diff options
| author | Igor Mammedov <imammedo@redhat.com> | 2014-10-31 16:38:42 +0000 |
|---|---|---|
| committer | Michael S. Tsirkin <mst@redhat.com> | 2014-11-24 20:57:10 +0200 |
| commit | 085f8e88ba73b7ff80298b0085f6e615d3b5c45f (patch) | |
| tree | 79425a9f70b4e272a94ab2c8f8b2b038fee001c1 | |
| parent | b03541fa7722d64a1c961a8467d778d7e086a933 (diff) | |
| download | qemu-085f8e88ba73b7ff80298b0085f6e615d3b5c45f.tar.gz | |
pc: count in 1Gb hugepage alignment when sizing hotplug-memory container
if DIMMs with different size/alignment are interleaved
in creation order, it could lead to hotplug-memory
container fragmentation and following inability to use
all RAM upto maxmem.
For example:
-m 4G,slots=3,maxmem=7G
-object memory-backend-file,id=mem-1,size=256M,mem-path=/pagesize-2MB
-device pc-dimm,id=mem1,memdev=mem-1
-object memory-backend-file,id=mem-2,size=1G,mem-path=/pagesize-1GB
-device pc-dimm,id=mem2,memdev=mem-2
-object memory-backend-file,id=mem-3,size=256M,mem-path=/pagesize-2MB
-device pc-dimm,id=mem3,memdev=mem-3
fragments hotplug-memory container and doesn't allow
to use 1GB hugepage backend to consume remainig 1Gb.
To ease managment factor count in max 1Gb alignment for
each memory slot when sizing hotplug-memory region so
that regadless of fragmentaion it would be possible to
add max aligned DIMM.
Signed-off-by: Igor Mammedov <imammedo@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
| -rw-r--r-- | hw/i386/pc.c | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/hw/i386/pc.c b/hw/i386/pc.c index 3d732cf5a5..8be50a4ad6 100644 --- a/hw/i386/pc.c +++ b/hw/i386/pc.c @@ -1247,6 +1247,11 @@ FWCfgState *pc_memory_init(MachineState *machine, pcms->hotplug_memory_base = ROUND_UP(0x100000000ULL + above_4g_mem_size, 1ULL << 30); + if (pcms->enforce_aligned_dimm) { + /* size hotplug region assuming 1G page max alignment per slot */ + hotplug_mem_size += (1ULL << 30) * machine->ram_slots; + } + if ((pcms->hotplug_memory_base + hotplug_mem_size) < hotplug_mem_size) { error_report("unsupported amount of maximum memory: " RAM_ADDR_FMT, |