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qemu: Create hugepage path on per domain basis

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If you've ever tried running a huge page backed guest under
different user than in qemu.conf, you probably failed. Problem is
even though we have corresponding APIs in the security drivers,
there's no implementation and thus we don't relabel the huge page
path. But even if we did, so far all of the domains share the
same path:

   /hugepageMount/libvirt/qemu

Our only option there would be to set 0777 mode on the qemu dir
which is totally unsafe. Therefore, we can create dir on
per-domain basis, i.e.:

   /hugepageMount/libvirt/qemu/domainName

and chown domainName dir to the user that domain is configured to
run under.

Signed-off-by: Michal Privoznik <mprivozn@redhat.com>
This commit is contained in:
Michal Privoznik
2016-12-08 15:45:52 +01:00
parent 7ed6934f3b
commit f55afd83b1
14 changed files with 130 additions and 78 deletions
Download Patch File Download Diff File Expand all files Collapse all files
tests/qemuxml2argvdata/qemuxml2argv-hugepages-numa.args
+3 -3
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@@ -11,11 +11,11 @@ QEMU_AUDIO_DRV=spice \
-m size=1048576k,slots=16,maxmem=1099511627776k \
-smp 2,sockets=2,cores=1,threads=1 \
-mem-prealloc \
-mem-path /dev/hugepages2M/libvirt/qemu \
-mem-path /dev/hugepages2M/libvirt/qemu/-1-fedora \
-numa node,nodeid=0,cpus=0-1,mem=1024 \
-object memory-backend-file,id=memdimm0,prealloc=yes,\
mem-path=/dev/hugepages1G/libvirt/qemu,size=1073741824,host-nodes=1-3,\
policy=bind \
mem-path=/dev/hugepages1G/libvirt/qemu/-1-fedora,size=1073741824,\
host-nodes=1-3,policy=bind \
-device pc-dimm,node=0,memdev=memdimm0,id=dimm0,slot=0 \
-uuid 63840878-0deb-4095-97e6-fc444d9bc9fa \
-nodefaults \
tests/qemuxml2argvdata/qemuxml2argv-hugepages-pages.args
+8 -8
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@@ -11,20 +11,20 @@ QEMU_AUDIO_DRV=none \
-m 4096 \
-smp 4,sockets=4,cores=1,threads=1 \
-object memory-backend-file,id=ram-node0,prealloc=yes,\
mem-path=/dev/hugepages1G/libvirt/qemu,size=1073741824,host-nodes=0-3,\
policy=bind \
mem-path=/dev/hugepages1G/libvirt/qemu/-1-QEMUGuest1,size=1073741824,\
host-nodes=0-3,policy=bind \
-numa node,nodeid=0,cpus=0,memdev=ram-node0 \
-object memory-backend-file,id=ram-node1,prealloc=yes,\
mem-path=/dev/hugepages2M/libvirt/qemu,size=1073741824,host-nodes=0-3,\
policy=bind \
mem-path=/dev/hugepages2M/libvirt/qemu/-1-QEMUGuest1,size=1073741824,\
host-nodes=0-3,policy=bind \
-numa node,nodeid=1,cpus=1,memdev=ram-node1 \
-object memory-backend-file,id=ram-node2,prealloc=yes,\
mem-path=/dev/hugepages1G/libvirt/qemu,size=1073741824,host-nodes=0-3,\
policy=bind \
mem-path=/dev/hugepages1G/libvirt/qemu/-1-QEMUGuest1,size=1073741824,\
host-nodes=0-3,policy=bind \
-numa node,nodeid=2,cpus=2,memdev=ram-node2 \
-object memory-backend-file,id=ram-node3,prealloc=yes,\
mem-path=/dev/hugepages1G/libvirt/qemu,size=1073741824,host-nodes=3,\
policy=bind \
mem-path=/dev/hugepages1G/libvirt/qemu/-1-QEMUGuest1,size=1073741824,\
host-nodes=3,policy=bind \
-numa node,nodeid=3,cpus=3,memdev=ram-node3 \
-uuid c7a5fdbd-edaf-9455-926a-d65c16db1809 \
-nographic \
tests/qemuxml2argvdata/qemuxml2argv-hugepages-pages2.args
+1 -1
View File
@@ -11,7 +11,7 @@ QEMU_AUDIO_DRV=none \
-m 1024 \
-smp 2,sockets=2,cores=1,threads=1 \
-mem-prealloc \
-mem-path /dev/hugepages2M/libvirt/qemu \
-mem-path /dev/hugepages2M/libvirt/qemu/-1-SomeDummyHugepagesGu \
-numa node,nodeid=0,cpus=0,mem=256 \
-numa node,nodeid=1,cpus=1,mem=768 \
-uuid ef1bdff4-27f3-4e85-a807-5fb4d58463cc \
tests/qemuxml2argvdata/qemuxml2argv-hugepages-pages3.args
+1 -1
View File
@@ -13,7 +13,7 @@ QEMU_AUDIO_DRV=none \
-object memory-backend-ram,id=ram-node0,size=268435456 \
-numa node,nodeid=0,cpus=0,memdev=ram-node0 \
-object memory-backend-file,id=ram-node1,prealloc=yes,\
mem-path=/dev/hugepages1G/libvirt/qemu,size=805306368 \
mem-path=/dev/hugepages1G/libvirt/qemu/-1-SomeDummyHugepagesGu,size=805306368 \
-numa node,nodeid=1,cpus=1,memdev=ram-node1 \
-uuid ef1bdff4-27f3-4e85-a807-5fb4d58463cc \
-nographic \
tests/qemuxml2argvdata/qemuxml2argv-hugepages-pages5.args
+1 -1
View File
@@ -10,7 +10,7 @@ QEMU_AUDIO_DRV=none \
-M pc \
-m 1024 \
-mem-prealloc \
-mem-path /dev/hugepages2M/libvirt/qemu \
-mem-path /dev/hugepages2M/libvirt/qemu/-1-SomeDummyHugepagesGu \
-smp 2,sockets=2,cores=1,threads=1 \
-uuid ef1bdff4-27f3-4e85-a807-5fb4d58463cc \
-nographic \
tests/qemuxml2argvdata/qemuxml2argv-hugepages-shared.args
+7 -7
View File
@@ -11,20 +11,20 @@ QEMU_AUDIO_DRV=none \
-m 4096 \
-smp 4,sockets=4,cores=1,threads=1 \
-object memory-backend-file,id=ram-node0,prealloc=yes,\
mem-path=/dev/hugepages1G/libvirt/qemu,size=1073741824,host-nodes=0-3,\
policy=bind \
mem-path=/dev/hugepages1G/libvirt/qemu/-1-QEMUGuest1,size=1073741824,\
host-nodes=0-3,policy=bind \
-numa node,nodeid=0,cpus=0,memdev=ram-node0 \
-object memory-backend-file,id=ram-node1,prealloc=yes,\
mem-path=/dev/hugepages2M/libvirt/qemu,share=yes,size=1073741824,\
mem-path=/dev/hugepages2M/libvirt/qemu/-1-QEMUGuest1,share=yes,size=1073741824,\
host-nodes=0-3,policy=bind \
-numa node,nodeid=1,cpus=1,memdev=ram-node1 \
-object memory-backend-file,id=ram-node2,prealloc=yes,\
mem-path=/dev/hugepages1G/libvirt/qemu,share=no,size=1073741824,host-nodes=0-3,\
policy=bind \
mem-path=/dev/hugepages1G/libvirt/qemu/-1-QEMUGuest1,share=no,size=1073741824,\
host-nodes=0-3,policy=bind \
-numa node,nodeid=2,cpus=2,memdev=ram-node2 \
-object memory-backend-file,id=ram-node3,prealloc=yes,\
mem-path=/dev/hugepages1G/libvirt/qemu,size=1073741824,host-nodes=3,\
policy=bind \
mem-path=/dev/hugepages1G/libvirt/qemu/-1-QEMUGuest1,size=1073741824,\
host-nodes=3,policy=bind \
-numa node,nodeid=3,cpus=3,memdev=ram-node3 \
-uuid c7a5fdbd-edaf-9455-926a-d65c16db1809 \
-nographic \
tests/qemuxml2argvdata/qemuxml2argv-hugepages.args
+1 -1
View File
@@ -10,7 +10,7 @@ QEMU_AUDIO_DRV=none \
-M pc \
-m 214 \
-mem-prealloc \
-mem-path /dev/hugepages2M/libvirt/qemu \
-mem-path /dev/hugepages2M/libvirt/qemu/-1-QEMUGuest1 \
-smp 1,sockets=1,cores=1,threads=1 \
-uuid c7a5fdbd-edaf-9455-926a-d65c16db1809 \
-nographic \
tests/qemuxml2argvdata/qemuxml2argv-memory-hotplug-dimm-addr.args
+2 -2
View File
@@ -12,8 +12,8 @@ QEMU_AUDIO_DRV=none \
-smp 2,sockets=2,cores=1,threads=1 \
-numa node,nodeid=0,cpus=0-1,mem=214 \
-object memory-backend-file,id=memdimm0,prealloc=yes,\
mem-path=/dev/hugepages2M/libvirt/qemu,size=536870912,host-nodes=1-3,\
policy=bind \
mem-path=/dev/hugepages2M/libvirt/qemu/-1-QEMUGuest1,size=536870912,\
host-nodes=1-3,policy=bind \
-device pc-dimm,node=0,memdev=memdimm0,id=dimm0,slot=0,addr=4294967296 \
-object memory-backend-ram,id=memdimm2,size=536870912 \
-device pc-dimm,node=0,memdev=memdimm2,id=dimm2,slot=2 \
tests/qemuxml2argvdata/qemuxml2argv-memory-hotplug-dimm.args
+2 -2
View File
@@ -14,8 +14,8 @@ QEMU_AUDIO_DRV=none \
-object memory-backend-ram,id=memdimm0,size=536870912 \
-device pc-dimm,node=0,memdev=memdimm0,id=dimm0,slot=0 \
-object memory-backend-file,id=memdimm1,prealloc=yes,\
mem-path=/dev/hugepages2M/libvirt/qemu,size=536870912,host-nodes=1-3,\
policy=bind \
mem-path=/dev/hugepages2M/libvirt/qemu/-1-QEMUGuest1,size=536870912,\
host-nodes=1-3,policy=bind \
-device pc-dimm,node=0,memdev=memdimm1,id=dimm1,slot=1 \
-uuid c7a5fdbd-edaf-9455-926a-d65c16db1809 \
-nographic \