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adding Irix (and, to a lesser extent, Solaris) userland emulation to QEMU
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Paolo Bonzini c8adc0db7e virtio-blk: do not relay a previous driver's WCE configuration to the current 
The following sequence happens:
- the SeaBIOS virtio-blk driver does not support the WCE feature, which
causes QEMU to disable writeback caching

- the Linux virtio-blk driver resets the device, finds WCE is available
but writeback caching is disabled; tells block layer to not send cache
flush commands

- the Linux virtio-blk driver sets the DRIVER_OK bit, which causes
writeback caching to be re-enabled, but the Linux virtio-blk driver does
not know of this side effect and cache flushes remain disabled

The bug is at the third step.  If the guest does know about CONFIG_WCE,
QEMU should ignore the WCE feature's state.  The guest will control the
cache mode solely using configuration space.  This change makes Linux
do flushes correctly, but Linux will keep SeaBIOS's writethrough mode.

Hence, whenever the guest is reset, the cache mode of the disk should
be reset to whatever was specified in the "-drive" option.  With this
change, the Linux virtio-blk driver finds that writeback caching is
enabled, and tells the block layer to send cache flush commands
appropriately.

Reported-by: Rusty Russell <rusty@au1.ibm.com
Cc: qemu-stable@nongnu.org
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
(cherry picked from commit ef5bc96268)

Signed-off-by: Michael Roth <mdroth@linux.vnet.ibm.com>
 		2013-09-24 23:03:09 -05:00
QMP net: add support of mac-programming over macvtap in QEMU side 2013-07-15 21:23:08 +03:00
audio audio: Replace static functions in header file by macros, remove GCC_ATTR 2013-06-21 22:52:50 +04:00
backends rng-random: use error_setg_file_open() 2013-06-17 11:01:14 -04:00
block w32: Fix access to host devices (regression) 2013-09-24 22:30:07 -05:00
bsd-user gdbstub: Change gdb_handlesig() argument to CPUState 2013-07-23 02:41:33 +02:00
default-configs mips_malta: do not raise exceptions when accessing invalid memory 2013-08-14 16:47:30 +02:00
disas tcg-arm: Implement division instructions 2013-04-27 02:16:44 +02:00
docs misc: Fix new typos in comments and strings 2013-07-27 11:22:54 +04:00
dtc@bc895d6d09 dtc: add submodule 2013-04-18 13:50:53 +02:00
fpu softfloat: Fix shift128Right for shift counts 64..127 2013-06-10 11:36:12 -05:00
fsdev fsdev: Fix potential memory leak 2013-07-09 13:38:56 -05:00
gdb-xml
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hw virtio-blk: do not relay a previous driver's WCE configuration to the current 2013-09-24 23:03:09 -05:00
include virtio-blk: do not relay a previous driver's WCE configuration to the current 2013-09-24 23:03:09 -05:00
libcacard libcacard: Fix cppcheck warning and remove unneeded code 2013-06-21 22:52:50 +04:00
linux-headers linux-headers: Update to v3.10-rc5 2013-06-12 13:19:10 +04:00
linux-user linux-user: Return success from m68k set_thread_area syscall 2013-07-29 19:56:52 -05:00
net misc: Use g_assert_not_reached for code which is expected to be unreachable 2013-07-27 11:22:54 +04:00
pc-bios Update OpenBIOS images 2013-07-30 23:11:07 +01:00
pixman@97336fad32
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po po: Update all *.po files 2013-08-07 12:48:00 -05:00
qapi qapi: make visit_type_size fallback to type_int 2013-07-29 19:33:33 -05:00
qga qga: escape cmdline args when registering win32 service (CVE-2013-2231) 2013-07-25 14:49:04 -05:00
qobject Implement qdict_flatten() 2013-07-26 22:01:31 +02:00
qom gdbstub: Fix gdb_register_coprocessor() register counting 2013-09-24 17:12:22 -05:00
roms Update OpenBIOS images 2013-07-30 23:11:07 +01:00
scripts qapi-types.py: Fix enum struct sizes on i686 2013-09-24 22:50:13 -05:00
slirp slirp: remove mbuf(m_hdr,m_dat) indirection 2013-07-19 12:52:03 +04:00
stubs dump: rebase from host-private RAMBlock offsets to guest-physical addresses 2013-08-08 11:01:46 -04:00
sysconfigs/target
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target-alpha cpu: Partially revert "cpu: Change qemu_init_vcpu() argument to CPUState" 2013-07-29 15:29:15 +02:00
target-arm cpu: Partially revert "cpu: Change qemu_init_vcpu() argument to CPUState" 2013-07-29 15:29:15 +02:00
target-cris cpu: Partially revert "cpu: Change qemu_init_vcpu() argument to CPUState" 2013-07-29 15:29:15 +02:00
target-i386 target-i386: fix disassembly with PAE=1, PG=0 2013-09-24 22:05:30 -05:00
target-lm32 lm32_juart: Relocate and tidy header 2013-07-29 21:06:27 +02:00
target-m68k cpu: Partially revert "cpu: Change qemu_init_vcpu() argument to CPUState" 2013-07-29 15:29:15 +02:00
target-microblaze cpu: Partially revert "cpu: Change qemu_init_vcpu() argument to CPUState" 2013-07-29 15:29:15 +02:00
target-mips target-mips: fix decoding of microMIPS POOL32Axf instructions 2013-08-06 13:09:14 +02:00
target-moxie cpu: Partially revert "cpu: Change qemu_init_vcpu() argument to CPUState" 2013-07-29 15:29:15 +02:00
target-openrisc cpu: Partially revert "cpu: Change qemu_init_vcpu() argument to CPUState" 2013-07-29 15:29:15 +02:00
target-ppc target-ppc: fix bit extraction for FPBF and FPL 2013-09-24 18:46:32 -05:00
target-s390x dump: rebase from host-private RAMBlock offsets to guest-physical addresses 2013-08-08 11:01:46 -04:00
target-sh4 cpu: Partially revert "cpu: Change qemu_init_vcpu() argument to CPUState" 2013-07-29 15:29:15 +02:00
target-sparc cpu: Partially revert "cpu: Change qemu_init_vcpu() argument to CPUState" 2013-07-29 15:29:15 +02:00
target-unicore32 cpu: Partially revert "cpu: Change qemu_init_vcpu() argument to CPUState" 2013-07-29 15:29:15 +02:00
target-xtensa xtensa queue 2013-07-29 2013-08-05 08:06:25 -05:00
tcg tcg/mips: fix invalid op definition errors 2013-08-08 23:06:02 +02:00
tests vmdk: check l1 size before opening image 2013-08-06 15:27:32 +02:00
trace trace: Add ftrace tracing backend 2013-05-03 13:58:09 +02:00
ui spice: fix display initialization 2013-07-30 10:25:47 +02:00
util qemu-option: Guard against qemu_opts_set_defaults() misuse 2013-08-12 09:15:37 -05:00
.exrc
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.gitignore gitignore: unignore *.patch 2013-06-11 23:45:43 +04:00
.gitmodules pc-bios: Update palcode-clipper 2013-07-18 08:17:42 -07:00
.mailmap
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CODING_STYLE
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COPYING
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COPYING.LIB
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Changelog
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HACKING HACKING: Document vaddr type usage 2013-07-23 02:41:31 +02:00
LICENSE LICENSE: clarify 2013-08-12 09:15:12 -05:00
MAINTAINERS MAINTAINERS: change Igor Mitsyanko's email address 2013-07-31 13:28:46 -05:00
Makefile w32: Add missing version.o to all executables (fix regression) 2013-08-12 09:19:05 -05:00
Makefile.objs w32: Add missing version.o to all executables (fix regression) 2013-08-12 09:19:05 -05:00
Makefile.target build: do not use TARGET_ARCH 2013-06-14 15:33:10 +01:00
README
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VERSION Update version for 1.6.0 2013-08-15 13:41:43 -05:00
aio-posix.c aio: support G_IO_HUP and G_IO_ERR 2013-02-21 16:17:31 -06:00
aio-win32.c
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arch_init.c rdma: send pc.ram 2013-07-23 11:12:00 +02:00
async.c QEMUBH: make AioContext's bh re-entrant 2013-07-19 12:29:21 +08:00
balloon.c
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block-migration.c block-migration: efficiently encode zero blocks 2013-07-19 12:29:21 +08:00
block.c block: expect errors from bdrv_co_is_allocated 2013-09-24 20:59:51 -05:00
blockdev-nbd.c hw: move headers to include/ 2013-04-08 18:13:10 +02:00
blockdev.c blockdev: do not default cache.no-flush to true 2013-09-24 23:02:51 -05:00
blockjob.c
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bt-host.c sysemu: avoid proliferation of include/ subdirectories 2013-04-15 18:19:25 +02:00
bt-vhci.c sysemu: avoid proliferation of include/ subdirectories 2013-04-15 18:19:25 +02:00
configure xtensa queue 2013-07-29 2013-08-05 08:06:25 -05:00
coroutine-gthread.c
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coroutine-sigaltstack.c Merge remote-tracking branch 'kwolf/for-anthony' into staging 2013-02-26 07:44:39 -06:00
coroutine-ucontext.c Fix warnings suppressors to honor --disable-werror 2013-04-17 10:28:04 -05:00
coroutine-win32.c
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cpu-exec.c cpu: Move singlestep_enabled field from CPU_COMMON to CPUState 2013-07-23 02:41:32 +02:00
cpus.c timer: make timers_state static 2013-07-27 11:22:53 +04:00
cputlb.c cpu: Make first_cpu and next_cpu CPUState 2013-07-09 21:32:54 +02:00
device-hotplug.c hw: move device-hotplug.o to toplevel, compile it once 2013-03-01 13:57:13 +01:00
device_tree.c device_tree: Add qemu_devtree_setprop_sized_cells() utility functions 2013-07-19 12:58:46 +01:00
disas.c exec: Change cpu_memory_rw_debug() argument to CPUState 2013-07-23 02:41:33 +02:00
dma-helpers.c dma: keep a device alive while it has SGLists 2013-07-04 17:42:30 +02:00
dump.c dump: rebase from host-private RAMBlock offsets to guest-physical addresses 2013-08-08 11:01:46 -04:00
exec.c exec: check offset_within_address_space for register subpage 2013-09-24 22:37:49 -05:00
gdbstub.c gdbstub: Fix gdb_register_coprocessor() register counting 2013-09-24 17:12:22 -05:00
hmp-commands.hx block: add drive_backup HMP command 2013-07-15 09:49:00 +02:00
hmp.c rdma: account for the time spent in MIG_STATE_SETUP through QMP 2013-07-23 13:06:37 +02:00
hmp.h block: add drive_backup HMP command 2013-07-15 09:49:00 +02:00
iohandler.c
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ioport.c memory: Provide separate handling of unassigned io ports accesses 2013-09-24 22:31:12 -05:00
kvm-all.c kvm: Change prototype of kvm_update_guest_debug() 2013-07-26 23:05:31 +02:00
kvm-stub.c kvm: Change prototype of kvm_update_guest_debug() 2013-07-26 23:05:31 +02:00
main-loop.c main-loop: do not include slirp/slirp.h, use libslirp.h instead 2013-06-12 18:43:08 +04:00
memory.c Revert "memory: Return -1 again on reads from unsigned regions" 2013-09-24 22:31:53 -05:00
memory_mapping.c dump: rebase from host-private RAMBlock offsets to guest-physical addresses 2013-08-08 11:01:46 -04:00
migration-exec.c migration: eliminate s->migration_file 2013-03-11 13:32:03 +01:00
migration-fd.c migration: eliminate s->migration_file 2013-03-11 13:32:03 +01:00
migration-rdma.c rdma: silly ipv6 bugfix 2013-09-24 18:54:58 -05:00
migration-tcp.c migration: eliminate s->migration_file 2013-03-11 13:32:03 +01:00
migration-unix.c migration: eliminate s->migration_file 2013-03-11 13:32:03 +01:00
migration.c migration: don't use uninitialized variables 2013-08-01 09:40:46 -04:00
monitor.c exec: Change cpu_memory_rw_debug() argument to CPUState 2013-07-23 02:41:33 +02:00
nbd.c nbd: support large NBD requests 2013-05-03 13:05:49 +02:00
os-posix.c Add option to mlock qemu and guest memory 2013-04-22 08:52:23 -05:00
os-win32.c qemu-timer: move timeBeginPeriod/timeEndPeriod to os-win32 2013-04-12 18:27:16 +02:00
page_cache.c remove some double-includes 2013-05-18 16:35:12 +04:00
qapi-schema.json qapi: Rename ChardevBackend member "memory" to "ringbuf" 2013-07-29 10:37:12 -05:00
qdev-monitor.c qemu-help: Sort devices by logical functionality 2013-07-29 10:37:09 -05:00
qdict-test-data.txt
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qemu-bridge-helper.c qemu-bridge-helper: force usage of a very high MAC address for the bridge 2013-03-28 12:58:52 -05:00
qemu-char.c chardev: fix pty_chr_timer 2013-09-24 22:52:23 -05:00
qemu-coroutine-io.c rdma: export yield_until_fd_readable() 2013-06-27 02:38:36 +02:00
qemu-coroutine-lock.c block: Repair the throttling code. 2013-07-29 17:07:37 +02:00
qemu-coroutine-sleep.c
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qemu-coroutine.c coroutine: stop using AioContext in CoQueue 2013-05-24 16:17:56 +02:00
qemu-doc.texi doc: we use seabios, not bochs bios 2013-06-28 22:10:34 +04:00
qemu-img-cmds.hx qemu-img: Add compare subcommand 2013-02-22 21:21:10 +01:00
qemu-img.c block: expect errors from bdrv_co_is_allocated 2013-09-24 20:59:51 -05:00
qemu-img.texi qemu-img: Add compare subcommand 2013-02-22 21:21:10 +01:00
qemu-io-cmds.c block: expect errors from bdrv_co_is_allocated 2013-09-24 20:59:51 -05:00
qemu-io.c ignore SIGPIPE in qemu-img and qemu-io 2013-08-06 10:41:56 +02:00
qemu-log.c qemu-log: default to stderr for logging output 2013-02-26 13:31:47 -06:00
qemu-nbd.c Add -f FMT / --format FMT arg to qemu-nbd 2013-04-15 14:29:20 -05:00
qemu-nbd.texi Add -f FMT / --format FMT arg to qemu-nbd 2013-04-15 14:29:20 -05:00
qemu-options-wrapper.h
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qemu-options.h
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qemu-options.hx Revert "chardev: Make the name of memory device consistent" 2013-07-29 10:37:11 -05:00
qemu-seccomp.c seccomp: add arch_prctl() to the syscall whitelist 2013-07-29 19:56:52 -05:00
qemu-tech.texi
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qemu-timer.c qemu-timer: move timeBeginPeriod/timeEndPeriod to os-win32 2013-04-12 18:27:16 +02:00
qemu.nsi w32, w64: Add build rule for installer 2013-07-29 11:43:37 +02:00
qemu.sasl Fix command example in qemu.sasl 2013-07-19 12:52:03 +04:00
qmp-commands.hx rdma: remaining documentation fixes 2013-08-12 09:31:16 -05:00
qmp.c QMP: Add cpu-add command 2013-05-01 13:06:07 +02:00
qtest.c qtest: Don't reset on qtest chardev connect 2013-07-18 13:27:46 -05:00
readline.c readline: Handle xterm escape sequences for Home/End keys 2013-05-14 08:53:22 -05:00
rules.mak win32: fix compilation again 2013-05-03 12:04:40 -05:00
savevm.c rdma: bugfix: ram_control_save_page() 2013-07-23 11:11:59 +02:00
spice-qemu-char.c qemu-char: don't issue CHR_EVENT_OPEN in a BH 2013-06-10 11:38:37 -05:00
tcg-runtime.c tcg: Implement multiword multiply helpers 2013-02-23 17:25:28 +00:00
tci.c tci: Fix qemu-alpha on 32 bit hosts (wrong assertions) 2013-09-24 22:56:25 -05:00
thread-pool.c threadpool: drop global thread pool 2013-03-15 16:07:51 +01:00
thunk.c
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tpm.c tpm.c: Don't try to put -1 in a variable of type TpmModel 2013-07-29 10:37:10 -05:00
trace-events memory: add tracepoints for MMIO reads/writes 2013-07-29 10:37:10 -05:00
translate-all.c linux-user: Unlock mmap_lock when resuming guest from page_unprotect 2013-07-23 17:28:28 +03:00
translate-all.h
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user-exec.c linux-user: fix segmentation fault passing with h2g(x) != x 2013-07-23 17:28:28 +03:00
version.rc
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vl.c spice: fix display initialization 2013-07-30 10:25:47 +02:00
xbzrle.c
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xen-all.c pc: Initializing ram_memory under Xen. 2013-09-24 22:47:03 -05:00
xen-mapcache.c hw: move headers to include/ 2013-04-08 18:13:10 +02:00
xen-stub.c pc: Initializing ram_memory under Xen. 2013-09-24 22:47:03 -05:00

README 

Read the documentation in qemu-doc.html or on http://wiki.qemu.org

- QEMU team