hw/cxl/cxl-mailbox-utils.c | 658 +++++++++++++++++++++++++++++++++++- hw/mem/cxl_type3.c | 634 ++++++++++++++++++++++++++++++++-- hw/mem/cxl_type3_stubs.c | 25 ++ include/hw/cxl/cxl_device.h | 85 ++++- include/hw/cxl/cxl_events.h | 18 + qapi/cxl.json | 143 ++++++++ 6 files changed, 1511 insertions(+), 52 deletions(-)
From: Fan Ni <nifan.cxl@gmail.com>
A git tree of this series can be found here (with one extra commit on top
for printing out accepted/pending extent list for testing):
https://github.com/moking/qemu/tree/dcd-v8-qapi
v7->v8:
This version carries over the following two patches from Gregory.
1. hw/cxl/mailbox: change CCI cmd set structure to be a member, not a reference
https://gitlab.com/jic23/qemu/-/commit/f44ebc5a455ccdd6535879b0c5824e0d76b04da5
2. hw/cxl/mailbox: interface to add CCI commands to an existing CCI
https://gitlab.com/jic23/qemu/-/commit/00a4dd8b388add03c588298f665ee918626296a5
Note, the above two patches are not directly related to DCD emulation.
All the following patches in this series are built on top of mainstream QEMU
and the above two patches.
The most significant changes of v8 is in Patch 11 (Patch 9 in v7). Based on
feedback from Markus and Jonathan, the QMP interfaces for adding and releasing
DC extents have been redesigned and now they look like below,
# add a 128MB extent at offset 0 to region 0
{ "execute": "cxl-add-dynamic-capacity",
"arguments": {
"path": "/machine/peripheral/cxl-memdev0",
"host-id":0,
"selection-policy": 'prescriptive',
"region": 0,
"tag": "",
"extents": [
{
"offset": 0,
"len": 134217728
}
]
}
}
Note: tag is optional.
# Release a 128MB extent at offset 0 from region 0
{ "execute": "cxl-release-dynamic-capacity",
"arguments": {
"path": "/machine/peripheral/cxl-memdev0",
"host-id":0,
"removal-policy":"prescriptive",
"forced-removal": false,
"sanitize-on-release": false,
"region": 0,
"tag": "",
"extents": [
{
"offset": 0,
"len": 134217728
}
]
}
}
Note: removal-policy, sanitize-on-release and tag are optional.
Other changes include,
1. Applied tags to patches.
2. Replaced error_setq with error_append_hint for cxl_create_dc_region error
case in Patch 6 (Patch 4 in v7); (Zhijian Li)
3. Updated the error message to include region size information in
cxl_create_dc_region.
4. set range1_size_hi to 0 for DCD in build_dvsec. (Jonathan)
5. Several minor format fixes.
Thanks Markus, Jonathan, Gregory, and Zhijian for reviewing v7 and
svetly Todorov for testing v7.
This series pass the same tests as v7 check the cover letter of v7 for
more details. Additionally, we tested the QAPI interface for
adding/releasing DC extents with optional input parameters.
v7: https://lore.kernel.org/linux-cxl/5856b7a4-4082-465f-9f61-b1ec6c35ef0f@fujitsu.com/T/#mec4c85022ce28c80b241aaf2d5431cadaa45f097
Fan Ni (12):
hw/cxl/cxl-mailbox-utils: Add dc_event_log_size field to output
payload of identify memory device command
hw/cxl/cxl-mailbox-utils: Add dynamic capacity region representative
and mailbox command support
include/hw/cxl/cxl_device: Rename mem_size as static_mem_size for
type3 memory devices
hw/mem/cxl_type3: Add support to create DC regions to type3 memory
devices
hw/mem/cxl-type3: Refactor ct3_build_cdat_entries_for_mr to take mr
size instead of mr as argument
hw/mem/cxl_type3: Add host backend and address space handling for DC
regions
hw/mem/cxl_type3: Add DC extent list representative and get DC extent
list mailbox support
hw/cxl/cxl-mailbox-utils: Add mailbox commands to support add/release
dynamic capacity response
hw/cxl/events: Add qmp interfaces to add/release dynamic capacity
extents
hw/mem/cxl_type3: Add DPA range validation for accesses to DC regions
hw/cxl/cxl-mailbox-utils: Add superset extent release mailbox support
hw/mem/cxl_type3: Allow to release extent superset in QMP interface
Gregory Price (2):
hw/cxl/mailbox: change CCI cmd set structure to be a member, not a
reference
hw/cxl/mailbox: interface to add CCI commands to an existing CCI
hw/cxl/cxl-mailbox-utils.c | 658 +++++++++++++++++++++++++++++++++++-
hw/mem/cxl_type3.c | 634 ++++++++++++++++++++++++++++++++--
hw/mem/cxl_type3_stubs.c | 25 ++
include/hw/cxl/cxl_device.h | 85 ++++-
include/hw/cxl/cxl_events.h | 18 +
qapi/cxl.json | 143 ++++++++
6 files changed, 1511 insertions(+), 52 deletions(-)
--
2.43.0
On Thu, 23 May 2024 10:44:40 -0700
nifan.cxl@gmail.com wrote:
> From: Fan Ni <nifan.cxl@gmail.com>
>
> A git tree of this series can be found here (with one extra commit on
> top for printing out accepted/pending extent list for testing):
> https://github.com/moking/qemu/tree/dcd-v8-qapi
>
> v7->v8:
>
> This version carries over the following two patches from Gregory.
> 1. hw/cxl/mailbox: change CCI cmd set structure to be a member, not a
> reference https://gitlab.com/jic23/qemu/-/commit/f44ebc5a455ccdd6535879b0c5824e0d76b04da5
> 2. hw/cxl/mailbox: interface to add CCI commands to an existing CCI
> https://gitlab.com/jic23/qemu/-/commit/00a4dd8b388add03c588298f665ee918626296a5
>
> Note, the above two patches are not directly related to DCD emulation.
>
> All the following patches in this series are built on top of
> mainstream QEMU and the above two patches.
>
> The most significant changes of v8 is in Patch 11 (Patch 9 in v7).
> Based on feedback from Markus and Jonathan, the QMP interfaces for
> adding and releasing DC extents have been redesigned and now they
> look like below,
>
> # add a 128MB extent at offset 0 to region 0
> { "execute": "cxl-add-dynamic-capacity",
> "arguments": {
> "path": "/machine/peripheral/cxl-memdev0",
> "host-id":0,
> "selection-policy": 'prescriptive',
> "region": 0,
> "tag": "",
> "extents": [
> {
> "offset": 0,
> "len": 134217728
> }
> ]
> }
> }
>
> Note: tag is optional.
>
> # Release a 128MB extent at offset 0 from region 0
> { "execute": "cxl-release-dynamic-capacity",
> "arguments": {
> "path": "/machine/peripheral/cxl-memdev0",
> "host-id":0,
> "removal-policy":"prescriptive",
> "forced-removal": false,
> "sanitize-on-release": false,
> "region": 0,
> "tag": "",
> "extents": [
> {
> "offset": 0,
> "len": 134217728
> }
> ]
> }
> }
>
> Note: removal-policy, sanitize-on-release and tag are optional.
>
> Other changes include,
> 1. Applied tags to patches.
> 2. Replaced error_setq with error_append_hint for
> cxl_create_dc_region error case in Patch 6 (Patch 4 in v7); (Zhijian
> Li) 3. Updated the error message to include region size information in
> cxl_create_dc_region.
> 4. set range1_size_hi to 0 for DCD in build_dvsec. (Jonathan)
> 5. Several minor format fixes.
>
> Thanks Markus, Jonathan, Gregory, and Zhijian for reviewing v7 and
> svetly Todorov for testing v7.
>
> This series pass the same tests as v7 check the cover letter of v7 for
> more details. Additionally, we tested the QAPI interface for
> adding/releasing DC extents with optional input parameters.
>
>
> v7: https://lore.kernel.org/linux-cxl/5856b7a4-4082-465f-9f61-b1ec6c35ef0f@fujitsu.com/T/#mec4c85022ce28c80b241aaf2d5431cadaa45f097
>
>
> Fan Ni (12):
> hw/cxl/cxl-mailbox-utils: Add dc_event_log_size field to output
> payload of identify memory device command
> hw/cxl/cxl-mailbox-utils: Add dynamic capacity region representative
> and mailbox command support
> include/hw/cxl/cxl_device: Rename mem_size as static_mem_size for
> type3 memory devices
> hw/mem/cxl_type3: Add support to create DC regions to type3 memory
> devices
> hw/mem/cxl-type3: Refactor ct3_build_cdat_entries_for_mr to take mr
> size instead of mr as argument
> hw/mem/cxl_type3: Add host backend and address space handling for DC
> regions
> hw/mem/cxl_type3: Add DC extent list representative and get DC
> extent list mailbox support
> hw/cxl/cxl-mailbox-utils: Add mailbox commands to support
> add/release dynamic capacity response
> hw/cxl/events: Add qmp interfaces to add/release dynamic capacity
> extents
> hw/mem/cxl_type3: Add DPA range validation for accesses to DC
> regions hw/cxl/cxl-mailbox-utils: Add superset extent release mailbox
> support hw/mem/cxl_type3: Allow to release extent superset in QMP
> interface
>
> Gregory Price (2):
> hw/cxl/mailbox: change CCI cmd set structure to be a member, not a
> reference
> hw/cxl/mailbox: interface to add CCI commands to an existing CCI
>
> hw/cxl/cxl-mailbox-utils.c | 658
> +++++++++++++++++++++++++++++++++++- hw/mem/cxl_type3.c |
> 634 ++++++++++++++++++++++++++++++++-- hw/mem/cxl_type3_stubs.c |
> 25 ++ include/hw/cxl/cxl_device.h | 85 ++++-
> include/hw/cxl/cxl_events.h | 18 +
> qapi/cxl.json | 143 ++++++++
> 6 files changed, 1511 insertions(+), 52 deletions(-)
>
Hi Nifan,
I am trying to test this patchset with Ira's set on DCD, and I am
trying to work out everything by using sysfs rather than using tools
instead. I am not sure where things are going of the rail.
I am using this patchset
(https://lore.kernel.org/qemu-devel/20240523174651.1089554-2-nifan.cxl@gmail.com/) with Ira's v9 https://lore.kernel.org/all/20250413-dcd-type2-upstream-v9-0-1d4911a0b365@intel.com/
This my CXL config:
return [
"-m", "6G,maxmem=20G,slots=10",
"-object", "memory-backend-ram,id=vmem0,share=on,size=2G",
"-device", "pxb-cxl,bus_nr=23,bus=pcie.0,id=cxl.1",
"-device","cxl-rp,port=0,bus=cxl.1,id=root_port13,chassis=0,slot=2",
"-device","cxl-type3,bus=root_port13,volatile-dc-memdev=vmem0,id=cxl-vmem0,num-dc-regions=2",
"-M", "cxl=on,cxl-fmw.0.targets.0=cxl.1,cxl-fmw.0.size=4G"
]
This is how I create a new CXL DC Region ready to work with.
# creating a region
region=$(cat
/sys/bus/cxl/devices/decoder0.0/create_dynamic_ram_a_region)
echo $region
echo $region >
/sys/bus/cxl/devices/decoder0.0/create_dynamic_ram_a_region
echo 256 > /sys/bus/cxl/devices/$region/interleave_granularity
echo 1 > /sys/bus/cxl/devices/$region/interleave_ways
echo "dynamic_ram_a" > /sys/bus/cxl/devices/decoder2.0/mode
echo $((256 << 20)) > /sys/bus/cxl/devices/decoder2.0/dpa_size
echo $((256 << 20)) > /sys/bus/cxl/devices/$region/size
echo "decoder2.0" > /sys/bus/cxl/devices/$region/target0
echo 1 > /sys/bus/cxl/devices/$region/commit
echo $region > /sys/bus/cxl/drivers/cxl_region/bind
After this I have two things created, region0 and dax_region0:
root@localhost:~# ls /sys/bus/cxl/devices/
dax_region0/ decoder1.0/ decoder1.2/ decoder2.0/
decoder2.2/ endpoint2/ nvdimm-bridge0/ region0/ decoder0.0/
decoder1.1/ decoder1.3/ decoder2.1/ decoder2.3/ mem0/
port1/ root0/
This is what I have in dax_region0:
root@localhost:~# ls /sys/bus/cxl/devices/dax_region0/
dax0.0 dax_region devtype driver modalias subsystem uevent
Now I want to add an extent, and this is how I am doing it:
{ "execute": "cxl-add-dynamic-capacity",
"arguments": {
"path": "/machine/peripheral/cxl-memdev0",
"host-id":0,
"selection-policy": 'prescriptive',
"region": 0,
"tag": "",
"extents": [
{
"offset": 0,
"len": 134217728
}
]
}
}
Now I see the extent added in my region device:
root@localhost:~# ls /sys/bus/cxl/devices/dax_region0/
dax0.0 dax_region devtype driver extent0.0 modalias subsystem
uevent root@localhost:~# ls /sys/bus/cxl/devices/dax_region0/extent0.0/
length offset uevent
This is where things will go off the rails, at this point I want to
create a new dax device to use, but this part is unsuccessful. Here I
first add some size to the dax region created before:
root@localhost:~# echo 67108864 > /sys/bus/dax/devices/dax0.0/size
[264.539280] dax:alloc_dev_dax_range:1015: dax dax0.0: alloc range[0]:
0x0000000810000000:0x0000000813ffffff
When I check the size everything looks OK:
root@localhost:~# cat /sys/bus/dax/devices/dax0.0/size
67108864
But when I want to bind it then it does not work:
root@localhost:~# echo "dax0.0" > /sys/bus/dax/drivers/device_dax/bind
-bash: echo: write error: No such device
I believe I am missing something here. Would be good if you can help
out here.
Thanks,
Alireza
On Wed, Jun 25, 2025 at 03:22:34PM +0100, Alireza Sanaee wrote:
> On Thu, 23 May 2024 10:44:40 -0700
> nifan.cxl@gmail.com wrote:
>
> > From: Fan Ni <nifan.cxl@gmail.com>
> >
> > A git tree of this series can be found here (with one extra commit on
> > top for printing out accepted/pending extent list for testing):
> > https://github.com/moking/qemu/tree/dcd-v8-qapi
> >
> > v7->v8:
> >
> > This version carries over the following two patches from Gregory.
> > 1. hw/cxl/mailbox: change CCI cmd set structure to be a member, not a
> > reference https://gitlab.com/jic23/qemu/-/commit/f44ebc5a455ccdd6535879b0c5824e0d76b04da5
> > 2. hw/cxl/mailbox: interface to add CCI commands to an existing CCI
> > https://gitlab.com/jic23/qemu/-/commit/00a4dd8b388add03c588298f665ee918626296a5
> >
> > Note, the above two patches are not directly related to DCD emulation.
> >
> > All the following patches in this series are built on top of
> > mainstream QEMU and the above two patches.
> >
> > The most significant changes of v8 is in Patch 11 (Patch 9 in v7).
> > Based on feedback from Markus and Jonathan, the QMP interfaces for
> > adding and releasing DC extents have been redesigned and now they
> > look like below,
> >
> > # add a 128MB extent at offset 0 to region 0
> > { "execute": "cxl-add-dynamic-capacity",
> > "arguments": {
> > "path": "/machine/peripheral/cxl-memdev0",
> > "host-id":0,
> > "selection-policy": 'prescriptive',
> > "region": 0,
> > "tag": "",
> > "extents": [
> > {
> > "offset": 0,
> > "len": 134217728
> > }
> > ]
> > }
> > }
> >
> > Note: tag is optional.
> >
> > # Release a 128MB extent at offset 0 from region 0
> > { "execute": "cxl-release-dynamic-capacity",
> > "arguments": {
> > "path": "/machine/peripheral/cxl-memdev0",
> > "host-id":0,
> > "removal-policy":"prescriptive",
> > "forced-removal": false,
> > "sanitize-on-release": false,
> > "region": 0,
> > "tag": "",
> > "extents": [
> > {
> > "offset": 0,
> > "len": 134217728
> > }
> > ]
> > }
> > }
> >
> > Note: removal-policy, sanitize-on-release and tag are optional.
> >
> > Other changes include,
> > 1. Applied tags to patches.
> > 2. Replaced error_setq with error_append_hint for
> > cxl_create_dc_region error case in Patch 6 (Patch 4 in v7); (Zhijian
> > Li) 3. Updated the error message to include region size information in
> > cxl_create_dc_region.
> > 4. set range1_size_hi to 0 for DCD in build_dvsec. (Jonathan)
> > 5. Several minor format fixes.
> >
> > Thanks Markus, Jonathan, Gregory, and Zhijian for reviewing v7 and
> > svetly Todorov for testing v7.
> >
> > This series pass the same tests as v7 check the cover letter of v7 for
> > more details. Additionally, we tested the QAPI interface for
> > adding/releasing DC extents with optional input parameters.
> >
> >
> > v7: https://lore.kernel.org/linux-cxl/5856b7a4-4082-465f-9f61-b1ec6c35ef0f@fujitsu.com/T/#mec4c85022ce28c80b241aaf2d5431cadaa45f097
> >
> >
> > Fan Ni (12):
> > hw/cxl/cxl-mailbox-utils: Add dc_event_log_size field to output
> > payload of identify memory device command
> > hw/cxl/cxl-mailbox-utils: Add dynamic capacity region representative
> > and mailbox command support
> > include/hw/cxl/cxl_device: Rename mem_size as static_mem_size for
> > type3 memory devices
> > hw/mem/cxl_type3: Add support to create DC regions to type3 memory
> > devices
> > hw/mem/cxl-type3: Refactor ct3_build_cdat_entries_for_mr to take mr
> > size instead of mr as argument
> > hw/mem/cxl_type3: Add host backend and address space handling for DC
> > regions
> > hw/mem/cxl_type3: Add DC extent list representative and get DC
> > extent list mailbox support
> > hw/cxl/cxl-mailbox-utils: Add mailbox commands to support
> > add/release dynamic capacity response
> > hw/cxl/events: Add qmp interfaces to add/release dynamic capacity
> > extents
> > hw/mem/cxl_type3: Add DPA range validation for accesses to DC
> > regions hw/cxl/cxl-mailbox-utils: Add superset extent release mailbox
> > support hw/mem/cxl_type3: Allow to release extent superset in QMP
> > interface
> >
> > Gregory Price (2):
> > hw/cxl/mailbox: change CCI cmd set structure to be a member, not a
> > reference
> > hw/cxl/mailbox: interface to add CCI commands to an existing CCI
> >
> > hw/cxl/cxl-mailbox-utils.c | 658
> > +++++++++++++++++++++++++++++++++++- hw/mem/cxl_type3.c |
> > 634 ++++++++++++++++++++++++++++++++-- hw/mem/cxl_type3_stubs.c |
> > 25 ++ include/hw/cxl/cxl_device.h | 85 ++++-
> > include/hw/cxl/cxl_events.h | 18 +
> > qapi/cxl.json | 143 ++++++++
> > 6 files changed, 1511 insertions(+), 52 deletions(-)
> >
>
> Hi Nifan,
>
> I am trying to test this patchset with Ira's set on DCD, and I am
> trying to work out everything by using sysfs rather than using tools
> instead. I am not sure where things are going of the rail.
>
> I am using this patchset
> (https://lore.kernel.org/qemu-devel/20240523174651.1089554-2-nifan.cxl@gmail.com/) with Ira's v9 https://lore.kernel.org/all/20250413-dcd-type2-upstream-v9-0-1d4911a0b365@intel.com/
>
> This my CXL config:
> return [
> "-m", "6G,maxmem=20G,slots=10",
> "-object", "memory-backend-ram,id=vmem0,share=on,size=2G",
> "-device", "pxb-cxl,bus_nr=23,bus=pcie.0,id=cxl.1",
> "-device","cxl-rp,port=0,bus=cxl.1,id=root_port13,chassis=0,slot=2",
> "-device","cxl-type3,bus=root_port13,volatile-dc-memdev=vmem0,id=cxl-vmem0,num-dc-regions=2",
> "-M", "cxl=on,cxl-fmw.0.targets.0=cxl.1,cxl-fmw.0.size=4G"
> ]
>
>
> This is how I create a new CXL DC Region ready to work with.
>
> # creating a region
> region=$(cat
> /sys/bus/cxl/devices/decoder0.0/create_dynamic_ram_a_region)
> echo $region
>
> echo $region >
> /sys/bus/cxl/devices/decoder0.0/create_dynamic_ram_a_region
> echo 256 > /sys/bus/cxl/devices/$region/interleave_granularity
> echo 1 > /sys/bus/cxl/devices/$region/interleave_ways
>
> echo "dynamic_ram_a" > /sys/bus/cxl/devices/decoder2.0/mode
> echo $((256 << 20)) > /sys/bus/cxl/devices/decoder2.0/dpa_size
>
> echo $((256 << 20)) > /sys/bus/cxl/devices/$region/size
> echo "decoder2.0" > /sys/bus/cxl/devices/$region/target0
> echo 1 > /sys/bus/cxl/devices/$region/commit
>
> echo $region > /sys/bus/cxl/drivers/cxl_region/bind
>
> After this I have two things created, region0 and dax_region0:
>
> root@localhost:~# ls /sys/bus/cxl/devices/
> dax_region0/ decoder1.0/ decoder1.2/ decoder2.0/
> decoder2.2/ endpoint2/ nvdimm-bridge0/ region0/ decoder0.0/
> decoder1.1/ decoder1.3/ decoder2.1/ decoder2.3/ mem0/
> port1/ root0/
>
> This is what I have in dax_region0:
> root@localhost:~# ls /sys/bus/cxl/devices/dax_region0/
> dax0.0 dax_region devtype driver modalias subsystem uevent
>
> Now I want to add an extent, and this is how I am doing it:
>
> { "execute": "cxl-add-dynamic-capacity",
> "arguments": {
> "path": "/machine/peripheral/cxl-memdev0",
> "host-id":0,
> "selection-policy": 'prescriptive',
> "region": 0,
> "tag": "",
> "extents": [
> {
> "offset": 0,
> "len": 134217728
> }
> ]
> }
> }
>
> Now I see the extent added in my region device:
> root@localhost:~# ls /sys/bus/cxl/devices/dax_region0/
> dax0.0 dax_region devtype driver extent0.0 modalias subsystem
> uevent root@localhost:~# ls /sys/bus/cxl/devices/dax_region0/extent0.0/
> length offset uevent
>
> This is where things will go off the rails, at this point I want to
> create a new dax device to use, but this part is unsuccessful. Here I
> first add some size to the dax region created before:
>
> root@localhost:~# echo 67108864 > /sys/bus/dax/devices/dax0.0/size
> [264.539280] dax:alloc_dev_dax_range:1015: dax dax0.0: alloc range[0]:
> 0x0000000810000000:0x0000000813ffffff
>
> When I check the size everything looks OK:
> root@localhost:~# cat /sys/bus/dax/devices/dax0.0/size
> 67108864
>
> But when I want to bind it then it does not work:
> root@localhost:~# echo "dax0.0" > /sys/bus/dax/drivers/device_dax/bind
> -bash: echo: write error: No such device
>
> I believe I am missing something here. Would be good if you can help
> out here.
>
> Thanks,
> Alireza
Hi Alireza,
My test with this series is always with Ira's ndtcl repos,
I have not tried to test by using sysfs directly.
To understand what it is going wrong, we need to see what is the
difference between the workflow of ndctl and that you use above.
After that, usually when I see an error as above, I will try to gdb the kernel.
Try to debug the step that fails and understand why.
For example, the last step fails, try to gdb "bind_store" function in
drivers/base/bus.c.
Fan
>
--
Fan Ni
On Thu, 23 May 2024 10:44:40 -0700
nifan.cxl@gmail.com wrote:
> From: Fan Ni <nifan.cxl@gmail.com>
>
Hi Fan,
Apologies for slow response to this update - been a busy few weeks and
I knew I was basically happy with this now so it feel down the todo list.
I've taken one last look this morning and looks good to me.
I'll rebase my tree on top of this so that I can start posting the various
other dependent series in the next few days.
For the remaining patches which don't already have my tag,
Reviewed-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Thanks for your hard work on this fiddly series!
I notice Michael has this in his gitlab tree already which is great.
Hopefully that will go smoothly. No problem if I'm too late with
the above tag.
Looks like there are some build issues with format strings though.
https://gitlab.com/mstredhat/qemu/-/jobs/6998408862
I've called that out in the relevant patch.
Jonathan
> A git tree of this series can be found here (with one extra commit on top
> for printing out accepted/pending extent list for testing):
> https://github.com/moking/qemu/tree/dcd-v8-qapi
>
> v7->v8:
>
> This version carries over the following two patches from Gregory.
> 1. hw/cxl/mailbox: change CCI cmd set structure to be a member, not a reference
> https://gitlab.com/jic23/qemu/-/commit/f44ebc5a455ccdd6535879b0c5824e0d76b04da5
> 2. hw/cxl/mailbox: interface to add CCI commands to an existing CCI
> https://gitlab.com/jic23/qemu/-/commit/00a4dd8b388add03c588298f665ee918626296a5
>
> Note, the above two patches are not directly related to DCD emulation.
>
> All the following patches in this series are built on top of mainstream QEMU
> and the above two patches.
>
> The most significant changes of v8 is in Patch 11 (Patch 9 in v7). Based on
> feedback from Markus and Jonathan, the QMP interfaces for adding and releasing
> DC extents have been redesigned and now they look like below,
>
> # add a 128MB extent at offset 0 to region 0
> { "execute": "cxl-add-dynamic-capacity",
> "arguments": {
> "path": "/machine/peripheral/cxl-memdev0",
> "host-id":0,
> "selection-policy": 'prescriptive',
> "region": 0,
> "tag": "",
> "extents": [
> {
> "offset": 0,
> "len": 134217728
> }
> ]
> }
> }
>
> Note: tag is optional.
>
> # Release a 128MB extent at offset 0 from region 0
> { "execute": "cxl-release-dynamic-capacity",
> "arguments": {
> "path": "/machine/peripheral/cxl-memdev0",
> "host-id":0,
> "removal-policy":"prescriptive",
> "forced-removal": false,
> "sanitize-on-release": false,
> "region": 0,
> "tag": "",
> "extents": [
> {
> "offset": 0,
> "len": 134217728
> }
> ]
> }
> }
>
> Note: removal-policy, sanitize-on-release and tag are optional.
>
> Other changes include,
> 1. Applied tags to patches.
> 2. Replaced error_setq with error_append_hint for cxl_create_dc_region error
> case in Patch 6 (Patch 4 in v7); (Zhijian Li)
> 3. Updated the error message to include region size information in
> cxl_create_dc_region.
> 4. set range1_size_hi to 0 for DCD in build_dvsec. (Jonathan)
> 5. Several minor format fixes.
>
> Thanks Markus, Jonathan, Gregory, and Zhijian for reviewing v7 and
> svetly Todorov for testing v7.
>
> This series pass the same tests as v7 check the cover letter of v7 for
> more details. Additionally, we tested the QAPI interface for
> adding/releasing DC extents with optional input parameters.
>
>
> v7: https://lore.kernel.org/linux-cxl/5856b7a4-4082-465f-9f61-b1ec6c35ef0f@fujitsu.com/T/#mec4c85022ce28c80b241aaf2d5431cadaa45f097
>
>
> Fan Ni (12):
> hw/cxl/cxl-mailbox-utils: Add dc_event_log_size field to output
> payload of identify memory device command
> hw/cxl/cxl-mailbox-utils: Add dynamic capacity region representative
> and mailbox command support
> include/hw/cxl/cxl_device: Rename mem_size as static_mem_size for
> type3 memory devices
> hw/mem/cxl_type3: Add support to create DC regions to type3 memory
> devices
> hw/mem/cxl-type3: Refactor ct3_build_cdat_entries_for_mr to take mr
> size instead of mr as argument
> hw/mem/cxl_type3: Add host backend and address space handling for DC
> regions
> hw/mem/cxl_type3: Add DC extent list representative and get DC extent
> list mailbox support
> hw/cxl/cxl-mailbox-utils: Add mailbox commands to support add/release
> dynamic capacity response
> hw/cxl/events: Add qmp interfaces to add/release dynamic capacity
> extents
> hw/mem/cxl_type3: Add DPA range validation for accesses to DC regions
> hw/cxl/cxl-mailbox-utils: Add superset extent release mailbox support
> hw/mem/cxl_type3: Allow to release extent superset in QMP interface
>
> Gregory Price (2):
> hw/cxl/mailbox: change CCI cmd set structure to be a member, not a
> reference
> hw/cxl/mailbox: interface to add CCI commands to an existing CCI
>
> hw/cxl/cxl-mailbox-utils.c | 658 +++++++++++++++++++++++++++++++++++-
> hw/mem/cxl_type3.c | 634 ++++++++++++++++++++++++++++++++--
> hw/mem/cxl_type3_stubs.c | 25 ++
> include/hw/cxl/cxl_device.h | 85 ++++-
> include/hw/cxl/cxl_events.h | 18 +
> qapi/cxl.json | 143 ++++++++
> 6 files changed, 1511 insertions(+), 52 deletions(-)
>
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