This file begins tracking the files that will be the code base for HVF
support in QEMU. This code base is part of Google's QEMU version of
their Android emulator, and can be found at
https://android.googlesource.com/platform/external/qemu/+/emu-master-dev

This code is based on Veertu Inc's vdhh (Veertu Desktop Hosted
Hypervisor), found at https://github.com/veertuinc/vdhh. Everything is
appropriately licensed under GPL v2-or-later, except for the code inside
x86_task.c and x86_task.h, which, deriving from KVM (the Linux kernel),
is licensed GPL v2-only.

This code base already implements a very great deal of functionality,
although Google's version removed from Vertuu's the support for APIC
page and hyperv-related stuff. According to the Android Emulator Release
Notes, Revision 26.1.3 (August 2017), "Hypervisor.framework is now
enabled by default on macOS for 32-bit x86 images to improve performance
and macOS compatibility", although we better use with caution for, as the
same Revision warns us, "If you experience issues with it specifically,
please file a bug report...". The code hasn't seen much update in the
last 5 months, so I think that we can further develop the code with
occasional visiting Google's repository to see if there has been any
update.

On top of Google's code, the following changes were made:

- add code to the configure script to support the --enable-hvf argument.
If the OS is Darwin, it checks for presence of HVF in the system. The
patch also adds strings related to HVF in the file qemu-options.hx.
QEMU will only support the modern syntax style '-M accel=hvf' no enable
hvf; the legacy '-enable-hvf' will not be supported.

- fix styling issues

- add glue code to cpus.c

- move HVFX86EmulatorState field to CPUX86State, changing the
the emulation functions to have a parameter with signature 'CPUX86State *'
instead of 'CPUState *' so we don't have to get the 'env'.
Signed-off-by: NSergio Andres Gomez Del Real <Sergio.G.DelReal@gmail.com>
Message-Id: <20170913090522.4022-2-Sergio.G.DelReal@gmail.com>
Message-Id: <20170913090522.4022-3-Sergio.G.DelReal@gmail.com>
Message-Id: <20170913090522.4022-5-Sergio.G.DelReal@gmail.com>
Message-Id: <20170913090522.4022-6-Sergio.G.DelReal@gmail.com>
Message-Id: <20170905035457.3753-7-Sergio.G.DelReal@gmail.com>
Signed-off-by: NPaolo Bonzini <pbonzini@redhat.com>

This patch adds the function apic_get_highest_priority_irr to
apic.c and exports it through the interface in apic.h for use by hvf.
Signed-off-by: NSergio Andres Gomez Del Real <Sergio.G.DelReal@gmail.com>
Message-Id: <20170913090522.4022-8-Sergio.G.DelReal@gmail.com>
Signed-off-by: NPaolo Bonzini <pbonzini@redhat.com>

When compiled with anything other than the 'log' trace backend, we have:

   error: implicit declaration of function 'qemu_log_mask'
   error: 'LOG_UNIMP' undeclared (first use in this function)

This patch adds the missing include.

Fixes: 7299e1a4
       ("hw/i386/vmport: replace fprintf() by trace events or LOG_UNIMP")
Signed-off-by: NLaurent Vivier <laurent@vivier.eu>
Message-id: 20171221211103.30311-1-laurent@vivier.eu
[PMM: fixed commit message description of when problem occurs]
Signed-off-by: NPeter Maydell <peter.maydell@linaro.org>

* NBD and chardev conversion to QIONetListener (Daniel)
* MTTCG fixes (David)
* Hyper-V fixes (Roman, Evgeny)
* share-rw option (Fam)
* Mux chardev event bugfix (Marc-André)
* Add systemd unit files in contrib/ (me)
* SCSI and block/iscsi.c bugfixes (me, Peter L.)
* unassigned_mem_ops fixes (Peter M.)
* VEX decoding fix (Peter M.)
* "info pic" and "info irq" improvements (Peter Xu)
* vmport trace events (Philippe)
* Braille chardev bugfix (Samuel)
* Compiler warnings fix (Stefan)
* initial support for TCG smoke test of more boards (Thomas)
* New CPU features (Yang)
* Reduce startup memory usage (Yang)
* QemuThread race fix (linhecheng)

# gpg: Signature made Thu 21 Dec 2017 08:30:49 GMT
# gpg:                using RSA key 0xBFFBD25F78C7AE83
# gpg: Good signature from "Paolo Bonzini <bonzini@gnu.org>"
# gpg:                 aka "Paolo Bonzini <pbonzini@redhat.com>"
# Primary key fingerprint: 46F5 9FBD 57D6 12E7 BFD4  E2F7 7E15 100C CD36 69B1
#      Subkey fingerprint: F133 3857 4B66 2389 866C  7682 BFFB D25F 78C7 AE83

* remotes/bonzini/tags/for-upstream: (41 commits)
  chardev: convert the socket server to QIONetListener
  blockdev: convert qemu-nbd server to QIONetListener
  blockdev: convert internal NBD server to QIONetListener
  test: add some chardev mux event tests
  chardev: fix backend events regression with mux chardev
  rcu: reduce more than 7MB heap memory by malloc_trim()
  checkpatch: volatile with a comment or sig_atomic_t is okay
  i8259: move TYPE_INTERRUPT_STATS_PROVIDER upper
  kvm-i8259: support "info pic" and "info irq"
  i8259: generalize statistics into common code
  i8259: use DEBUG_IRQ_COUNT always
  i8259: convert DPRINTFs into trace
  Remove legacy -no-kvm-pit option
  scsi: replace hex constants with #defines
  scsi: provide general-purpose functions to manage sense data
  hw/i386/vmport: replace fprintf() by trace events or LOG_UNIMP
  hw/mips/boston: Remove workaround for writes to ROM aborting
  exec: Don't reuse unassigned_mem_ops for io_mem_rom
  block/iscsi: only report an iSCSI Failure if we don't handle it gracefully
  block/iscsi: dont leave allocmap in an invalid state on UNMAP failure
  ...
Signed-off-by: NPeter Maydell <peter.maydell@linaro.org>

# gpg: Signature made Thu 21 Dec 2017 01:51:20 GMT
# gpg:                using RSA key 0xCA35624C6A9171C6
# gpg: Good signature from "Fam Zheng <famz@redhat.com>"
# Primary key fingerprint: 5003 7CB7 9706 0F76 F021  AD56 CA35 624C 6A91 71C6

* remotes/famz/tags/staging-pull-request:
  util: add is_equal to UUID API
  Revert "docker: Enable features explicitly in test-full"
Signed-off-by: NPeter Maydell <peter.maydell@linaro.org>

Instead of creating a QIOChannelSocket directly for the chardev
server socket, use a QIONetListener. This provides the ability
to listen on multiple sockets at the same time, so enables
full support for IPv4/IPv6 dual stack.
Signed-off-by: NDaniel P. Berrange <berrange@redhat.com>
Message-Id: <20171218135417.28301-2-berrange@redhat.com>
Signed-off-by: NPaolo Bonzini <pbonzini@redhat.com>

Instead of creating a QIOChannelSocket directly for the NBD
server socket, use a QIONetListener. This provides the ability
to listen on multiple sockets at the same time, so enables
full support for IPv4/IPv6 dual stack. This also means we can
honour multiple FDs received during socket activation.
Reviewed-by: NEric Blake <eblake@redhat.com>
Signed-off-by: NDaniel P. Berrange <berrange@redhat.com>
Message-Id: <20171218101643.20360-3-berrange@redhat.com>
Signed-off-by: NPaolo Bonzini <pbonzini@redhat.com>

Instead of creating a QIOChannelSocket directly for the NBD
server socket, use a QIONetListener. This provides the ability
to listen on multiple sockets at the same time, so enables
full support for IPv4/IPv6 dual stack.
Reviewed-by: NEric Blake <eblake@redhat.com>
Signed-off-by: NDaniel P. Berrange <berrange@redhat.com>
Message-Id: <20171218101643.20360-2-berrange@redhat.com>
Signed-off-by: NPaolo Bonzini <pbonzini@redhat.com>

Check the expected behaviour of qemu_chr_be_event() on a mux chardev.

For some reason, sending the event on the base chardev broadcast to
all frontends, while sending it on the mux chardev itself should
trigger the event on the currently focused chardev frontend.
Signed-off-by: NMarc-André Lureau <marcandre.lureau@redhat.com>
Message-Id: <20171103152824.21948-3-marcandre.lureau@redhat.com>
Signed-off-by: NPaolo Bonzini <pbonzini@redhat.com>

Kirill noticied that on recent versions on QEMU he was not able to
trigger SysRq to invoke debug capabilites of Linux Kernel.  He tracked
it down to qemu_chr_be_event() ignoring CHR_EVENT_BREAK due s->be
being NULL. The bug was introduced in 2.8, commit a4afa548 ("char:
move front end handlers in CharBackend"). Since the commit, the
qemu_chr_be_event() failed to deliver CHR_EVENT_BREAK due to
qemu_chr_fe_init() does not set s->be in case of mux.

Let's fix this by teaching mux to send an event to the frontend with
the focus.
Reported-by: NKirill A. Shutemov <kirill.shutemov@linux.intel.com>
Signed-off-by: NMarc-André Lureau <marcandre.lureau@redhat.com>
Fixes: a4afa548 ("char: move front end handlers in CharBackend")
Message-Id: <20171103152824.21948-2-marcandre.lureau@redhat.com>
Tested-by: NKirill A. Shutemov <kirill.shutemov@linux.intel.com>
Signed-off-by: NPaolo Bonzini <pbonzini@redhat.com>

Since there are some issues in memory alloc/free machenism
in glibc for little chunk memory, if Qemu frequently
alloc/free little chunk memory, the glibc doesn't alloc
little chunk memory from free list of glibc and still
allocate from OS, which make the heap size bigger and bigger.

This patch introduce malloc_trim(), which will free heap
memory when there is no rcu call during rcu thread loop.
malloc_trim() can be enabled/disabled by --enable-malloc-trim/
--disable-malloc-trim in the Qemu configure command. The
default malloc_trim() is enabled for libc.

Below are test results from smaps file.
(1)without patch
55f0783e1000-55f07992a000 rw-p 00000000 00:00 0  [heap]
Size:              21796 kB
Rss:               14260 kB
Pss:               14260 kB

(2)with patch
55cc5fadf000-55cc61008000 rw-p 00000000 00:00 0  [heap]
Size:              21668 kB
Rss:                6940 kB
Pss:                6940 kB
Signed-off-by: NYang Zhong <yang.zhong@intel.com>
Message-Id: <1513775806-19779-1-git-send-email-yang.zhong@intel.com>
Signed-off-by: NPaolo Bonzini <pbonzini@redhat.com>

This assumes that the comment gives some justification;
"volatile sig_atomic_t" is also self-explanatory and usually
correct.

Discussed in:
'[Qemu-devel] [PATCH] dump-guest-memory.py: fix "You can't do that without a process to debug"'
Suggested-by: NFam Zheng <famz@redhat.com>
Signed-off-by: NMarc-André Lureau <marcandre.lureau@redhat.com>
Message-Id: <20171215181810.4122-1-marcandre.lureau@redhat.com>
Signed-off-by: NPaolo Bonzini <pbonzini@redhat.com>

Now both classes (i8259, i8259-kvm) support this.  Move this upper to
the common class code.
Signed-off-by: NPeter Xu <peterx@redhat.com>
Message-Id: <20171210063819.14892-6-peterx@redhat.com>
Reviewed-by: NPhilippe Mathieu-Daudé <f4bug@amsat.org>
Signed-off-by: NPaolo Bonzini <pbonzini@redhat.com>

Let's leverage the i8259 common code for kvm-i8259 too.

I think it's still possible that stats can lost when i8259 is in kernel
and meanwhile when irqfd is used, e.g., by vfio or vhost devices.
However that should be rare IMHO since they should be using MSIs mostly
if they really want performance (that's why people use vhost and device
assignment), and no old INTx should be used.  As long as the INTx users
are emulated in QEMU the stats will be correct.

For "info pic", it should be always accurate since we fetch kvm regs
before dump.

More importantly, it's just too simple to do this now - it's only 10+
LOC to gain this feature.
Signed-off-by: NPeter Xu <peterx@redhat.com>
Message-Id: <20171210063819.14892-5-peterx@redhat.com>
Reviewed-by: NPhilippe Mathieu-Daudé <f4bug@amsat.org>
Signed-off-by: NPaolo Bonzini <pbonzini@redhat.com>

It was only for userspace i8259.  Move it to general code so that
kvm-i8259 can also use it in the future.
Signed-off-by: NPeter Xu <peterx@redhat.com>
Message-Id: <20171210063819.14892-4-peterx@redhat.com>
Signed-off-by: NPaolo Bonzini <pbonzini@redhat.com>

It's not really scary to even enable it forever.  After all it's i8259,
and it's even not the kernel one.

Then we can remove quite a few of lines to make it cleaner.  And "info
irq" will always work for it.
Signed-off-by: NPeter Xu <peterx@redhat.com>
Message-Id: <20171210063819.14892-3-peterx@redhat.com>
Reviewed-by: NPhilippe Mathieu-Daudé <f4bug@amsat.org>
Signed-off-by: NPaolo Bonzini <pbonzini@redhat.com>

One thing to mention is that in pic_set_irq() I need to uncomment a few
lines in the macros to make sure IRQ value calculation is correct.
Signed-off-by: NPeter Xu <peterx@redhat.com>
Message-Id: <20171210063819.14892-2-peterx@redhat.com>
Reviewed-by: NPhilippe Mathieu-Daudé <f4bug@amsat.org>
Signed-off-by: NPaolo Bonzini <pbonzini@redhat.com>

It's only printing a warning since QEMU v1.3.0, so nobody should use
this anymore today. Let's get rid of this now.
Signed-off-by: NThomas Huth <thuth@redhat.com>
Message-Id: <1513619065-31722-1-git-send-email-thuth@redhat.com>
Signed-off-by: NPaolo Bonzini <pbonzini@redhat.com>

Sense keys have nice #defines in scsi/constants.h, use them.
Reported-by: NDr. David Alan Gilbert <dgilbert@redhat.com>
Reviewed-by: NPhilippe Mathieu-Daudé <f4bug@amsat.org>
Signed-off-by: NPaolo Bonzini <pbonzini@redhat.com>

Extract the common parts of scsi_sense_buf_to_errno, scsi_convert_sense
and scsi_target_send_command's REQUEST SENSE handling into two new
functions scsi_parse_sense_buf and scsi_build_sense_buf.

Fix a bug in scsi_target_send_command along the way; the length was
written in buf[10] rather than buf[7].
Reported-by: NDr. David Alan Gilbert <dgilbert@redhat.com>
Reviewed-by: NDr. David Alan Gilbert <dgilbert@redhat.com>
Fixes: b07fbce6 ("scsi-bus: correct responses for INQUIRY and REQUEST SENSE")
Signed-off-by: NPaolo Bonzini <pbonzini@redhat.com>

Signed-off-by: NPhilippe Mathieu-Daudé <f4bug@amsat.org>
Message-Id: <20171215034356.4449-2-f4bug@amsat.org>
[Replace unknown command tracepoint with LOG_UNIMP, add
 generic tracepoint for vmport commands. - Paolo]
Signed-off-by: NPaolo Bonzini <pbonzini@redhat.com>

Now that the memory system correctly handles writes to ROM for
guest CPUs that may generate exceptions for decode errors, we
can remove the workaround from the boston board.
Signed-off-by: NPeter Maydell <peter.maydell@linaro.org>
Message-Id: <1513187549-2435-3-git-send-email-peter.maydell@linaro.org>
Signed-off-by: NPaolo Bonzini <pbonzini@redhat.com>

We set up the io_mem_rom special memory region using the
unassigned_mem_ops structure; this is then used when a guest tries to
write to ROM.  This is incorrect, because the behaviour of unassigned
memory may be different from that of ROM for writes.  In particular,
on some architectures writing to unassigned memory generates a guest
exception, whereas writing to ROM is generally ignored.  Use a
special readonly_mem_ops for this purpose instead, so writes to
ROM are ignored for all guest CPUs.
Signed-off-by: NPeter Maydell <peter.maydell@linaro.org>
Message-Id: <1513187549-2435-2-git-send-email-peter.maydell@linaro.org>
Signed-off-by: NPaolo Bonzini <pbonzini@redhat.com>

we currently report an "iSCSI Failure" in iscsi_co_generic_cb if the task
hasn't completed with SCSI_STATUS_GOOD. However, we expect a failure in
some cases and handle it gracefully. This is the case for misaligned UNMAPs
and WRITESAME10/16 calls without UNMAP. In this case a failure in the
logs can be quite misleading.

While we are at it improve the logging to reveal which operation failed
at what LBA.
Signed-off-by: NPeter Lieven <pl@kamp.de>
Message-Id: <1512733868-9009-3-git-send-email-pl@kamp.de>
Signed-off-by: NPaolo Bonzini <pbonzini@redhat.com>

we forgot to set the allocmap to invalid if an UNMAP call fails.

Cc: qemu-stable@nongnu.org
Signed-off-by: NPeter Lieven <pl@kamp.de>
Message-Id: <1512733868-9009-2-git-send-email-pl@kamp.de>
Reviewed-by: NEric Blake <eblake@redhat.com>
Signed-off-by: NPaolo Bonzini <pbonzini@redhat.com>

Renaming cpu address space names so that they won't be the same when
there are more than one.
Signed-off-by: NPeter Xu <peterx@redhat.com>
Message-Id: <20171123092333.16085-4-peterx@redhat.com>
Signed-off-by: NPaolo Bonzini <pbonzini@redhat.com>

Normally we create an address space for that CPU and pass that address
space into the function.  Let's just do it inside to unify address space
creations.  It'll simplify my next patch to rename those address spaces.
Signed-off-by: NPeter Xu <peterx@redhat.com>
Message-Id: <20171123092333.16085-3-peterx@redhat.com>
Signed-off-by: NPaolo Bonzini <pbonzini@redhat.com>

The moxiesim machine already defines a memory region for a firmware,
but does not provide the possibility to load an image via "-bios" yet.
This will be needed for the boot-serial tester, so let's add support
for "-bios" here now.
Signed-off-by: NThomas Huth <thuth@redhat.com>
Message-Id: <1512031988-32490-6-git-send-email-thuth@redhat.com>
Signed-off-by: NPaolo Bonzini <pbonzini@redhat.com>

QEMU only ships with some few firmware images, i.e. we can currently run
the boot-serial test only on a very limited set of machines. But writing
some characters to the default UART of a machine can often be done with
some few lines of assembly, so we add the possibility to the boot-serial
tester to use its own mini-kernels or mini-firmwares. We write such images
then into a file that we can load with the "-kernel" or "-bios" parameter
when we launch QEMU.
Signed-off-by: NThomas Huth <thuth@redhat.com>
Message-Id: <1512031988-32490-3-git-send-email-thuth@redhat.com>
Signed-off-by: NPaolo Bonzini <pbonzini@redhat.com>

If the guest continuesly writes characters to the UART, we never leave
the inner while loop and thus never check whether we've reached the
timeout value. So if we fail to find the expected string in the UART
output, the test just hangs and never finishs. Use a counter to regularly
break out of the while loop to check the timeout.
Signed-off-by: NThomas Huth <thuth@redhat.com>
Message-Id: <1512031988-32490-2-git-send-email-thuth@redhat.com>
Signed-off-by: NPaolo Bonzini <pbonzini@redhat.com>

In commit e3af7c78 we
replaced direct calls to to cpu_ld*_code() with calls
to the x86_ld*_code() wrappers which incorporate an
advance of s->pc. Unfortunately we didn't notice that
in one place the old code was deliberately not incrementing
s->pc:

@@ -4501,7 +4528,7 @@ static target_ulong disas_insn(DisasContext *s, CPUState *cpu)
             static const int pp_prefix[4] = {
                 0, PREFIX_DATA, PREFIX_REPZ, PREFIX_REPNZ
             };
-            int vex3, vex2 = cpu_ldub_code(env, s->pc);
+            int vex3, vex2 = x86_ldub_code(env, s);

             if (!CODE64(s) && (vex2 & 0xc0) != 0xc0) {
                 /* 4.1.4.6: In 32-bit mode, bits [7:6] must be 11b,

This meant we were mishandling this set of instructions.
Remove the manual advance of s->pc for the "is VEX" case
(which is now done by x86_ldub_code()) and instead rewind
PC in the case where we decide that this isn't really VEX.
Signed-off-by: NPeter Maydell <peter.maydell@linaro.org>
Cc: qemu-stable@nongnu.org
Reported-by: NAlexandro Sanchez Bach <alexandro@phi.nz>
Message-Id: <1513163959-17545-1-git-send-email-peter.maydell@linaro.org>
Signed-off-by: NPaolo Bonzini <pbonzini@redhat.com>

When listening on unix/tcp sockets there was optional code that would update
the original SocketAddress struct with the info about the actual address that
was listened on. Since the conversion of everything to QIOChannelSocket, no
remaining caller made use of this feature. It has been replaced with the ability
to query the listen address after the fact using the function
qio_channel_socket_get_local_address. This is a better model when the input
address can result in listening on multiple distinct sockets.
Signed-off-by: NDaniel P. Berrange <berrange@redhat.com>
Reviewed-by: NPeter Xu <peterx@redhat.com>
Message-Id: <20171212111219.32601-1-berrange@redhat.com>
Signed-off-by: NPaolo Bonzini <pbonzini@redhat.com>

Baum device bigger than 84 do not actually exist, but the user's own
Braille device might be wider than 84 columns.  Some guest drivers
would be upset by such sizes, so clamp the device size.
Signed-off-by: NSamuel Thibault <samuel.thibault@ens-lyon.org>
Message-Id: <20171211001950.27843-1-samuel.thibault@ens-lyon.org>
Signed-off-by: NPaolo Bonzini <pbonzini@redhat.com>

These gcc warnings are fixed:

target/i386/translate.c:4461:12: warning:
 variable 'prefixes' might be clobbered by 'longjmp' or 'vfork' [-Wclobbered]
target/i386/translate.c:4466:9: warning:
 variable 'rex_w' might be clobbered by 'longjmp' or 'vfork' [-Wclobbered]
target/i386/translate.c:4466:16: warning:
 variable 'rex_r' might be clobbered by 'longjmp' or 'vfork' [-Wclobbered]

Tested with x86_64-w64-mingw32-gcc from Debian stretch.
Signed-off-by: NStefan Weil <sw@weilnetz.de>
Message-Id: <20171113064845.29142-1-sw@weilnetz.de>
Signed-off-by: NPaolo Bonzini <pbonzini@redhat.com>

The conditional memory barrier not only looks strange but actually is
wrong.

On s390x, I can reproduce interrupts via cpu_interrupt() not leading to
a proper kick out of emulation every now and then. cpu_interrupt() is
especially used for inter CPU communication via SIGP (esp. external
calls and emergency interrupts).

With this patch, I was not able to reproduce. (esp. no stalls or hangs
in the guest).

My setup is s390x MTTCG with 16 VCPUs on 8 CPU host, running make -j16.
Signed-off-by: NDavid Hildenbrand <david@redhat.com>
Message-Id: <20171129191319.11483-1-david@redhat.com>
Signed-off-by: NPaolo Bonzini <pbonzini@redhat.com>

pause_all_cpus() is sometimes called from a VCPU thread (e.g. s390x
during special reset). It cannot deal with multiple VCPUs per Thread
(single threaded TCG) yet.

Booting an s390x guest with -smp 2 and single threaded TCG from disk
currently fails. The DIAG 308 will issue a pause_all_cpus() and wait
forever for the CPUs to actually stop. But it is waiting for itself.

So let's stop all VCPUs belonging to the current thread. Factor out
stopping of a VCPU.
Signed-off-by: NDavid Hildenbrand <david@redhat.com>
Message-Id: <20171129191215.11323-1-david@redhat.com>
Signed-off-by: NPaolo Bonzini <pbonzini@redhat.com>

The value of HV_X64_MSR_SVERSION is initialized once at vcpu init, and
is reset to zero on vcpu reset, which is wrong.

It is supposed to be a constant, so drop the field from X86CPU, set the
msr with the constant value, and don't bother getting it.
Signed-off-by: NRoman Kagan <rkagan@virtuozzo.com>
Message-Id: <20171122181418.14180-4-rkagan@virtuozzo.com>
Signed-off-by: NPaolo Bonzini <pbonzini@redhat.com>

Initially SINTx msrs should be in "masked" state.  To ensure that
happens on *every* reset, move setting their values to
kvm_arch_vcpu_reset.
Signed-off-by: NRoman Kagan <rkagan@virtuozzo.com>
Message-Id: <20171122181418.14180-3-rkagan@virtuozzo.com>
Signed-off-by: NPaolo Bonzini <pbonzini@redhat.com>

Hyper-V has a notion of partition-wide MSRs.  Those MSRs are read and
written as usual on each VCPU, however the hypervisor maintains a single
global value for all VCPUs.  Thus writing such an MSR from any single
VCPU affects the global value that is read by all other VCPUs.

This leads to an issue during VCPU hotplug: the zero-initialzied values
of those MSRs get synced into KVM and override the global values as has
already been set by the guest.

This change makes the partition-wide MSRs only be synchronized on the
first vcpu.
Signed-off-by: NEvgeny Yakovlev <eyakovlev@virtuozzo.com>
Signed-off-by: NRoman Kagan <rkagan@virtuozzo.com>
Message-Id: <20171122181418.14180-2-rkagan@virtuozzo.com>
Signed-off-by: NPaolo Bonzini <pbonzini@redhat.com>

Intel IceLake cpu has added new cpu features,AVX512_VBMI2/GFNI/
VAES/VPCLMULQDQ/AVX512_VNNI/AVX512_BITALG. Those new cpu features
need expose to guest VM.

The bit definition:
CPUID.(EAX=7,ECX=0):ECX[bit 06] AVX512_VBMI2
CPUID.(EAX=7,ECX=0):ECX[bit 08] GFNI
CPUID.(EAX=7,ECX=0):ECX[bit 09] VAES
CPUID.(EAX=7,ECX=0):ECX[bit 10] VPCLMULQDQ
CPUID.(EAX=7,ECX=0):ECX[bit 11] AVX512_VNNI
CPUID.(EAX=7,ECX=0):ECX[bit 12] AVX512_BITALG

The release document ref below link:
https://software.intel.com/sites/default/files/managed/c5/15/\
architecture-instruction-set-extensions-programming-reference.pdf
Signed-off-by: NYang Zhong <yang.zhong@intel.com>
Message-Id: <1511335676-20797-1-git-send-email-yang.zhong@intel.com>
Signed-off-by: NPaolo Bonzini <pbonzini@redhat.com>