Patchwork [v2,1/2] Minimal RAM API support

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Submitter Alex Williamson
Date Nov. 1, 2010, 3:14 p.m.
Message ID <20101101151330.3927.32277.stgit@s20.home>
Download mbox | patch
Permalink /patch/69811/
State New
Headers show

Comments

Alex Williamson - Nov. 1, 2010, 3:14 p.m.
This adds a minimum chunk of Anthony's RAM API support so that we
can identify actual VM RAM versus all the other things that make
use of qemu_ram_alloc.

Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
---

 Makefile.objs |    1 +
 cpu-common.h  |    2 +
 memory.c      |  109 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 memory.h      |   18 +++++++++
 4 files changed, 130 insertions(+), 0 deletions(-)
 create mode 100644 memory.c
 create mode 100644 memory.h
Anthony Liguori - Nov. 16, 2010, 2:55 p.m.
On 11/01/2010 10:14 AM, Alex Williamson wrote:
> This adds a minimum chunk of Anthony's RAM API support so that we
> can identify actual VM RAM versus all the other things that make
> use of qemu_ram_alloc.
>
> Signed-off-by: Alex Williamson<alex.williamson@redhat.com>
> ---
>
>   Makefile.objs |    1 +
>   cpu-common.h  |    2 +
>   memory.c      |  109 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++
>   memory.h      |   18 +++++++++
>   4 files changed, 130 insertions(+), 0 deletions(-)
>   create mode 100644 memory.c
>   create mode 100644 memory.h
>
> diff --git a/Makefile.objs b/Makefile.objs
> index f07fb01..33fae0b 100644
> --- a/Makefile.objs
> +++ b/Makefile.objs
> @@ -154,6 +154,7 @@ hw-obj-y += vl.o loader.o
>   hw-obj-y += virtio.o virtio-console.o
>   hw-obj-y += fw_cfg.o pci.o pci_host.o pcie_host.o
>   hw-obj-y += watchdog.o
> +hw-obj-y += memory.o
>   hw-obj-$(CONFIG_ISA_MMIO) += isa_mmio.o
>   hw-obj-$(CONFIG_ECC) += ecc.o
>   hw-obj-$(CONFIG_NAND) += nand.o
> diff --git a/cpu-common.h b/cpu-common.h
> index a543b5d..6aa2738 100644
> --- a/cpu-common.h
> +++ b/cpu-common.h
> @@ -23,6 +23,8 @@
>   /* address in the RAM (different from a physical address) */
>   typedef unsigned long ram_addr_t;
>
> +#include "memory.h"
> +
>   /* memory API */
>
>   typedef void CPUWriteMemoryFunc(void *opaque, target_phys_addr_t addr, uint32_t value);
> diff --git a/memory.c b/memory.c
> new file mode 100644
> index 0000000..2895082
> --- /dev/null
> +++ b/memory.c
> @@ -0,0 +1,109 @@
> +/*
> + * RAM API
> + *
> + *  Copyright Red Hat, Inc. 2010
> + *
> + * Authors:
> + *  Alex Williamson<alex.williamson@redhat.com>
> + *
> + * This library is free software; you can redistribute it and/or
> + * modify it under the terms of the GNU Lesser General Public
> + * License as published by the Free Software Foundation; either
> + * version 2 of the License, or (at your option) any later version.
> + *
> + * This library is distributed in the hope that it will be useful,
> + * but WITHOUT ANY WARRANTY; without even the implied warranty of
> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
> + * Lesser General Public License for more details.
> + *
> + * You should have received a copy of the GNU Lesser General Public
> + * License along with this library; if not, see<http://www.gnu.org/licenses/>.
> + */
> +#include "memory.h"
> +#include "range.h"
> +
> +typedef struct QemuRamSlot {
> +    target_phys_addr_t start_addr;
> +    ram_addr_t size;
> +    ram_addr_t offset;
> +    QLIST_ENTRY(QemuRamSlot) next;
> +} QemuRamSlot;
> +
> +typedef struct QemuRamSlots {
> +    QLIST_HEAD(slots, QemuRamSlot) slots;
> +} QemuRamSlots;
>    

No need for all of the 'Qemu' prefixes.

> +
> +static QemuRamSlots ram_slots = { .slots = QLIST_HEAD_INITIALIZER(ram_slots) };
>    

Might be nicer to just typedef the extra struct away.

> +static QemuRamSlot *qemu_ram_find_slot(target_phys_addr_t start_addr,
> +                                       ram_addr_t size)
> +{
> +    QemuRamSlot *slot;
> +
> +    QLIST_FOREACH(slot,&ram_slots.slots, next) {
> +        if (slot->start_addr == start_addr&&  slot->size == size) {
> +            return slot;
> +        }
> +
> +        if (ranges_overlap(start_addr, size, slot->start_addr, slot->size)) {
> +            abort();
>    

Should display a message before aborting.

> +        }
> +    }
> +
> +    return NULL;
> +}
> +
> +int qemu_ram_register(target_phys_addr_t start_addr, ram_addr_t size,
> +                       ram_addr_t phys_offset)
> +{
> +    QemuRamSlot *slot;
> +
> +    if (!size) {
> +        return -EINVAL;
> +    }
> +
> +    assert(!qemu_ram_find_slot(start_addr, size));
> +
> +    slot = qemu_mallocz(sizeof(QemuRamSlot));
> +
> +    slot->start_addr = start_addr;
> +    slot->size = size;
> +    slot->offset = phys_offset;
> +
> +    QLIST_INSERT_HEAD(&ram_slots.slots, slot, next);
> +
> +    cpu_register_physical_memory(slot->start_addr, slot->size, slot->offset);
> +
> +    return 0;
> +}
> +
> +void qemu_ram_unregister(target_phys_addr_t start_addr, ram_addr_t size)
> +{
> +    QemuRamSlot *slot;
> +
> +    if (!size) {
> +        return;
> +    }
> +
> +    slot = qemu_ram_find_slot(start_addr, size);
> +    assert(slot != NULL);
> +
> +    QLIST_REMOVE(slot, next);
> +    qemu_free(slot);
> +    cpu_register_physical_memory(start_addr, size, IO_MEM_UNASSIGNED);
> +
> +    return;
> +}
> +
> +int qemu_ram_for_each_slot(void *opaque, qemu_ram_for_each_slot_fn fn)
> +{
> +    QemuRamSlot *slot;
> +
> +    QLIST_FOREACH(slot,&ram_slots.slots, next) {
> +        int ret = fn(opaque, slot->start_addr, slot->size, slot->offset);
> +        if (ret) {
> +            return ret;
> +        }
> +    }
> +    return 0;
> +}
> diff --git a/memory.h b/memory.h
> new file mode 100644
> index 0000000..0c17ff9
> --- /dev/null
> +++ b/memory.h
> @@ -0,0 +1,18 @@
> +#ifndef QEMU_MEMORY_H
> +#define QEMU_MEMORY_H
> +
> +#include "qemu-common.h"
> +#include "cpu-common.h"
>    

Header needs copyright and would be nice to have some comments 
explaining these functions.

Regards,

Anthony Liguori

> +int qemu_ram_register(target_phys_addr_t start_addr, ram_addr_t size,
> +                      ram_addr_t phys_offset);
> +
> +void qemu_ram_unregister(target_phys_addr_t start_addr, ram_addr_t size);
> +
> +typedef int (*qemu_ram_for_each_slot_fn)(void *opaque,
> +                                         target_phys_addr_t start_addr,
> +                                         ram_addr_t size,
> +                                         ram_addr_t phys_offset);
> +
> +int qemu_ram_for_each_slot(void *opaque, qemu_ram_for_each_slot_fn fn);
> +#endif
>
>
>
>
Alexander Graf - Nov. 16, 2010, 3:02 p.m.
On 16.11.2010, at 15:55, Anthony Liguori wrote:

> On 11/01/2010 10:14 AM, Alex Williamson wrote:
>> This adds a minimum chunk of Anthony's RAM API support so that we
>> can identify actual VM RAM versus all the other things that make
>> use of qemu_ram_alloc.
>> 
>> Signed-off-by: Alex Williamson<alex.williamson@redhat.com>
>> ---
> 

[...]

> 
>> +static QemuRamSlot *qemu_ram_find_slot(target_phys_addr_t start_addr,
>> +                                       ram_addr_t size)
>> +{
>> +    QemuRamSlot *slot;
>> +
>> +    QLIST_FOREACH(slot,&ram_slots.slots, next) {
>> +        if (slot->start_addr == start_addr&&  slot->size == size) {
>> +            return slot;
>> +        }
>> +
>> +        if (ranges_overlap(start_addr, size, slot->start_addr, slot->size)) {
>> +            abort();
>>   
> 
> Should display a message before aborting.

Why not use hw_error?


Alex
Anthony Liguori - Nov. 16, 2010, 3:08 p.m.
On 11/16/2010 09:02 AM, Alexander Graf wrote:
>>> +static QemuRamSlot *qemu_ram_find_slot(target_phys_addr_t start_addr,
>>> +                                       ram_addr_t size)
>>> +{
>>> +    QemuRamSlot *slot;
>>> +
>>> +    QLIST_FOREACH(slot,&ram_slots.slots, next) {
>>> +        if (slot->start_addr == start_addr&&   slot->size == size) {
>>> +            return slot;
>>> +        }
>>> +
>>> +        if (ranges_overlap(start_addr, size, slot->start_addr, slot->size)) {
>>> +            abort();
>>>
>>>        
>> Should display a message before aborting.
>>      
> Why not use hw_error?
>    

Another good suggestion.

Regards,

Anthony Liguori

> Alex--
> To unsubscribe from this list: send the line "unsubscribe kvm" in
> the body of a message to majordomo@vger.kernel.org
> More majordomo info at  http://vger.kernel.org/majordomo-info.html
>

Patch

diff --git a/Makefile.objs b/Makefile.objs
index f07fb01..33fae0b 100644
--- a/Makefile.objs
+++ b/Makefile.objs
@@ -154,6 +154,7 @@  hw-obj-y += vl.o loader.o
 hw-obj-y += virtio.o virtio-console.o
 hw-obj-y += fw_cfg.o pci.o pci_host.o pcie_host.o
 hw-obj-y += watchdog.o
+hw-obj-y += memory.o
 hw-obj-$(CONFIG_ISA_MMIO) += isa_mmio.o
 hw-obj-$(CONFIG_ECC) += ecc.o
 hw-obj-$(CONFIG_NAND) += nand.o
diff --git a/cpu-common.h b/cpu-common.h
index a543b5d..6aa2738 100644
--- a/cpu-common.h
+++ b/cpu-common.h
@@ -23,6 +23,8 @@ 
 /* address in the RAM (different from a physical address) */
 typedef unsigned long ram_addr_t;
 
+#include "memory.h"
+
 /* memory API */
 
 typedef void CPUWriteMemoryFunc(void *opaque, target_phys_addr_t addr, uint32_t value);
diff --git a/memory.c b/memory.c
new file mode 100644
index 0000000..2895082
--- /dev/null
+++ b/memory.c
@@ -0,0 +1,109 @@ 
+/*
+ * RAM API
+ *
+ *  Copyright Red Hat, Inc. 2010
+ *
+ * Authors:
+ *  Alex Williamson <alex.williamson@redhat.com>
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, see <http://www.gnu.org/licenses/>.
+ */
+#include "memory.h"
+#include "range.h"
+
+typedef struct QemuRamSlot {
+    target_phys_addr_t start_addr;
+    ram_addr_t size;
+    ram_addr_t offset;
+    QLIST_ENTRY(QemuRamSlot) next;
+} QemuRamSlot;
+
+typedef struct QemuRamSlots {
+    QLIST_HEAD(slots, QemuRamSlot) slots;
+} QemuRamSlots;
+
+static QemuRamSlots ram_slots = { .slots = QLIST_HEAD_INITIALIZER(ram_slots) };
+
+static QemuRamSlot *qemu_ram_find_slot(target_phys_addr_t start_addr,
+                                       ram_addr_t size)
+{
+    QemuRamSlot *slot;
+
+    QLIST_FOREACH(slot, &ram_slots.slots, next) {
+        if (slot->start_addr == start_addr && slot->size == size) {
+            return slot;
+        }
+
+        if (ranges_overlap(start_addr, size, slot->start_addr, slot->size)) {
+            abort();
+        }
+    }
+
+    return NULL;
+}
+
+int qemu_ram_register(target_phys_addr_t start_addr, ram_addr_t size,
+                       ram_addr_t phys_offset)
+{
+    QemuRamSlot *slot;
+
+    if (!size) {
+        return -EINVAL;
+    }
+
+    assert(!qemu_ram_find_slot(start_addr, size));
+
+    slot = qemu_mallocz(sizeof(QemuRamSlot));
+
+    slot->start_addr = start_addr;
+    slot->size = size;
+    slot->offset = phys_offset;
+
+    QLIST_INSERT_HEAD(&ram_slots.slots, slot, next);
+
+    cpu_register_physical_memory(slot->start_addr, slot->size, slot->offset);
+
+    return 0;
+}
+
+void qemu_ram_unregister(target_phys_addr_t start_addr, ram_addr_t size)
+{
+    QemuRamSlot *slot;
+
+    if (!size) {
+        return;
+    }
+
+    slot = qemu_ram_find_slot(start_addr, size);
+    assert(slot != NULL);
+
+    QLIST_REMOVE(slot, next);
+    qemu_free(slot);
+    cpu_register_physical_memory(start_addr, size, IO_MEM_UNASSIGNED);
+
+    return;
+}
+
+int qemu_ram_for_each_slot(void *opaque, qemu_ram_for_each_slot_fn fn)
+{
+    QemuRamSlot *slot;
+
+    QLIST_FOREACH(slot, &ram_slots.slots, next) {
+        int ret = fn(opaque, slot->start_addr, slot->size, slot->offset);
+        if (ret) {
+            return ret;
+        }
+    }
+    return 0;
+}
diff --git a/memory.h b/memory.h
new file mode 100644
index 0000000..0c17ff9
--- /dev/null
+++ b/memory.h
@@ -0,0 +1,18 @@ 
+#ifndef QEMU_MEMORY_H
+#define QEMU_MEMORY_H
+
+#include "qemu-common.h"
+#include "cpu-common.h"
+
+int qemu_ram_register(target_phys_addr_t start_addr, ram_addr_t size,
+                      ram_addr_t phys_offset);
+
+void qemu_ram_unregister(target_phys_addr_t start_addr, ram_addr_t size);
+
+typedef int (*qemu_ram_for_each_slot_fn)(void *opaque,
+                                         target_phys_addr_t start_addr,
+                                         ram_addr_t size,
+                                         ram_addr_t phys_offset);
+
+int qemu_ram_for_each_slot(void *opaque, qemu_ram_for_each_slot_fn fn);
+#endif