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2011-10-24kvm: avoid reentring kvm_flush_coalesced_mmio_buffer()Avi Kivity
mmio callbacks invoked by kvm_flush_coalesced_mmio_buffer() may themselves indirectly call kvm_flush_coalesced_mmio_buffer(). Prevent reentering the function by checking a flag that indicates we're processing coalesced mmio requests. Signed-off-by: Avi Kivity <avi@redhat.com>
2011-10-04RunState: Rename enum values as generated by the QAPILuiz Capitulino
Next commit will convert the query-status command to use the RunState type as generated by the QAPI. In order to "transparently" replace the current enum by the QAPI one, we have to make some changes to some enum values. As the changes are simple renames, I'll do them in one shot. The changes are: - Rename the prefix from RSTATE_ to RUN_STATE_ - RUN_STATE_SAVEVM to RUN_STATE_SAVE_VM - RUN_STATE_IN_MIGRATE to RUN_STATE_INMIGRATE - RUN_STATE_PANICKED to RUN_STATE_INTERNAL_ERROR - RUN_STATE_POST_MIGRATE to RUN_STATE_POSTMIGRATE - RUN_STATE_PRE_LAUNCH to RUN_STATE_PRELAUNCH - RUN_STATE_PRE_MIGRATE to RUN_STATE_PREMIGRATE - RUN_STATE_RESTORE to RUN_STATE_RESTORE_VM - RUN_STATE_PRE_MIGRATE to RUN_STATE_FINISH_MIGRATE Signed-off-by: Luiz Capitulino <lcapitulino@redhat.com>
2011-09-15Replace the VMSTOP macros with a proper state typeLuiz Capitulino
Today, when notifying a VM state change with vm_state_notify(), we pass a VMSTOP macro as the 'reason' argument. This is not ideal because the VMSTOP macros tell why qemu stopped and not exactly what the current VM state is. One example to demonstrate this problem is that vm_start() calls vm_state_notify() with reason=0, which turns out to be VMSTOP_USER. This commit fixes that by replacing the VMSTOP macros with a proper state type called RunState. Signed-off-by: Luiz Capitulino <lcapitulino@redhat.com>
2011-09-02main: force enabling of I/O threadAnthony Liguori
Enabling the I/O thread by default seems like an important part of declaring 1.0. Besides allowing true SMP support with KVM, the I/O thread means that the TCG VCPU doesn't have to multiplex itself with the I/O dispatch routines which currently requires a (racey) signal based alarm system. I know there have been concerns about performance. I think so far the ones that have come up (virtio-net) are most likely due to secondary reasons like decreased batching. I think we ought to force enabling I/O thread early in 1.0 development and commit to resolving any lingering issues. Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
2011-08-20Use glib memory allocation and free functionsAnthony Liguori
qemu_malloc/qemu_free no longer exist after this commit. Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
2011-08-05kvm: Drop obsolete KVM_IOEVENTFD #ifdefsJan Kiszka
Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com> Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
2011-06-20kvm: Drop KVM_CAP build dependenciesJan Kiszka
No longer needed with accompanied kernel headers. We are only left with build dependencies that are controlled by kvm arch headers. CC: Alexander Graf <agraf@suse.de> Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com> Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
2011-06-20kvm: Drop useless zero-initializationsJan Kiszka
Backing KVMState is alreay zero-initialized. Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com> Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
2011-05-09kvm: ppc: warn user on PAGE_SIZE mismatchAlexander Graf
On PPC, the default PAGE_SIZE is 64kb. Unfortunately, the hardware alignments don't match here: There are RAM and MMIO regions within a single page when it's 64kb in size. So the only way out for now is to tell the user that he should use 4k PAGE_SIZE. This patch gives the user a hint on that, telling him that failing to register a prefix slot is most likely to be caused by mismatching PAGE_SIZE. This way it's also more future-proof, as bigger PAGE_SIZE can easily be supported by other machines then, as long as they stick to 64kb granularities. Signed-off-by: Alexander Graf <agraf@suse.de>
2011-05-05Merge remote branch 'origin/master' into pciMichael S. Tsirkin
Conflicts: exec.c
2011-05-02kvm: use qemu_free consistentlyPaolo Bonzini
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
2011-05-02fix crash in migration, 32-bit userspace on 64-bit hostMichael Tokarev
This change fixes a long-standing immediate crash (memory corruption and abort in glibc malloc code) in migration on 32bits. The bug is present since this commit: commit 692d9aca97b865b0f7903565274a52606910f129 Author: Bruce Rogers <brogers@novell.com> Date: Wed Sep 23 16:13:18 2009 -0600 qemu-kvm: allocate correct size for dirty bitmap The dirty bitmap copied out to userspace is stored in a long array, and gets copied out to userspace accordingly. This patch accounts for that correctly. Currently I'm seeing kvm crashing due to writing beyond the end of the alloc'd dirty bitmap memory, because the buffer has the wrong size. Signed-off-by: Bruce Rogers Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com> --- a/qemu-kvm.c +++ b/qemu-kvm.c @@ int kvm_get_dirty_pages_range(kvm_context_t kvm, unsigned long phys_addr, - buf = qemu_malloc((slots[i].len / 4096 + 7) / 8 + 2); + buf = qemu_malloc(BITMAP_SIZE(slots[i].len)); r = kvm_get_map(kvm, KVM_GET_DIRTY_LOG, i, buf); BITMAP_SIZE is now open-coded in that function, like this: size = ALIGN(((mem->memory_size) >> TARGET_PAGE_BITS), HOST_LONG_BITS) / 8; The problem is that HOST_LONG_BITS in 32bit userspace is 32 but it's 64 in 64bit kernel. So userspace aligns this to 32, and kernel to 64, but since no length is passed from userspace to kernel on ioctl, kernel uses its size calculation and copies 4 extra bytes to userspace, corrupting memory. Here's how it looks like during migrate execution: our=20, kern=24 our=4, kern=8 ... our=4, kern=8 our=4064, kern=4064 our=512, kern=512 our=4, kern=8 our=20, kern=24 our=4, kern=8 ... our=4, kern=8 our=4064, kern=4064 *** glibc detected *** ./x86_64-softmmu/qemu-system-x86_64: realloc(): invalid next size: 0x08f20528 *** (our is userspace size above, kern is the size as calculated by the kernel). Fix this by always aligning to 64 in a hope that no platform will have sizeof(long)>8 any time soon, and add a comment describing it all. It's a small price to pay for bad kernel design. Alternatively it's possible to fix that in the kernel by using different size calculation depending on the current process. But this becomes quite ugly. Special thanks goes to Stefan Hajnoczi for spotting the fundamental cause of the issue, and to Alexander Graf for his support in #qemu. Signed-off-by: Michael Tokarev <mjt@tls.msk.ru> CC: Bruce Rogers <brogers@novell.com> Signed-off-by: Avi Kivity <avi@redhat.com>
2011-05-02kvm: Install specialized interrupt handlerJan Kiszka
KVM only requires to set the raised IRQ in CPUState and to kick the receiving vcpu if it is remote. Installing a specialized handler allows potential future changes to the TCG code path without risking KVM side effects. Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com> Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
2011-04-06kvm: halve number of set memory calls for vgaMichael S. Tsirkin
use the new api to reduce the number of these (expensive) system calls. Note: using this API, we should be able to get rid of vga_dirty_log_xxx APIs. Using them doesn't affect the performance though because we detects the log_dirty flag set and ignores the call. Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
2011-04-06cpu: add set_memory flag to request dirty loggingMichael S. Tsirkin
Pass the flag to all cpu notifiers, doing nothing at this point. Will be used by follow-up patches. Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
2011-03-16kvm: x86: Push kvm_arch_debug to kvm_arch_handle_exitJan Kiszka
There are no generic bits remaining in the handling of KVM_EXIT_DEBUG. So push its logic completely into arch hands, i.e. only x86 so far. Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com> Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
2011-03-16kvm: Align kvm_arch_handle_exit to kvm_cpu_exec changesJan Kiszka
Make the return code of kvm_arch_handle_exit directly usable for kvm_cpu_exec. This is straightforward for x86 and ppc, just s390 would require more work. Avoid this for now by pushing the return code translation logic into s390's kvm_arch_handle_exit. Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com> CC: Alexander Graf <agraf@suse.de> Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
2011-03-16kvm: Rework inner loop of kvm_cpu_execJan Kiszka
Let kvm_cpu_exec return EXCP_* values consistently and generate those codes already inside its inner loop. This means we will now re-enter the kernel while ret == 0. Update kvm_handle_internal_error accordingly, but keep kvm_arch_handle_exit untouched, it will be converted in a separate step. Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com> Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
2011-03-16kvm: Reorder error handling of KVM_RUNJan Kiszka
Test for general errors first as this is the slower path. Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com> Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
2011-03-16kvm: Keep KVM_RUN return value in separate variableJan Kiszka
Avoid using 'ret' both for the return value of KVM_RUN as well as the code kvm_cpu_exec is supposed to return. Both have no direct relation. Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com> Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
2011-03-16kvm: Consider EXIT_DEBUG unknown without CAP_SET_GUEST_DEBUGJan Kiszka
Without KVM_CAP_SET_GUEST_DEBUG, we neither motivate the kernel to report KVM_EXIT_DEBUG nor do we expect such exits. So fall through to the arch code which will simply report an unknown exit reason. Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com> Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
2011-03-16kvm: Mark VCPU state dirty on creationJan Kiszka
This avoids that early cpu_synchronize_state calls try to retrieve an uninitialized state from the kernel. That even causes a deadlock if io-thread is enabled. Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com> Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
2011-03-15kvm: Rename kvm_arch_process_irqchip_events to async_eventsJan Kiszka
We will broaden the scope of this function on x86 beyond irqchip events. Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com> Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
2011-03-15kvm: Fix build warning when KVM_CAP_SET_GUEST_DEBUG is lackingJan Kiszka
Original fix by David Gibson. CC: David Gibson <david@gibson.dropbear.id.au> Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com> Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
2011-02-14kvm: Make kvm_state globally availableJan Kiszka
KVM-assisted devices need access to it but we have no clean channel to distribute a reference. As a workaround until there is a better solution, export kvm_state for global use, though use should remain restricted to the mentioned scenario. Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com> Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
2011-02-14Introduce log_start/log_stop in CPUPhysMemoryClientAnthony PERARD
In order to use log_start/log_stop with Xen as well in the vga code, this two operations have been put in CPUPhysMemoryClient. The two new functions cpu_physical_log_start,cpu_physical_log_stop are used in hw/vga.c and replace the kvm_log_start/stop. With this, vga does no longer depends on kvm header. [ Jan: rebasing and style fixlets ] Signed-off-by: Anthony PERARD <anthony.perard@citrix.com> Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com> Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
2011-02-14kvm: Remove unneeded memory slot reservationJan Kiszka
The number of slots and the location of private ones changed several times in KVM's early days. However, it's stable since 2.6.29 (our required baseline), and slots 8..11 are no longer reserved since then. So remove this unneeded restriction. Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com> CC: Alex Williamson <alex.williamson@redhat.com> Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
2011-02-14kvm: Separate TCG from KVM cpu executionJan Kiszka
Mixing up TCG bits with KVM already led to problems around eflags emulation on x86. Moreover, quite some code that TCG requires on cpu enty/exit is useless for KVM. So dispatch between tcg_cpu_exec and kvm_cpu_exec as early as possible. The core logic of cpu_halted from cpu_exec is added to kvm_arch_process_irqchip_events. Moving away from cpu_exec makes exception_index meaningless for KVM, we can simply pass the exit reason directly (only "EXCP_DEBUG vs. rest" is relevant). Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com> Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
2011-02-14Improve vm_stop reason declarationsJan Kiszka
Define and use dedicated constants for vm_stop reasons, they actually have nothing to do with the EXCP_* defines used so far. At this chance, specify more detailed reasons so that VM state change handlers can evaluate them. Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com> Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
2011-02-14kvm: Leave kvm_cpu_exec directly after KVM_EXIT_SHUTDOWNJan Kiszka
The reset we issue on KVM_EXIT_SHUTDOWN implies that we should also leave the VCPU loop. As we now check for exit_request which is set by qemu_system_reset_request, this bug is no longer critical. Still it's an unneeded extra turn. Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com> Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
2011-02-14kvm: Remove static return code of kvm_handle_ioJan Kiszka
Improve the readability of the exit dispatcher by moving the static return value of kvm_handle_io to its caller. Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com> Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
2011-02-14kvm: Unconditionally reenter kernel after IO exitsJan Kiszka
KVM requires to reenter the kernel after IO exits in order to complete instruction emulation. Failing to do so will leave the kernel state inconsistently behind. To ensure that we will get back ASAP, we issue a self-signal that will cause KVM_RUN to return once the pending operations are completed. We can move kvm_arch_process_irqchip_events out of the inner VCPU loop. The only state that mattered at its old place was a pending INIT request. Catch it in kvm_arch_pre_run and also trigger a self-signal to process the request on next kvm_cpu_exec. This patch also fixes the missing exit_request check in kvm_cpu_exec in the CONFIG_IOTHREAD case. Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com> CC: Gleb Natapov <gleb@redhat.com> Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
2011-02-14kvm: Provide sigbus services arch-independentlyJan Kiszka
Provide arch-independent kvm_on_sigbus* stubs to remove the #ifdef'ery from cpus.c. This patch also fixes --disable-kvm build by providing the missing kvm_on_sigbus_vcpu kvm-stub. Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com> Reviewed-by: Paolo Bonzini <pbonzini@redhat.com> Acked-by: Alexander Graf <agraf@suse.de> Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
2011-02-14kvm: Report proper error on GET_VCPU_MMAP_SIZE failuresJan Kiszka
Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com> Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
2011-02-01Merge remote branch 'qemu-kvm/uq/master' into stagingAnthony Liguori
aliguori: fix build with !defined(KVM_CAP_ASYNC_PF) Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
2011-01-31virtio-pci: Disable virtio-ioeventfd when !CONFIG_IOTHREADStefan Hajnoczi
It is not possible to use virtio-ioeventfd when building without an I/O thread. We rely on a signal to kick us out of vcpu execution. Timers and AIO use SIGALRM and SIGUSR2 respectively. Unfortunately eventfd does not support O_ASYNC (SIGIO) so eventfd cannot be used in a signal driven manner. Signed-off-by: Stefan Hajnoczi <stefanha@linux.vnet.ibm.com> Acked-by: Michael S. Tsirkin <mst@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2011-01-23kvm: Flush coalesced mmio buffer on IO window exitsJan Kiszka
We must flush pending mmio writes if we leave kvm_cpu_exec for an IO window. Otherwise we risk to loose those requests when migrating to a different host during that window. Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com> Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
2011-01-23kvm: Consolidate must-have capability checksJan Kiszka
Instead of splattering the code with #ifdefs and runtime checks for capabilities we cannot work without anyway, provide central test infrastructure for verifying their availability both at build and runtime. Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com> Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
2011-01-23kvm: Drop smp_cpus argument from init functionsJan Kiszka
No longer used. Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com> Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
2011-01-23x86: Optionally dump code bytes on cpu_dump_stateJan Kiszka
Introduce the cpu_dump_state flag CPU_DUMP_CODE and implement it for x86. This writes out the code bytes around the current instruction pointer. Make use of this feature in KVM to help debugging fatal vm exits. Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com> Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
2011-01-23kvm: Improve reporting of fatal errorsJan Kiszka
Report KVM_EXIT_UNKNOWN, KVM_EXIT_FAIL_ENTRY, and KVM_EXIT_EXCEPTION with more details to stderr. The latter two are so far x86-only, so move them into the arch-specific handler. Integrate the Intel real mode warning on KVM_EXIT_FAIL_ENTRY that qemu-kvm carries, but actually restrict it to Intel CPUs. Moreover, always dump the CPU state in case we fail. Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com> Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
2011-01-23kvm: Stop on all fatal exit reasonsJan Kiszka
Ensure that we stop the guest whenever we face a fatal or unknown exit reason. If we stop, we also have to enforce a cpu loop exit. Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com> Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
2011-01-21kvm: Fix coding style violationsJan Kiszka
No functional changes. Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com> Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
2011-01-21kvm: convert kvm_ioctl(KVM_CHECK_EXTENSION) to kvm_check_extension()Lai Jiangshan
simple cleanup and use existing helper: kvm_check_extension(). Signed-off-by: Lai Jiangshan <laijs@cn.fujitsu.com> Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
2011-01-10kvm: test for ioeventfd support on old kernelsStefan Hajnoczi
There used to be a limit of 6 KVM io bus devices in the kernel. On such a kernel, we can't use many ioeventfds for host notification since the limit is reached too easily. Add an API to test for this condition. Signed-off-by: Stefan Hajnoczi <stefanha@linux.vnet.ibm.com> Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
2010-12-02migration: stable ram block orderingMichael S. Tsirkin
This makes ram block ordering under migration stable, ordered by offset. This is especially useful for migration to exec, for debugging. Signed-off-by: Michael S. Tsirkin <mst@redhat.com> Tested-by: Jason Wang <jasowang@redhat.com>
2010-10-20Add RAM -> physical addr mapping in MCE simulationHuang Ying
In QEMU-KVM, physical address != RAM address. While MCE simulation needs physical address instead of RAM address. So kvm_physical_memory_addr_from_ram() is implemented to do the conversion, and it is invoked before being filled in the IA32_MCi_ADDR MSR. Reported-by: Dean Nelson <dnelson@redhat.com> Signed-off-by: Huang Ying <ying.huang@intel.com> Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com> Signed-off-by: Avi Kivity <avi@redhat.com>
2010-09-25Introduce qemu_madvise()Andreas Färber
vl.c has a Sun-specific hack to supply a prototype for madvise(), but the call site has apparently moved to arch_init.c. Haiku doesn't implement madvise() in favor of posix_madvise(). OpenBSD and Solaris 10 don't implement posix_madvise() but madvise(). MinGW implements neither. Check for madvise() and posix_madvise() in configure and supply qemu_madvise() as wrapper. Prefer madvise() over posix_madvise() due to flag availability. Convert all callers to use qemu_madvise() and QEMU_MADV_*. Note that on Solaris the warning is fixed by moving the madvise() prototype, not by qemu_madvise() itself. It helps with porting though, and it simplifies most call sites. v7 -> v8: * Some versions of MinGW have no sys/mman.h header. Reported by Blue Swirl. v6 -> v7: * Adopt madvise() rather than posix_madvise() semantics for returning errors. * Use EINVAL in place of ENOTSUP. v5 -> v6: * Replace two leftover instances of POSIX_MADV_NORMAL with QEMU_MADV_INVALID. Spotted by Blue Swirl. v4 -> v5: * Introduce QEMU_MADV_INVALID, suggested by Alexander Graf. Note that this relies on -1 not being a valid advice value. v3 -> v4: * Eliminate #ifdefs at qemu_advise() call sites. Requested by Blue Swirl. This will currently break the check in kvm-all.c by calling madvise() with a supported flag, which will not fail. Ideas/patches welcome. v2 -> v3: * Reuse the *_MADV_* defines for QEMU_MADV_*. Suggested by Alexander Graf. * Add configure check for madvise(), too. Add defines to Makefile, not QEMU_CFLAGS. Convert all callers, untested. Suggested by Blue Swirl. * Keep Solaris' madvise() prototype around. Pointed out by Alexander Graf. * Display configure check results. v1 -> v2: * Don't rely on posix_madvise() availability, add qemu_madvise(). Suggested by Blue Swirl. Signed-off-by: Andreas Färber <afaerber@opensolaris.org> Cc: Blue Swirl <blauwirbel@gmail.com> Cc: Alexander Graf <agraf@suse.de> Cc: Andrea Arcangeli <aarcange@redhat.com> Signed-off-by: Blue Swirl <blauwirbel@gmail.com>
2010-08-23Merge remote branch 'qemu-kvm/uq/master' into stagingAnthony Liguori
2010-08-10Add function to assign ioeventfd to MMIO.Cam Macdonell
Signed-off-by: Cam Macdonell <cam@cs.ualberta.ca> Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
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