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[Qemu-devel] [RFC PATCH 1/8] memory: add ref/unref calls
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From: |
Paolo Bonzini |
|
Subject: |
[Qemu-devel] [RFC PATCH 1/8] memory: add ref/unref calls |
|
Date: |
Mon, 6 May 2013 16:25:14 +0200 |
Add ref/unref calls at the following places:
- places where memory regions are stashed by a listener and
used outside the BQL (including in Xen or KVM).
- memory_region_find callsites
Signed-off-by: Paolo Bonzini <address@hidden>
---
exec.c | 6 +++++-
hw/core/loader.c | 1 +
hw/display/exynos4210_fimd.c | 6 ++++++
hw/display/framebuffer.c | 10 ++++++----
hw/i386/kvm/ioapic.c | 2 ++
hw/i386/kvmvapic.c | 1 +
hw/misc/vfio.c | 2 ++
hw/virtio/dataplane/hostmem.c | 7 +++++++
hw/virtio/vhost.c | 2 ++
hw/virtio/virtio-balloon.c | 1 +
hw/xen/xen_pt.c | 4 ++++
include/exec/memory.h | 9 +++++++++
include/hw/virtio/dataplane/hostmem.h | 1 +
kvm-all.c | 2 ++
memory.c | 16 ++++++++++++++++
target-arm/kvm.c | 2 ++
target-sparc/mmu_helper.c | 1 +
xen-all.c | 2 ++
18 files changed, 70 insertions(+), 5 deletions(-)
diff --git a/exec.c b/exec.c
index 91cd28f..9f324bb 100644
--- a/exec.c
+++ b/exec.c
@@ -753,12 +753,16 @@ static uint16_t phys_section_add(MemoryRegionSection
*section)
phys_sections_nb_alloc);
}
phys_sections[phys_sections_nb] = *section;
+ memory_region_ref(section->mr);
return phys_sections_nb++;
}
static void phys_sections_clear(void)
{
- phys_sections_nb = 0;
+ while (phys_sections_nb > 0) {
+ MemoryRegionSection *section = &phys_sections[--phys_sections_nb];
+ memory_region_unref(section->mr);
+ }
}
static void register_subpage(AddressSpaceDispatch *d, MemoryRegionSection
*section)
diff --git a/hw/core/loader.c b/hw/core/loader.c
index 7507914..97e7ba2 100644
--- a/hw/core/loader.c
+++ b/hw/core/loader.c
@@ -727,6 +727,7 @@ int rom_load_all(void)
addr += rom->romsize;
section = memory_region_find(get_system_memory(), rom->addr, 1);
rom->isrom = section.size && memory_region_is_rom(section.mr);
+ memory_region_unref(section.mr);
}
qemu_register_reset(rom_reset, NULL);
roms_loaded = 1;
diff --git a/hw/display/exynos4210_fimd.c b/hw/display/exynos4210_fimd.c
index 6cb5016..afa2e54 100644
--- a/hw/display/exynos4210_fimd.c
+++ b/hw/display/exynos4210_fimd.c
@@ -1126,6 +1126,11 @@ static void
fimd_update_memory_section(Exynos4210fimdState *s, unsigned win)
/* Total number of bytes of virtual screen used by current window */
w->fb_len = fb_mapped_len = (w->virtpage_width + w->virtpage_offsize) *
(w->rightbot_y - w->lefttop_y + 1);
+
+ /* TODO: add .exit and unref the region there. Not needed yet since sysbus
+ * does not support hot-unplug.
+ */
+ memory_region_unref(w->mem_section.mr);
w->mem_section = memory_region_find(sysbus_address_space(&s->busdev),
fb_start_addr, w->fb_len);
assert(w->mem_section.mr);
@@ -1154,6 +1159,7 @@ static void
fimd_update_memory_section(Exynos4210fimdState *s, unsigned win)
return;
error_return:
+ memory_region_unref(w->mem_section.mr);
w->mem_section.mr = NULL;
w->mem_section.size = 0;
w->host_fb_addr = NULL;
diff --git a/hw/display/framebuffer.c b/hw/display/framebuffer.c
index 6be31db..8288b93 100644
--- a/hw/display/framebuffer.c
+++ b/hw/display/framebuffer.c
@@ -54,10 +54,10 @@ void framebuffer_update_display(
src_len = src_width * rows;
mem_section = memory_region_find(address_space, base, src_len);
+ mem = mem_section.mr;
if (mem_section.size != src_len || !memory_region_is_ram(mem_section.mr)) {
- return;
+ goto out;
}
- mem = mem_section.mr;
assert(mem);
assert(mem_section.offset_within_address_space == base);
@@ -67,10 +67,10 @@ void framebuffer_update_display(
but it's not really worth it as dirty flag tracking will probably
already have failed above. */
if (!src_base)
- return;
+ goto out;
if (src_len != src_width * rows) {
cpu_physical_memory_unmap(src_base, src_len, 0, 0);
- return;
+ goto out;
}
src = src_base;
dest = surface_data(ds);
@@ -107,4 +107,6 @@ void framebuffer_update_display(
DIRTY_MEMORY_VGA);
*first_row = first;
*last_row = last;
+out:
+ memory_region_unref(mem);
}
diff --git a/hw/i386/kvm/ioapic.c b/hw/i386/kvm/ioapic.c
index 3ad951e..9192b39 100644
--- a/hw/i386/kvm/ioapic.c
+++ b/hw/i386/kvm/ioapic.c
@@ -114,6 +114,8 @@ static void kvm_ioapic_put(IOAPICCommonState *s)
fprintf(stderr, "KVM_GET_IRQCHIP failed: %s\n", strerror(ret));
abort();
}
+
+ memory_region_unref(mrs.mr);
}
static void kvm_ioapic_reset(DeviceState *dev)
diff --git a/hw/i386/kvmvapic.c b/hw/i386/kvmvapic.c
index 5b558aa..6a98c7f 100644
--- a/hw/i386/kvmvapic.c
+++ b/hw/i386/kvmvapic.c
@@ -605,6 +605,7 @@ static void vapic_map_rom_writable(VAPICROMState *s)
rom_size);
memory_region_add_subregion_overlap(as, rom_paddr, &s->rom, 1000);
s->rom_mapped_writable = true;
+ memory_region_unref(section.mr);
}
static int vapic_prepare(VAPICROMState *s)
diff --git a/hw/misc/vfio.c b/hw/misc/vfio.c
index 178dd11..0ae6878 100644
--- a/hw/misc/vfio.c
+++ b/hw/misc/vfio.c
@@ -1969,6 +1969,7 @@ static void vfio_listener_region_add(MemoryListener
*listener,
DPRINTF("region_add %"HWADDR_PRIx" - %"HWADDR_PRIx" [%p]\n",
iova, end - 1, vaddr);
+ memory_region_ref(section->mr);
ret = vfio_dma_map(container, iova, end - iova, vaddr, section->readonly);
if (ret) {
error_report("vfio_dma_map(%p, 0x%"HWADDR_PRIx", "
@@ -2010,6 +2011,7 @@ static void vfio_listener_region_del(MemoryListener
*listener,
iova, end - 1);
ret = vfio_dma_unmap(container, iova, end - iova);
+ memory_region_unref(section->mr);
if (ret) {
error_report("vfio_dma_unmap(%p, 0x%"HWADDR_PRIx", "
"0x%"HWADDR_PRIx") = %d (%m)",
diff --git a/hw/virtio/dataplane/hostmem.c b/hw/virtio/dataplane/hostmem.c
index 37292ff..66829bb 100644
--- a/hw/virtio/dataplane/hostmem.c
+++ b/hw/virtio/dataplane/hostmem.c
@@ -64,8 +64,12 @@ out:
static void hostmem_listener_commit(MemoryListener *listener)
{
HostMem *hostmem = container_of(listener, HostMem, listener);
+ int i;
qemu_mutex_lock(&hostmem->current_regions_lock);
+ for (i = 0; i < hostmem->num_current_regions; i++) {
+ memory_region_unref(hostmem->current_regions[i].mr);
+ }
g_free(hostmem->current_regions);
hostmem->current_regions = hostmem->new_regions;
hostmem->num_current_regions = hostmem->num_new_regions;
@@ -92,8 +96,11 @@ static void hostmem_append_new_region(HostMem *hostmem,
.guest_addr = section->offset_within_address_space,
.size = section->size,
.readonly = section->readonly,
+ .mr = section->mr,
};
hostmem->num_new_regions++;
+
+ memory_region_ref(section->mr);
}
static void hostmem_listener_append_region(MemoryListener *listener,
diff --git a/hw/virtio/vhost.c b/hw/virtio/vhost.c
index fbabf99..190522b 100644
--- a/hw/virtio/vhost.c
+++ b/hw/virtio/vhost.c
@@ -497,6 +497,7 @@ static void vhost_region_add(MemoryListener *listener,
dev->mem_sections = g_renew(MemoryRegionSection, dev->mem_sections,
dev->n_mem_sections);
dev->mem_sections[dev->n_mem_sections - 1] = *section;
+ memory_region_ref(section->mr);
vhost_set_memory(listener, section, true);
}
@@ -512,6 +513,7 @@ static void vhost_region_del(MemoryListener *listener,
}
vhost_set_memory(listener, section, false);
+ memory_region_unref(section->mr);
for (i = 0; i < dev->n_mem_sections; ++i) {
if (dev->mem_sections[i].offset_within_address_space
== section->offset_within_address_space) {
diff --git a/hw/virtio/virtio-balloon.c b/hw/virtio/virtio-balloon.c
index d669756..fac8800 100644
--- a/hw/virtio/virtio-balloon.c
+++ b/hw/virtio/virtio-balloon.c
@@ -205,6 +205,7 @@ static void virtio_balloon_handle_output(VirtIODevice
*vdev, VirtQueue *vq)
addr = section.offset_within_region;
balloon_page(memory_region_get_ram_ptr(section.mr) + addr,
!!(vq == s->dvq));
+ memory_region_unref(section.mr);
}
virtqueue_push(vq, &elem, offset);
diff --git a/hw/xen/xen_pt.c b/hw/xen/xen_pt.c
index c199818..be1fd52 100644
--- a/hw/xen/xen_pt.c
+++ b/hw/xen/xen_pt.c
@@ -606,6 +606,7 @@ static void xen_pt_region_add(MemoryListener *l,
MemoryRegionSection *sec)
XenPCIPassthroughState *s = container_of(l, XenPCIPassthroughState,
memory_listener);
+ memory_region_ref(sec->mr);
xen_pt_region_update(s, sec, true);
}
@@ -615,6 +616,7 @@ static void xen_pt_region_del(MemoryListener *l,
MemoryRegionSection *sec)
memory_listener);
xen_pt_region_update(s, sec, false);
+ memory_region_unref(sec->mr);
}
static void xen_pt_io_region_add(MemoryListener *l, MemoryRegionSection *sec)
@@ -622,6 +624,7 @@ static void xen_pt_io_region_add(MemoryListener *l,
MemoryRegionSection *sec)
XenPCIPassthroughState *s = container_of(l, XenPCIPassthroughState,
io_listener);
+ memory_region_ref(sec->mr);
xen_pt_region_update(s, sec, true);
}
@@ -631,6 +634,7 @@ static void xen_pt_io_region_del(MemoryListener *l,
MemoryRegionSection *sec)
io_listener);
xen_pt_region_update(s, sec, false);
+ memory_region_unref(sec->mr);
}
static const MemoryListener xen_pt_memory_listener = {
diff --git a/include/exec/memory.h b/include/exec/memory.h
index d2bbfb7..fb1b42f 100644
--- a/include/exec/memory.h
+++ b/include/exec/memory.h
@@ -252,6 +252,15 @@ struct MemoryListener {
void memory_region_init(MemoryRegion *mr,
const char *name,
uint64_t size);
+
+static inline void memory_region_ref(MemoryRegion *mr)
+{
+}
+
+static inline void memory_region_unref(MemoryRegion *mr)
+{
+}
+
/**
* memory_region_init_io: Initialize an I/O memory region.
*
diff --git a/include/hw/virtio/dataplane/hostmem.h
b/include/hw/virtio/dataplane/hostmem.h
index b2cf093..2810f4b 100644
--- a/include/hw/virtio/dataplane/hostmem.h
+++ b/include/hw/virtio/dataplane/hostmem.h
@@ -18,6 +18,7 @@
#include "qemu/thread.h"
typedef struct {
+ MemoryRegion *mr;
void *host_addr;
hwaddr guest_addr;
uint64_t size;
diff --git a/kvm-all.c b/kvm-all.c
index 3a31602..1d876aa 100644
--- a/kvm-all.c
+++ b/kvm-all.c
@@ -766,6 +766,7 @@ static void kvm_set_phys_mem(MemoryRegionSection *section,
bool add)
static void kvm_region_add(MemoryListener *listener,
MemoryRegionSection *section)
{
+ memory_region_ref(section->mr);
kvm_set_phys_mem(section, true);
}
@@ -773,6 +774,7 @@ static void kvm_region_del(MemoryListener *listener,
MemoryRegionSection *section)
{
kvm_set_phys_mem(section, false);
+ memory_region_unref(section->mr);
}
static void kvm_log_sync(MemoryListener *listener,
diff --git a/memory.c b/memory.c
index aa0eeb7..bc4cf4b 100644
--- a/memory.c
+++ b/memory.c
@@ -145,6 +145,7 @@ static bool memory_listener_match(MemoryListener *listener,
} \
} while (0)
+/* No need to ref/unref .mr, the FlatRange keeps it alive. */
#define MEMORY_LISTENER_UPDATE_REGION(fr, as, dir, callback) \
MEMORY_LISTENER_CALL(callback, dir, (&(MemoryRegionSection) { \
.mr = (fr)->mr, \
@@ -260,11 +261,17 @@ static void flatview_insert(FlatView *view, unsigned pos,
FlatRange *range)
memmove(view->ranges + pos + 1, view->ranges + pos,
(view->nr - pos) * sizeof(FlatRange));
view->ranges[pos] = *range;
+ memory_region_ref(range->mr);
++view->nr;
}
static void flatview_destroy(FlatView *view)
{
+ int i;
+
+ for (i = 0; i < view->nr; i++) {
+ memory_region_unref(view->ranges[i].mr);
+ }
g_free(view->ranges);
}
@@ -763,6 +770,11 @@ static void memory_region_destructor_ram(MemoryRegion *mr)
qemu_ram_free(mr->ram_addr);
}
+static void memory_region_destructor_alias(MemoryRegion *mr)
+{
+ memory_region_unref(mr->alias);
+}
+
static void memory_region_destructor_ram_from_ptr(MemoryRegion *mr)
{
qemu_ram_free_from_ptr(mr->ram_addr);
@@ -960,6 +972,8 @@ void memory_region_init_alias(MemoryRegion *mr,
uint64_t size)
{
memory_region_init(mr, name, size);
+ memory_region_ref(orig);
+ mr->destructor = memory_region_destructor_alias;
mr->alias = orig;
mr->alias_offset = offset;
}
@@ -1504,6 +1518,8 @@ MemoryRegionSection memory_region_find(MemoryRegion *mr,
ret.size = int128_get64(range.size);
ret.offset_within_address_space = int128_get64(range.start);
ret.readonly = fr->readonly;
+ memory_region_ref(ret.mr);
+
return ret;
}
diff --git a/target-arm/kvm.c b/target-arm/kvm.c
index b7bdc03..b9051a4 100644
--- a/target-arm/kvm.c
+++ b/target-arm/kvm.c
@@ -127,6 +127,7 @@ static void kvm_arm_machine_init_done(Notifier *notifier,
void *data)
abort();
}
}
+ memory_region_unref(kd->mr);
g_free(kd);
}
}
@@ -152,6 +153,7 @@ void kvm_arm_register_device(MemoryRegion *mr, uint64_t
devid)
kd->kda.id = devid;
kd->kda.addr = -1;
QSLIST_INSERT_HEAD(&kvm_devices_head, kd, entries);
+ memory_region_ref(kd->mr);
}
typedef struct Reg {
diff --git a/target-sparc/mmu_helper.c b/target-sparc/mmu_helper.c
index a9649ae..3c1ccc2 100644
--- a/target-sparc/mmu_helper.c
+++ b/target-sparc/mmu_helper.c
@@ -845,6 +845,7 @@ hwaddr cpu_get_phys_page_debug(CPUSPARCState *env,
target_ulong addr)
}
}
section = memory_region_find(get_system_memory(), phys_addr, 1);
+ memory_region_unref(section.mr);
if (!section.size) {
return -1;
}
diff --git a/xen-all.c b/xen-all.c
index 539a154..2f24ced 100644
--- a/xen-all.c
+++ b/xen-all.c
@@ -459,6 +459,7 @@ static void xen_set_memory(struct MemoryListener *listener,
static void xen_region_add(MemoryListener *listener,
MemoryRegionSection *section)
{
+ memory_region_ref(section->mr);
xen_set_memory(listener, section, true);
}
@@ -466,6 +467,7 @@ static void xen_region_del(MemoryListener *listener,
MemoryRegionSection *section)
{
xen_set_memory(listener, section, false);
+ memory_region_unref(section->mr);
}
static void xen_sync_dirty_bitmap(XenIOState *state,
--
1.7.1
- [Qemu-devel] [RFC PATCH 0/8] MemoryRegion and FlatView refcounting, replace hostmem with memory_region_find, Paolo Bonzini, 2013/05/06
- [Qemu-devel] [RFC PATCH 2/8] exec: check MRU in qemu_ram_addr_from_host, Paolo Bonzini, 2013/05/06
- [Qemu-devel] [RFC PATCH 1/8] memory: add ref/unref calls,
Paolo Bonzini <=
- [Qemu-devel] [RFC PATCH 4/8] memory: ref/unref memory across address_space_map/unmap, Paolo Bonzini, 2013/05/06
- [Qemu-devel] [RFC PATCH 3/8] memory: return MemoryRegion from qemu_ram_addr_from_host, Paolo Bonzini, 2013/05/06
- [Qemu-devel] [RFC PATCH 5/8] memory: access FlatView from a local variable, Paolo Bonzini, 2013/05/06
- [Qemu-devel] [RFC PATCH 6/8] memory: use a new FlatView pointer on every topology update, Paolo Bonzini, 2013/05/06
- [Qemu-devel] [RFC PATCH 7/8] memory: add reference counting to FlatView, Paolo Bonzini, 2013/05/06
- [Qemu-devel] [RFC PATCH 8/8] dataplane: replace hostmem with memory_region_find, Paolo Bonzini, 2013/05/06
- Re: [Qemu-devel] [RFC PATCH 0/8] MemoryRegion and FlatView refcounting, replace hostmem with memory_region_find, liu ping fan, 2013/05/08