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scsi: build qemu-pr-helper

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Introduce a privileged helper to run persistent reservation commands.
This lets virtual machines send persistent reservations without using
CAP_SYS_RAWIO or out-of-tree patches.  The helper uses Unix permissions
and SCM_RIGHTS to restrict access to processes that can access its socket
and prove that they have an open file descriptor for a raw SCSI device.

The next patch will also correct the usage of persistent reservations
with multipath devices.

It would also be possible to support for Linux's IOC_PR_* ioctls in
the future, to support NVMe devices.  For now, however, only SCSI is
supported.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Paolo Bonzini 2017-08-22 06:50:18 +02:00
parent 7c9e527659
commit b855f8d175
6 changed files with 905 additions and 5 deletions
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14
configure vendored
View file

@ -5034,16 +5034,22 @@ if test "$want_tools" = "yes" ; then
fi
fi
if test "$softmmu" = yes ; then
if test "$virtfs" != no ; then
if test "$cap" = yes && test "$linux" = yes && test "$attr" = yes ; then
if test "$linux" = yes; then
if test "$virtfs" != no && test "$cap" = yes && test "$attr" = yes ; then
virtfs=yes
tools="$tools fsdev/virtfs-proxy-helper\$(EXESUF)"
else
if test "$virtfs" = yes; then
error_exit "VirtFS is supported only on Linux and requires libcap devel and libattr devel"
error_exit "VirtFS requires libcap devel and libattr devel"
fi
virtfs=no
fi
tools="$tools scsi/qemu-pr-helper\$(EXESUF)"
else
if test "$virtfs" = yes; then
error_exit "VirtFS is supported only on Linux"
fi
virtfs=no
fi
fi
@ -6506,7 +6512,7 @@ fi
# build tree in object directory in case the source is not in the current directory
DIRS="tests tests/tcg tests/tcg/cris tests/tcg/lm32 tests/libqos tests/qapi-schema tests/tcg/xtensa tests/qemu-iotests"
DIRS="$DIRS docs docs/interop fsdev"
DIRS="$DIRS docs docs/interop fsdev scsi"
DIRS="$DIRS pc-bios/optionrom pc-bios/spapr-rtas pc-bios/s390-ccw"
DIRS="$DIRS roms/seabios roms/vgabios"
DIRS="$DIRS qapi-generated"