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qemu: domain: Reject shared disk access if backing format does not support it

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Disk sharing between two VMs may corrupt the images if the format driver
does not support it. Check that the user declared use of a supported
storage format when they want to share the disk.

Resolves: https://bugzilla.redhat.com/show_bug.cgi?id=1511480
This commit is contained in:
Peter Krempa 2017-11-14 15:37:09 +01:00
parent 1fc3cd8731
commit 3b03a27cd0
5 changed files with 58 additions and 2 deletions
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27
src/qemu/qemu_domain.c
View File

@ -25,6 +25,7 @@
#include "qemu_domain.h"
#include "qemu_alias.h"
#include "qemu_block.h"
#include "qemu_cgroup.h"
#include "qemu_command.h"
#include "qemu_process.h"
@ -3724,6 +3725,29 @@ qemuDomainDeviceDefValidateVideo(const virDomainVideoDef *video)
}
static int
qemuDomainDeviceDefValidateDisk(const virDomainDiskDef *disk)
{
if (disk->src->shared && !disk->src->readonly) {
if (disk->src->format <= VIR_STORAGE_FILE_AUTO) {
virReportError(VIR_ERR_CONFIG_UNSUPPORTED,
_("shared access for disk '%s' requires use of "
"explicitly specified disk format"), disk->dst);
return -1;
}
if (!qemuBlockStorageSourceSupportsConcurrentAccess(disk->src)) {
virReportError(VIR_ERR_CONFIG_UNSUPPORTED,
_("shared access for disk '%s' requires use of "
"supported storage format"), disk->dst);
return -1;
}
}
return 0;
}
static int
qemuDomainDeviceDefValidate(const virDomainDeviceDef *dev,
const virDomainDef *def,
@ -3765,6 +3789,9 @@ qemuDomainDeviceDefValidate(const virDomainDeviceDef *dev,
break;
case VIR_DOMAIN_DEVICE_DISK:
ret = qemuDomainDeviceDefValidateDisk(dev->data.disk);
break;
case VIR_DOMAIN_DEVICE_LEASE:
case VIR_DOMAIN_DEVICE_FS:
case VIR_DOMAIN_DEVICE_INPUT:

28
tests/qemuxml2argvdata/qemuxml2argv-disk-drive-shared-qcow.xml Normal file
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@ -0,0 +1,28 @@
<domain type='qemu'>
<name>QEMUGuest1</name>
<uuid>c7a5fdbd-edaf-9455-926a-d65c16db1809</uuid>
<memory unit='KiB'>219136</memory>
<currentMemory unit='KiB'>219136</currentMemory>
<vcpu placement='static'>1</vcpu>
<os>
<type arch='i686' machine='pc'>hvm</type>
<boot dev='hd'/>
</os>
<clock offset='utc'/>
<on_poweroff>destroy</on_poweroff>
<on_reboot>restart</on_reboot>
<on_crash>destroy</on_crash>
<devices>
<emulator>/usr/bin/qemu-system-i686</emulator>
<disk type='block' device='disk'>
<driver name='qemu' type='qcow2'/>
<source dev='/dev/HostVG/QEMUGuest1'/>
<target dev='hda' bus='ide'/>
<shareable/>
<address type='drive' controller='0' bus='0' target='0' unit='0'/>
</disk>
<controller type='usb' index='0'/>
<controller type='ide' index='0'/>
<memballoon model='virtio'/>
</devices>
</domain>

2
tests/qemuxml2argvdata/qemuxml2argv-disk-drive-shared.args
View File

@ -19,7 +19,7 @@ server,nowait \
-no-acpi \
-boot c \
-usb \
-drive file=/dev/HostVG/QEMUGuest1,format=qcow2,if=none,id=drive-ide0-0-0,\
-drive file=/dev/HostVG/QEMUGuest1,format=raw,if=none,id=drive-ide0-0-0,\
serial=XYZXYZXYZYXXYZYZYXYZY,cache=none \
-device ide-drive,bus=ide.0,unit=0,drive=drive-ide0-0-0,id=ide0-0-0 \
-drive file=/dev/HostVG/QEMUGuest2,format=raw,if=none,id=drive-ide0-1-0,\

2
tests/qemuxml2argvdata/qemuxml2argv-disk-drive-shared.xml
View File

@ -15,7 +15,7 @@
<devices>
<emulator>/usr/bin/qemu-system-i686</emulator>
<disk type='block' device='disk'>
<driver name='qemu' type='qcow2'/>
<driver name='qemu' type='raw'/>
<source dev='/dev/HostVG/QEMUGuest1'/>
<target dev='hda' bus='ide'/>
<shareable/>

1
tests/qemuxml2argvtest.c
View File

@ -908,6 +908,7 @@ mymain(void)
QEMU_CAPS_DRIVE_BOOT);
DO_TEST("disk-drive-shared",
QEMU_CAPS_DRIVE_SERIAL);
DO_TEST_PARSE_ERROR("disk-drive-shared-qcow", NONE);
DO_TEST("disk-drive-error-policy-stop",
QEMU_CAPS_MONITOR_JSON);
DO_TEST("disk-drive-error-policy-enospace",