > + hwaddr mem_changed_start_addr; > + hwaddr mem_changed_end_addr; > }; > > int vhost_dev_init(struct vhost_dev *hdev, int devfd, const char *devpath, > -- > 1.7.2.5
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