Patchwork [RFC,2/5] Minimal RAM API support

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Submitter Alex Williamson
Date July 11, 2010, 6:09 p.m.
Message ID <20100711180923.20121.58599.stgit@localhost6.localdomain6>
Download mbox | patch
Permalink /patch/58533/
State New
Headers show

Comments

Alex Williamson - July 11, 2010, 6:09 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@gmail.com>
---

 Makefile.target |    1 +
 cpu-common.h    |    2 +
 memory.c        |   77 +++++++++++++++++++++++++++++++++++++++++++++++++++++++
 memory.h        |   23 ++++++++++++++++
 4 files changed, 103 insertions(+), 0 deletions(-)
 create mode 100644 memory.c
 create mode 100644 memory.h
Alex Williamson - July 11, 2010, 6:18 p.m.
On Sun, 2010-07-11 at 12:09 -0600, 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@gmail.com>

Oops, I'm making up email address now ;)

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

> ---
> 
>  Makefile.target |    1 +
>  cpu-common.h    |    2 +
>  memory.c        |   77 +++++++++++++++++++++++++++++++++++++++++++++++++++++++
>  memory.h        |   23 ++++++++++++++++
>  4 files changed, 103 insertions(+), 0 deletions(-)
>  create mode 100644 memory.c
>  create mode 100644 memory.h
> 
> diff --git a/Makefile.target b/Makefile.target
> index 7489910..0c1b916 100644
> --- a/Makefile.target
> +++ b/Makefile.target
> @@ -173,6 +173,7 @@ obj-$(CONFIG_VIRTFS) += virtio-9p.o
>  obj-y += rwhandler.o
>  obj-$(CONFIG_KVM) += kvm.o kvm-all.o
>  obj-$(CONFIG_NO_KVM) += kvm-stub.o
> +obj-y += memory.o
>  LIBS+=-lz
>  
>  QEMU_CFLAGS += $(VNC_TLS_CFLAGS)
> diff --git a/cpu-common.h b/cpu-common.h
> index 8d03f4e..7e76f9d 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..f5f9273
> --- /dev/null
> +++ b/memory.c
> @@ -0,0 +1,77 @@
> +/*
> + *  virtual page mapping and translated block handling
> + *
> + *  Copyright (c) 2003 Fabrice Bellard
> + *
> + * 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"
> +
> +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 ((start_addr - slot->start_addr < slot->size) ||
> +            (start_addr + size - slot->start_addr < slot->size))
> +            abort();
> +    }
> +
> +    return NULL;
> +}
> +
> +void qemu_ram_register(target_phys_addr_t start_addr, ram_addr_t size,
> +                       ram_addr_t phys_offset)
> +{
> +    QemuRamSlot *slot;
> +
> +    if (!size)
> +        return;
> +
> +    slot = qemu_ram_find_slot(start_addr, size);
> +    assert(slot == NULL);
> +
> +    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);
> +}
> +
> +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);
> +    cpu_register_physical_memory(start_addr, size, IO_MEM_UNASSIGNED);
> +
> +    return;
> +}
> diff --git a/memory.h b/memory.h
> new file mode 100644
> index 0000000..91e552e
> --- /dev/null
> +++ b/memory.h
> @@ -0,0 +1,23 @@
> +#ifndef QEMU_MEMORY_H
> +#define QEMU_MEMORY_H
> +
> +#include "qemu-common.h"
> +#include "cpu-common.h"
> +
> +typedef struct QemuRamSlot {
> +    target_phys_addr_t start_addr;
> +    ram_addr_t size;
> +    ram_addr_t offset;
> +    void *host;
> +    QLIST_ENTRY(QemuRamSlot) next;
> +} QemuRamSlot;
> +
> +typedef struct QemuRamSlots {
> +    QLIST_HEAD(slots, QemuRamSlot) slots;
> +} QemuRamSlots;
> +extern QemuRamSlots ram_slots;
> +
> +void 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);
> +#endif
>
Avi Kivity - July 11, 2010, 6:20 p.m.
On 07/11/2010 09:09 PM, 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.
>
>   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..f5f9273
> --- /dev/null
> +++ b/memory.c
> @@ -0,0 +1,77 @@
> +/*
> + *  virtual page mapping and translated block handling
> + *
> + *  Copyright (c) 2003 Fabrice Bellard
>    

Really?  Looks like new code.
Alex Williamson - July 11, 2010, 6:24 p.m.
On Sun, 2010-07-11 at 21:20 +0300, Avi Kivity wrote:
> On 07/11/2010 09:09 PM, 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.
> >
> >   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..f5f9273
> > --- /dev/null
> > +++ b/memory.c
> > @@ -0,0 +1,77 @@
> > +/*
> > + *  virtual page mapping and translated block handling
> > + *
> > + *  Copyright (c) 2003 Fabrice Bellard
> >    
> 
> Really?  Looks like new code.

Yeah, I just stole the copyright Anthony used for this file.
Avi Kivity - July 11, 2010, 6:29 p.m.
On 07/11/2010 09:24 PM, Alex Williamson wrote:
>
>    
>> Really?  Looks like new code.
>>      
> Yeah, I just stole the copyright Anthony used for this file.
>
>    

Traditionally, one steals the code and updates the attributions, not the 
other way round.

Patch

diff --git a/Makefile.target b/Makefile.target
index 7489910..0c1b916 100644
--- a/Makefile.target
+++ b/Makefile.target
@@ -173,6 +173,7 @@  obj-$(CONFIG_VIRTFS) += virtio-9p.o
 obj-y += rwhandler.o
 obj-$(CONFIG_KVM) += kvm.o kvm-all.o
 obj-$(CONFIG_NO_KVM) += kvm-stub.o
+obj-y += memory.o
 LIBS+=-lz
 
 QEMU_CFLAGS += $(VNC_TLS_CFLAGS)
diff --git a/cpu-common.h b/cpu-common.h
index 8d03f4e..7e76f9d 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..f5f9273
--- /dev/null
+++ b/memory.c
@@ -0,0 +1,77 @@ 
+/*
+ *  virtual page mapping and translated block handling
+ *
+ *  Copyright (c) 2003 Fabrice Bellard
+ *
+ * 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"
+
+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 ((start_addr - slot->start_addr < slot->size) ||
+            (start_addr + size - slot->start_addr < slot->size))
+            abort();
+    }
+
+    return NULL;
+}
+
+void qemu_ram_register(target_phys_addr_t start_addr, ram_addr_t size,
+                       ram_addr_t phys_offset)
+{
+    QemuRamSlot *slot;
+
+    if (!size)
+        return;
+
+    slot = qemu_ram_find_slot(start_addr, size);
+    assert(slot == NULL);
+
+    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);
+}
+
+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);
+    cpu_register_physical_memory(start_addr, size, IO_MEM_UNASSIGNED);
+
+    return;
+}
diff --git a/memory.h b/memory.h
new file mode 100644
index 0000000..91e552e
--- /dev/null
+++ b/memory.h
@@ -0,0 +1,23 @@ 
+#ifndef QEMU_MEMORY_H
+#define QEMU_MEMORY_H
+
+#include "qemu-common.h"
+#include "cpu-common.h"
+
+typedef struct QemuRamSlot {
+    target_phys_addr_t start_addr;
+    ram_addr_t size;
+    ram_addr_t offset;
+    void *host;
+    QLIST_ENTRY(QemuRamSlot) next;
+} QemuRamSlot;
+
+typedef struct QemuRamSlots {
+    QLIST_HEAD(slots, QemuRamSlot) slots;
+} QemuRamSlots;
+extern QemuRamSlots ram_slots;
+
+void 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);
+#endif