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7c9e527659
It is a common requirement for virtual machine to send persistent
reservations, but this currently requires either running QEMU with
CAP_SYS_RAWIO, or using out-of-tree patches that let an unprivileged
QEMU bypass Linux's filter on SG_IO commands.
As an alternative mechanism, the next patches will introduce a
privileged helper to run persistent reservation commands without
expanding QEMU's attack surface unnecessarily.
The helper is invoked through a "pr-manager" QOM object, to which
file-posix.c passes SG_IO requests for PERSISTENT RESERVE OUT and
PERSISTENT RESERVE IN commands. For example:
$ qemu-system-x86_64
-device virtio-scsi \
-object pr-manager-helper,id=helper0,path=/var/run/qemu-pr-helper.sock
-drive if=none,id=hd,driver=raw,file.filename=/dev/sdb,file.pr-manager=helper0
-device scsi-block,drive=hd
or:
$ qemu-system-x86_64
-device virtio-scsi \
-object pr-manager-helper,id=helper0,path=/var/run/qemu-pr-helper.sock
-blockdev node-name=hd,driver=raw,file.driver=host_device,file.filename=/dev/sdb,file.pr-manager=helper0
-device scsi-block,drive=hd
Multiple pr-manager implementations are conceivable and possible, though
only one is implemented right now. For example, a pr-manager could:
- talk directly to the multipath daemon from a privileged QEMU
(i.e. QEMU links to libmpathpersist); this makes reservation work
properly with multipath, but still requires CAP_SYS_RAWIO
- use the Linux IOC_PR_* ioctls (they require CAP_SYS_ADMIN though)
- more interestingly, implement reservations directly in QEMU
through file system locks or a shared database (e.g. sqlite)
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
183 lines
5.7 KiB
Makefile
183 lines
5.7 KiB
Makefile
#######################################################################
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# Common libraries for tools and emulators
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stub-obj-y = stubs/ crypto/
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util-obj-y = util/ qobject/ qapi/
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util-obj-y += qmp-introspect.o qapi-types.o qapi-visit.o qapi-event.o
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chardev-obj-y = chardev/
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#######################################################################
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# block-obj-y is code used by both qemu system emulation and qemu-img
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block-obj-y += nbd/
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block-obj-y += block.o blockjob.o
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block-obj-y += block/ scsi/
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block-obj-y += qemu-io-cmds.o
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block-obj-$(CONFIG_REPLICATION) += replication.o
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block-obj-m = block/
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#######################################################################
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# crypto-obj-y is code used by both qemu system emulation and qemu-img
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crypto-obj-y = crypto/
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crypto-aes-obj-y = crypto/
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#######################################################################
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# qom-obj-y is code used by both qemu system emulation and qemu-img
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qom-obj-y = qom/
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#######################################################################
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# io-obj-y is code used by both qemu system emulation and qemu-img
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io-obj-y = io/
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######################################################################
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# Target independent part of system emulation. The long term path is to
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# suppress *all* target specific code in case of system emulation, i.e. a
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# single QEMU executable should support all CPUs and machines.
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ifeq ($(CONFIG_SOFTMMU),y)
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common-obj-y = blockdev.o blockdev-nbd.o block/
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common-obj-y += bootdevice.o iothread.o
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common-obj-y += net/
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common-obj-y += qdev-monitor.o device-hotplug.o
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common-obj-$(CONFIG_WIN32) += os-win32.o
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common-obj-$(CONFIG_POSIX) += os-posix.o
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common-obj-$(CONFIG_LINUX) += fsdev/
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common-obj-y += migration/
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common-obj-y += audio/
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common-obj-y += hw/
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common-obj-y += replay/
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common-obj-y += ui/
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common-obj-y += bt-host.o bt-vhci.o
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bt-host.o-cflags := $(BLUEZ_CFLAGS)
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common-obj-y += dma-helpers.o
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common-obj-y += vl.o
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vl.o-cflags := $(GPROF_CFLAGS) $(SDL_CFLAGS)
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common-obj-y += tpm.o
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common-obj-$(CONFIG_SLIRP) += slirp/
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common-obj-y += backends/
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common-obj-y += chardev/
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common-obj-$(CONFIG_SECCOMP) += qemu-seccomp.o
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qemu-seccomp.o-cflags := $(SECCOMP_CFLAGS)
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qemu-seccomp.o-libs := $(SECCOMP_LIBS)
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common-obj-$(CONFIG_FDT) += device_tree.o
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######################################################################
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# qapi
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common-obj-y += qmp-marshal.o
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common-obj-y += qmp-introspect.o
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common-obj-y += qmp.o hmp.o
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endif
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#######################################################################
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# Target-independent parts used in system and user emulation
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common-obj-y += cpus-common.o
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common-obj-y += hw/
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common-obj-y += qom/
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common-obj-y += disas/
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######################################################################
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# Resource file for Windows executables
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version-obj-$(CONFIG_WIN32) += $(BUILD_DIR)/version.o
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######################################################################
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# tracing
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util-obj-y += trace/
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target-obj-y += trace/
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######################################################################
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# guest agent
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# FIXME: a few definitions from qapi-types.o/qapi-visit.o are needed
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# by libqemuutil.a. These should be moved to a separate .json schema.
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qga-obj-y = qga/
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qga-vss-dll-obj-y = qga/
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######################################################################
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# contrib
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ivshmem-client-obj-$(CONFIG_IVSHMEM) = contrib/ivshmem-client/
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ivshmem-server-obj-$(CONFIG_IVSHMEM) = contrib/ivshmem-server/
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libvhost-user-obj-y = contrib/libvhost-user/
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vhost-user-scsi.o-cflags := $(LIBISCSI_CFLAGS)
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vhost-user-scsi.o-libs := $(LIBISCSI_LIBS)
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vhost-user-scsi-obj-y = contrib/vhost-user-scsi/
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vhost-user-scsi-obj-y += contrib/libvhost-user/libvhost-user.o
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######################################################################
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trace-events-subdirs =
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trace-events-subdirs += util
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trace-events-subdirs += crypto
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trace-events-subdirs += io
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trace-events-subdirs += migration
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trace-events-subdirs += block
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trace-events-subdirs += chardev
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trace-events-subdirs += hw/block
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trace-events-subdirs += hw/block/dataplane
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trace-events-subdirs += hw/char
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trace-events-subdirs += hw/intc
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trace-events-subdirs += hw/net
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trace-events-subdirs += hw/virtio
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trace-events-subdirs += hw/audio
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trace-events-subdirs += hw/misc
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trace-events-subdirs += hw/usb
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trace-events-subdirs += hw/scsi
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trace-events-subdirs += hw/nvram
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trace-events-subdirs += hw/display
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trace-events-subdirs += hw/input
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trace-events-subdirs += hw/timer
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trace-events-subdirs += hw/dma
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trace-events-subdirs += hw/sparc
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trace-events-subdirs += hw/sd
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trace-events-subdirs += hw/isa
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trace-events-subdirs += hw/mem
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trace-events-subdirs += hw/i386
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trace-events-subdirs += hw/i386/xen
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trace-events-subdirs += hw/9pfs
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trace-events-subdirs += hw/ppc
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trace-events-subdirs += hw/pci
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trace-events-subdirs += hw/s390x
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trace-events-subdirs += hw/vfio
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trace-events-subdirs += hw/acpi
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trace-events-subdirs += hw/arm
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trace-events-subdirs += hw/alpha
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trace-events-subdirs += hw/xen
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trace-events-subdirs += hw/ide
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trace-events-subdirs += ui
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trace-events-subdirs += audio
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trace-events-subdirs += net
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trace-events-subdirs += target/arm
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trace-events-subdirs += target/i386
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trace-events-subdirs += target/mips
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trace-events-subdirs += target/sparc
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trace-events-subdirs += target/s390x
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trace-events-subdirs += target/ppc
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trace-events-subdirs += qom
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trace-events-subdirs += linux-user
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trace-events-subdirs += qapi
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trace-events-subdirs += accel/tcg
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trace-events-subdirs += accel/kvm
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trace-events-subdirs += nbd
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trace-events-subdirs += scsi
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trace-events-files = $(SRC_PATH)/trace-events $(trace-events-subdirs:%=$(SRC_PATH)/%/trace-events)
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trace-obj-y = trace-root.o
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trace-obj-y += $(trace-events-subdirs:%=%/trace.o)
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trace-obj-$(CONFIG_TRACE_UST) += trace-ust-all.o
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trace-obj-$(CONFIG_TRACE_DTRACE) += trace-dtrace-root.o
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trace-obj-$(CONFIG_TRACE_DTRACE) += $(trace-events-subdirs:%=%/trace-dtrace.o)
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