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Re: [Qemu-devel] [PATCH] pc: ACPI BIOS: use highest NUMA node for hotplu
From: |
Michael S. Tsirkin |
Subject: |
Re: [Qemu-devel] [PATCH] pc: ACPI BIOS: use highest NUMA node for hotplug mem hole SRAT entry |
Date: |
Thu, 25 May 2017 01:04:55 +0300 |
On Wed, May 24, 2017 at 11:16:14AM +0200, Ladi Prosek wrote:
> On Wed, May 24, 2017 at 11:07 AM, Laszlo Ersek <address@hidden> wrote:
> > On 05/24/17 10:09, Ladi Prosek wrote:
> >> For reasons unknown, Windows won't online all memory, both at command
> >> line and hot-plugged later, unless the hotplug mem hole SRAT entry
> >> specifies a node greater or equal to the ones where memory is added.
> >
> > s/greater or equal to/greater *than* or equal to/
> >
> > Thanks,
> > Laszlo
> > (always finding the important issues! ;) )
>
> Haha, thanks! Igor, please let me know if you'd like me to send a
> corrected version.
Yes and pls include Igor's note to maintainer after --- so I don't
forget.
> >>
> >> Using the highest node on the machine makes recent versions of Windows
> >> happy.
> >>
> >> With this example command line:
> >> ... \
> >> -m 1024,slots=4,maxmem=32G \
> >> -numa node,nodeid=0 \
> >> -numa node,nodeid=1 \
> >> -numa node,nodeid=2 \
> >> -numa node,nodeid=3 \
> >> -object memory-backend-ram,size=1G,id=mem-mem1 \
> >> -device pc-dimm,id=dimm-mem1,memdev=mem-mem1,node=1
> >>
> >> Windows reports a total of 1G of RAM without this commit and the expected
> >> 2G with this commit.
> >>
> >> Signed-off-by: Ladi Prosek <address@hidden>
> >> ---
> >> hw/i386/acpi-build.c | 7 +++++--
> >> 1 file changed, 5 insertions(+), 2 deletions(-)
> >>
> >> diff --git a/hw/i386/acpi-build.c b/hw/i386/acpi-build.c
> >> index afcadac..9653583 100644
> >> --- a/hw/i386/acpi-build.c
> >> +++ b/hw/i386/acpi-build.c
> >> @@ -2404,14 +2404,17 @@ build_srat(GArray *table_data, BIOSLinker *linker,
> >> MachineState *machine)
> >> }
> >>
> >> /*
> >> - * Entry is required for Windows to enable memory hotplug in OS.
> >> + * Entry is required for Windows to enable memory hotplug in OS
> >> + * and for Linux to enable SWIOTLB even if booted with less than
> >> + * 4G of RAM. Windows works better if the entry sets proximity
> >> + * to the highest NUMA node in the machine.
> >> * Memory devices may override proximity set by this entry,
> >> * providing _PXM method if necessary.
> >> */
> >> if (hotplugabble_address_space_size) {
> >> numamem = acpi_data_push(table_data, sizeof *numamem);
> >> build_srat_memory(numamem, pcms->hotplug_memory.base,
> >> - hotplugabble_address_space_size, 0,
> >> + hotplugabble_address_space_size,
> >> pcms->numa_nodes - 1,
> >> MEM_AFFINITY_HOTPLUGGABLE |
> >> MEM_AFFINITY_ENABLED);
> >> }
> >>
> >>
> >