scripts/simplebench improvements for 2021-05-04

# gpg: Signature made Tue 04 May 2021 09:45:15 BST
# gpg:                using RSA key 8B9C26CDB2FD147C880E86A1561F24C1F19F79FB
# gpg: Good signature from "Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>" [unknown]
# gpg: WARNING: This key is not certified with a trusted signature!
# gpg:          There is no indication that the signature belongs to the owner.
# Primary key fingerprint: 8B9C 26CD B2FD 147C 880E  86A1 561F 24C1 F19F 79FB

* remotes/vsementsov/tags/pull-simplebench-2021-05-04:
  MAINTAINERS: update Benchmark util: add git tree
  simplebench/bench-backup: add --drop-caches argument
  simplebench/bench-backup: add --count and --no-initial-run
  simplebench/bench-backup: support qcow2 source files
  simplebench/bench_block_job: handle error in BLOCK_JOB_COMPLETED
  simplebench/bench-backup: add target-cache argument
  simplebench/bench-backup: add --compressed option
  simplebench: bench_one(): support count=1
  simplebench: bench_one(): add slow_limit argument

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>

nbd patches for 2021-05-11

- fix fd passing to qemu-storage-daemon --nbd-server

# gpg: Signature made Tue 11 May 2021 20:26:22 BST
# gpg:                using RSA key 71C2CC22B1C4602927D2F3AAA7A16B4A2527436A
# gpg: Good signature from "Eric Blake <eblake@redhat.com>" [full]
# gpg:                 aka "Eric Blake (Free Software Programmer) <ebb9@byu.net>" [full]
# gpg:                 aka "[jpeg image of size 6874]" [full]
# Primary key fingerprint: 71C2 CC22 B1C4 6029 27D2  F3AA A7A1 6B4A 2527 436A

* remotes/ericb/tags/pull-nbd-2021-05-11:
  sockets: update SOCKET_ADDRESS_TYPE_FD listen(2) backlog

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>

QAPI patches patches for 2021-05-20

# gpg: Signature made Thu 20 May 2021 16:10:21 BST
# gpg:                using RSA key 354BC8B3D7EB2A6B68674E5F3870B400EB918653
# gpg:                issuer "armbru@redhat.com"
# gpg: Good signature from "Markus Armbruster <armbru@redhat.com>" [full]
# gpg:                 aka "Markus Armbruster <armbru@pond.sub.org>" [full]
# Primary key fingerprint: 354B C8B3 D7EB 2A6B 6867  4E5F 3870 B400 EB91 8653

* remotes/armbru/tags/pull-qapi-2021-05-20:
  qapi/parser: add docstrings
  qapi/parser: allow 'ch' variable name
  qapi/parser: Remove superfluous list comprehension
  qapi/parser: add type hint annotations
  qapi/parser: Rework _check_pragma_list_of_str as a TypeGuard
  qapi/parser: Fix token membership tests when token can be None
  qapi: add must_match helper
  qapi/parser: Use @staticmethod where appropriate
  qapi/parser: assert object keys are strings
  qapi/parser: enforce all top-level expressions must be dict in _parse()
  qapi/parser: Assert lexer value is a string
  qapi/parser: factor parsing routine into method
  qapi/source: Remove line number from QAPISourceInfo initializer
  qapi: Add test for nonexistent schema file
  qapi/parser: Don't try to handle file errors

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>

s390x fixes and cleanups; also related fixes in xtensa,
arm, and x86 code

# gpg: Signature made Thu 20 May 2021 13:23:15 BST
# gpg:                using RSA key C3D0D66DC3624FF6A8C018CEDECF6B93C6F02FAF
# gpg:                issuer "cohuck@redhat.com"
# gpg: Good signature from "Cornelia Huck <conny@cornelia-huck.de>" [unknown]
# gpg:                 aka "Cornelia Huck <huckc@linux.vnet.ibm.com>" [full]
# gpg:                 aka "Cornelia Huck <cornelia.huck@de.ibm.com>" [full]
# gpg:                 aka "Cornelia Huck <cohuck@kernel.org>" [unknown]
# gpg:                 aka "Cornelia Huck <cohuck@redhat.com>" [unknown]
# Primary key fingerprint: C3D0 D66D C362 4FF6 A8C0  18CE DECF 6B93 C6F0 2FAF

* remotes/cohuck-gitlab/tags/s390x-20210520-v2:
  tests/tcg/x86_64: add vsyscall smoke test
  target/i386: Make sure that vsyscall's tb->size != 0
  vfio-ccw: Attempt to clean up all IRQs on error
  hw/s390x/ccw: Register qbus type in abstract TYPE_CCW_DEVICE parent
  vfio-ccw: Permit missing IRQs
  accel/tcg: Assert that tb->size != 0 after translation
  target/xtensa: Make sure that tb->size != 0
  target/arm: Make sure that commpage's tb->size != 0
  target/s390x: Fix translation exception on illegal instruction

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>

Signed-off-by: John Snow <jsnow@redhat.com>
Message-Id: <20210519183951.3946870-16-jsnow@redhat.com>
Reviewed-by: Markus Armbruster <armbru@redhat.com>
[Doc string spacing tweaked slightly]
Signed-off-by: Markus Armbruster <armbru@redhat.com>

We can have a two-letter variable name, as a treat.

Signed-off-by: John Snow <jsnow@redhat.com>
Message-Id: <20210519183951.3946870-15-jsnow@redhat.com>
Reviewed-by: Markus Armbruster <armbru@redhat.com>
Signed-off-by: Markus Armbruster <armbru@redhat.com>

pull-bsd-user-20210511 is the next round of cleanups to bsd-user in merging the
bsd-user fork into qemu. It contains a number of style commits, as well as 3
commits that start to change things: Some unused files are deleted, building the
sparc and sparc64 targets are removed, and a structure is renamed.

The next set of pull requests will start to execute the following plan:
1. Move existing code around to have a structure similar to the bsd-user fork.
2. Incrementally merge groups of system calls, focused on making x86 work.
3. Once the groups of system calls are all merged, additional platforms will
   be added back.
4. Concurrently, as changes are requested as part of the merge happen, those
   changes will be merged into the fork. An experimental merge to tip of master
   is under test and is what will be updated.
5. Eventually, there will be no diference, and the bsd-user fork will only
   be a staging area for cutting-edge features prior to upstreaming into
   qemu mainline.

The bsd-user code in qemu has a lot of style issues. This cleans up a number in
the files touched. However, the checkpatch.pl detects some incremental issues in
the commits. The following are expected, but are corrected in later hashes in
this branch. MAINTAINERS does not need to be updated, since all the files added
or deleted are covered under existing regexp in MAINTAINERS.

Checking all commits since f9a576a8...
d60c3b93:101: ERROR: consider using qemu_strtol in preference to strtol
d60c3b93:142: ERROR: braces {} are necessary for all arms of this statement
d60c3b93:145: ERROR: braces {} are necessary for all arms of this statement
total: 3 errors, 0 warnings, 119 lines checked
b4bebeee:148: WARNING: line over 80 characters
b4bebeee:330: ERROR: braces {} are necessary for all arms of this statement
b4bebeee:340: ERROR: braces {} are necessary for all arms of this statement
b4bebeee:381: ERROR: space prohibited between function name and open parenthesis '('
b4bebeee:390: ERROR: spaces required around that '<' (ctx:VxV)
b4bebeee:408: WARNING: Block comments use a leading /* on a separate line
b4bebeee:409: WARNING: Block comments use * on subsequent lines
b4bebeee:409: WARNING: Block comments use a trailing */ on a separate line
b4bebeee:441: WARNING: line over 80 characters
b4bebeee:445: WARNING: line over 80 characters
b4bebeee:502: ERROR: line over 90 characters
b4bebeee:551: ERROR: space required after that ',' (ctx:VxV)
b4bebeee:552: ERROR: space required after that ',' (ctx:VxV)
b4bebeee:587: ERROR: space required after that ';' (ctx:VxV)
b4bebeee:623: ERROR: suspect code indent for conditional statements (12, 14)
total: 9 errors, 6 warnings, 664 lines checked
86545e7a:31: ERROR: space required after that ';' (ctx:VxV)
86545e7a:40: ERROR: space required after that ';' (ctx:VxV)
total: 2 errors, 0 warnings, 60 lines checked
Use of uninitialized value $acpi_testexpected in string eq at scripts/checkpatch.pl line 1529.
65d58c91:22: WARNING: added, moved or deleted file(s), does MAINTAINERS need updating?
total: 0 errors, 1 warnings, 14 lines checked
Use of uninitialized value $acpi_testexpected in string eq at scripts/checkpatch.pl line 1529.
f8ce3970:21: WARNING: added, moved or deleted file(s), does MAINTAINERS need updating?
total: 0 errors, 1 warnings, 0 lines checked
   FAIL one or more commits failed scripts/checkpatch.pl
Cleaning up file based variables
ERROR: Job failed: exit code 1

# gpg: Signature made Wed 12 May 2021 17:40:34 BST
# gpg:                using RSA key 2035F894B00AA3CF7CCDE1B76C1CD1287DB01100
# gpg: Good signature from "Warner Losh <wlosh@netflix.com>" [unknown]
# gpg:                 aka "Warner Losh <imp@bsdimp.com>" [unknown]
# gpg:                 aka "Warner Losh <imp@freebsd.org>" [unknown]
# gpg:                 aka "Warner Losh <imp@village.org>" [unknown]
# gpg:                 aka "Warner Losh <wlosh@bsdimp.com>" [unknown]
# gpg: WARNING: This key is not certified with a trusted signature!
# gpg:          There is no indication that the signature belongs to the owner.
# Primary key fingerprint: 2035 F894 B00A A3CF 7CCD  E1B7 6C1C D128 7DB0 1100

* remotes/bsdimp/tags/pull-bsd-user-20210511:
  bsd-user: rename linux_binprm to bsd_binprm
  bsd-user: Stop building the sparc targets
  bsd-user: remove target_signal.h, it's unused
  bsd-user: style tweak: keyword space (
  bsd-user: style tweak: Remove #if 0'd code
  bsd-user: style tweak: keyword space (
  bsd-user: style tweak: keyword space (
  bsd-user: whitespace changes
  bsd-user: use qemu_strtoul in preference to strtol
  bsd-user: style tweak: use {} consistently in for / if / else statements
  bsd-user: style tweak: use {} for all if statements, format else correctly
  bsd-user: style tweak: don't assign in if statements
  bsd-user: style tweak: Use preferred block comments
  bsd-user: style tweak: remove spacing after '*' and add after }
  bsd-user: style tweak: move extern to header file
  bsd-user: Remove commented out code
  bsd-user: style tweak: Use preferred block comments
  bsd-user: style tweak: Remove #if 0'd code
  bsd-user: style tweak: use C not C++ comments
  bsd-user: whitespace changes

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>

Having a small test will prevent trivial regressions in the future.

Signed-off-by: Ilya Leoshkevich <iii@linux.ibm.com>
Message-Id: <20210519045738.1335210-3-iii@linux.ibm.com>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Signed-off-by: Cornelia Huck <cohuck@redhat.com>

tb_gen_code() assumes that tb->size must never be zero, otherwise it
may produce spurious exceptions. For x86_64 this may happen when
creating a translation block for the vsyscall page.

Fix by pretending that vsyscall translation blocks have at least one
instruction.

Signed-off-by: Ilya Leoshkevich <iii@linux.ibm.com>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-Id: <20210519045738.1335210-2-iii@linux.ibm.com>
Signed-off-by: Cornelia Huck <cohuck@redhat.com>

The vfio_ccw_unrealize() routine makes an unconditional attempt to
unregister every IRQ notifier, though they may not have been registered
in the first place (when running on an older kernel, for example).

Let's mirror this behavior in the error cleanups in vfio_ccw_realize()
so that if/when new IRQs are added, it is less confusing to recognize
the necessary procedures. The worst case scenario would be some extra
messages about an undefined IRQ, but since this is an error exit that
won't be the only thing to worry about.

And regarding those messages, let's change it to a warning instead of
an error, to better reflect their severity. The existing code in both
paths handles everything anyway.

Signed-off-by: Eric Farman <farman@linux.ibm.com>
Acked-by: Matthew Rosato <mjrosato@linux.ibm.com>
Message-Id: <20210428143652.1571487-1-farman@linux.ibm.com>
Signed-off-by: Cornelia Huck <cohuck@redhat.com>

Instead of having all TYPE_CCW_DEVICE children set the bus type to
TYPE_VIRTUAL_CSS_BUS, do it once in the abstract parent.

Signed-off-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Acked-by: Eric Farman <farman@linux.ibm.com>
Message-Id: <20210424145313.3287400-1-f4bug@amsat.org>
Signed-off-by: Cornelia Huck <cohuck@redhat.com>

Commit 690e29b9 ("vfio-ccw: Refactor ccw irq handler") changed
one of the checks for the IRQ notifier registration from saying
"the host needs to recognize the only IRQ that exists" to saying
"the host needs to recognize ANY IRQ that exists."

And this worked fine, because the subsequent change to support the
CRW IRQ notifier doesn't get into this code when running on an older
kernel, thanks to a guard by a capability region. The later addition
of the REQ(uest) IRQ by commit b2f96f9e ("vfio-ccw: Connect the
device request notifier") broke this assumption because there is no
matching capability region. Thus, running new QEMU on an older
kernel fails with:

  vfio: unexpected number of irqs 2

Let's adapt the message here so that there's a better clue of what
IRQ is missing.

Furthermore, let's make the REQ(uest) IRQ not fail when attempting
to register it, to permit running vfio-ccw on a newer QEMU with an
older kernel.

Fixes: b2f96f9e ("vfio-ccw: Connect the device request notifier")
Signed-off-by: Eric Farman <farman@linux.ibm.com>
Message-Id: <20210421152053.2379873-1-farman@linux.ibm.com>
Signed-off-by: Cornelia Huck <cohuck@redhat.com>

If arch-specific code generates a translation block of size 0,
tb_gen_code() may generate a spurious exception. Add an assertion in
order to catch such situations early.

Signed-off-by: Ilya Leoshkevich <iii@linux.ibm.com>
Reviewed-by: David Hildenbrand <david@redhat.com>
Message-Id: <20210416154939.32404-5-iii@linux.ibm.com>
Signed-off-by: Cornelia Huck <cohuck@redhat.com>

tb_gen_code() assumes that tb->size must never be zero, otherwise it
may produce spurious exceptions. For xtensa this may happen when
decoding an unknown instruction, when handling a write into the
CCOUNT or CCOMPARE special register and when single-stepping the first
instruction of an exception handler.

Fix by pretending that the size of the respective translation block is
1 in all these cases.

Signed-off-by: Ilya Leoshkevich <iii@linux.ibm.com>
Tested-by: Max Filippov <jcmvbkbc@gmail.com>
Acked-by: Max Filippov <jcmvbkbc@gmail.com>
Message-Id: <20210416154939.32404-4-iii@linux.ibm.com>
Signed-off-by: Cornelia Huck <cohuck@redhat.com>

tb_gen_code() assumes that tb->size must never be zero, otherwise it
may produce spurious exceptions. For ARM this may happen when creating
a translation block for the commpage.

Fix by pretending that commpage translation blocks have at least one
instruction.

Signed-off-by: Ilya Leoshkevich <iii@linux.ibm.com>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-Id: <20210416154939.32404-3-iii@linux.ibm.com>
Signed-off-by: Cornelia Huck <cohuck@redhat.com>

Hitting an uretprobe in a s390x TCG guest causes a SIGSEGV. What
happens is:

* uretprobe maps a userspace page containing an invalid instruction.
* uretprobe replaces the target function's return address with the
  address of that page.
* When tb_gen_code() is called on that page, tb->size ends up being 0
  (because the page starts with the invalid instruction), which causes
  virt_page2 to point to the previous page.
* The previous page is not mapped, so this causes a spurious
  translation exception.

tb->size must never be 0: even if there is an illegal instruction, the
instruction bytes that have been looked at must count towards tb->size.
So adjust s390x's translate_one() to act this way for both illegal
instructions and instructions that are known to generate exceptions.

Signed-off-by: Ilya Leoshkevich <iii@linux.ibm.com>
Reviewed-by: David Hildenbrand <david@redhat.com>
Message-Id: <20210416154939.32404-2-iii@linux.ibm.com>
Signed-off-by: Cornelia Huck <cohuck@redhat.com>

Eliminate user-only helper stubs for privledged insns.

# gpg: Signature made Wed 19 May 2021 19:24:27 BST
# gpg:                using RSA key 7A481E78868B4DB6A85A05C064DF38E8AF7E215F
# gpg:                issuer "richard.henderson@linaro.org"
# gpg: Good signature from "Richard Henderson <richard.henderson@linaro.org>" [full]
# Primary key fingerprint: 7A48 1E78 868B 4DB6 A85A  05C0 64DF 38E8 AF7E 215F

* remotes/rth-gitlab/tags/pull-x86-20210519: (50 commits)
  target/i386: Remove user-only i/o stubs
  target/i386: Move helper_check_io to sysemu
  target/i386: Create helper_check_io
  target/i386: Pass in port to gen_check_io
  target/i386: Tidy gen_check_io
  target/i386: Exit tb after wrmsr
  target/i386: Eliminate user stubs for read/write_crN, rd/wrmsr
  target/i386: Inline user cpu_svm_check_intercept_param
  target/i386: Unify invlpg, invlpga
  target/i386: Move invlpg, hlt, monitor, mwait to sysemu
  target/i386: Pass env to do_pause and do_hlt
  target/i386: Cleanup read_crN, write_crN, lmsw
  target/i386: Remove user stub for cpu_vmexit
  target/i386: Remove pc_start argument to gen_svm_check_intercept
  target/i386: Tidy svm_check_intercept from tcg
  target/i386: Simplify gen_debug usage
  target/i386: Mark some helpers as noreturn
  target/i386: Eliminate SVM helpers for user-only
  target/i386: Implement skinit in translate.c
  target/i386: Assert !GUEST for user-only
  ...

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>

A generator suffices (and quiets a pylint warning).

Signed-off-by: John Snow <jsnow@redhat.com>
Message-Id: <20210519183951.3946870-14-jsnow@redhat.com>
Reviewed-by: Markus Armbruster <armbru@redhat.com>
Signed-off-by: Markus Armbruster <armbru@redhat.com>

Annotations do not change runtime behavior.
This commit *only* adds annotations.

(Annotations for QAPIDoc are in a forthcoming commit.)

Signed-off-by: John Snow <jsnow@redhat.com>
Message-Id: <20210519183951.3946870-13-jsnow@redhat.com>
Reviewed-by: Markus Armbruster <armbru@redhat.com>
Signed-off-by: Markus Armbruster <armbru@redhat.com>

TypeGuards wont exist in Python proper until 3.10. Ah well. We can hack
up our own by declaring this function to return the type we claim it
checks for and using this to safely downcast object -> List[str].

In so doing, I bring this function under _pragma so it can use the
'info' object in its closure. Having done this, _pragma also now no
longer needs to take a 'self' parameter, so drop it.

To help with line-length, and with the context evident from its new
scope, rename the function to the shorter check_list_str().

Signed-off-by: John Snow <jsnow@redhat.com>

Message-Id: <20210519183951.3946870-12-jsnow@redhat.com>
Reviewed-by: Markus Armbruster <armbru@redhat.com>
Signed-off-by: Markus Armbruster <armbru@redhat.com>

When the token can be None (EOF), we can't use 'x in "abc"' style
membership tests to group types of tokens together, because 'None in
"abc"' is a TypeError.

Easy enough to fix. (Use a tuple: It's neither a static typing error nor
a runtime error to check for None in Tuple[str, ...])

Add tests to prevent a regression. (Note: they cannot be added prior to
this fix, as the unhandled stack trace will not match test output in the
CI system.)

Signed-off-by: John Snow <jsnow@redhat.com>
Message-Id: <20210519183951.3946870-11-jsnow@redhat.com>
Reviewed-by: Markus Armbruster <armbru@redhat.com>
Signed-off-by: Markus Armbruster <armbru@redhat.com>

Mypy cannot generally understand that these regex functions cannot
possibly fail. Add a "must_match" helper that makes this clear for
mypy.

Signed-off-by: John Snow <jsnow@redhat.com>
Message-Id: <20210519183951.3946870-10-jsnow@redhat.com>
Reviewed-by: Markus Armbruster <armbru@redhat.com>
Signed-off-by: Markus Armbruster <armbru@redhat.com>

No self, no thank you!

(Quiets pylint warnings.)

Signed-off-by: John Snow <jsnow@redhat.com>
Message-Id: <20210519183951.3946870-9-jsnow@redhat.com>
Reviewed-by: Markus Armbruster <armbru@redhat.com>
Signed-off-by: Markus Armbruster <armbru@redhat.com>

The single quote token implies the value is a string. Assert this to be
the case, to allow us to write an accurate return type for get_members.

Signed-off-by: John Snow <jsnow@redhat.com>
Message-Id: <20210519183951.3946870-8-jsnow@redhat.com>
Reviewed-by: Markus Armbruster <armbru@redhat.com>
Signed-off-by: Markus Armbruster <armbru@redhat.com>

Instead of using get_expr nested=False, allow get_expr to always return
any expression. In exchange, add a new error message to the top-level
parser that explains the semantic error: Top-level expressions must
always be JSON objects.

This helps mypy understand the rest of this function which assumes that
get_expr did indeed return a dict.

The exception type changes from QAPIParseError to QAPISemError as a
result, and the error message in two tests now changes.

Signed-off-by: John Snow <jsnow@redhat.com>

Message-Id: <20210519183951.3946870-7-jsnow@redhat.com>
Reviewed-by: Markus Armbruster <armbru@redhat.com>
Signed-off-by: Markus Armbruster <armbru@redhat.com>

The type checker can't narrow the type of the token value to string,
because it's only loosely correlated with the return token.

We know that a token of '#' should always have a "str" value.
Add an assertion.

Signed-off-by: John Snow <jsnow@redhat.com>
Message-Id: <20210519183951.3946870-6-jsnow@redhat.com>
Reviewed-by: Markus Armbruster <armbru@redhat.com>
Signed-off-by: Markus Armbruster <armbru@redhat.com>

For the sake of keeping __init__ smaller (and treating it more like a
gallery of what state variables we can expect to see), put the actual
parsing action into a parse method. It remains invoked from the init
method to reduce churn.

To accomplish this, @previously_included becomes the private data
member ._included, and the filename is stashed as ._fname.

Add any missing declarations to the init method, and group them by
function so they can be understood quickly at a glance.

Signed-off-by: John Snow <jsnow@redhat.com>
Message-Id: <20210519183951.3946870-5-jsnow@redhat.com>
Reviewed-by: Markus Armbruster <armbru@redhat.com>
Signed-off-by: Markus Armbruster <armbru@redhat.com>

With the QAPISourceInfo(None, None, None) construct gone, there's no
longer any reason to have to specify that a file starts on the first
line. Remove it from the initializer and default it to 1.

Remove the last vestiges where we check for 'line' being unset, that
can't happen, now.

Signed-off-by: John Snow <jsnow@redhat.com>
Message-Id: <20210519183951.3946870-4-jsnow@redhat.com>
Reviewed-by: Markus Armbruster <armbru@redhat.com>
Signed-off-by: Markus Armbruster <armbru@redhat.com>

This tests the error-return pathway introduced in the previous commit.
(Thanks to Paolo for the help with the Meson magic.)

Signed-off-by: John Snow <jsnow@redhat.com>

Message-Id: <20210519183951.3946870-3-jsnow@redhat.com>
Reviewed-by: Markus Armbruster <armbru@redhat.com>
Signed-off-by: Markus Armbruster <armbru@redhat.com>

Fixes: f5d4361c
Fixes: 52a47418
Fixes: 46f49468

Remove the try/except block that handles file-opening errors in
QAPISchemaParser.__init__() and add one each to
QAPISchemaParser._include() and QAPISchema.__init__() respectively.

This simultaneously fixes the typing of info.fname (f5d4361c), A
static typing violation in test-qapi (46f49468), and a regression of
an error message (52a47418).

The short-ish version of what motivates this patch is:

- It's hard to write a good error message in the init method,
  because we need to determine the context of our caller to do so.
  It's easier to just let the caller write the message.
- We don't want to allow QAPISourceInfo(None, None, None) to exist. The
  typing introduced by commit f5d4361c types the 'fname' field as
  (non-optional) str, which was premature until the removal of this
  construct.
- Errors made using such an object are currently incorrect (since
  52a47418)
- It's not technically a semantic error if we cannot open the schema.
- There are various typing constraints that make mixing these two cases
  undesirable for a single special case.
- test-qapi's code handling an fname of 'None' is now dead, drop it.
  Additionally, Not all QAPIError objects have an 'info' field (since
  46f49468), so deleting this stanza corrects a typing oversight in
  test-qapi introduced by that commit.

Other considerations:

- open() is moved to a 'with' block to ensure file pointers are
  cleaned up deterministically.
- Python 3.3 deprecated IOError and made it a synonym for OSError.
  Avoid the misleading perception these exception handlers are
  narrower than they really are.

The long version:

The error message here is incorrect (since commit 52a47418):

> python3 qapi-gen.py 'fake.json'
qapi-gen.py: qapi-gen.py: can't read schema file 'fake.json': No such file or directory

In pursuing it, we find that QAPISourceInfo has a special accommodation
for when there's no filename. Meanwhile, the intent when QAPISourceInfo
was typed (f5d4361c) was non-optional 'str'. This usage was
overlooked.

To remove this, I'd want to avoid having a "fake" QAPISourceInfo
object. I also don't want to explicitly begin accommodating
QAPISourceInfo itself being None, because we actually want to eventually
prove that this can never happen -- We don't want to confuse "The file
isn't open yet" with "This error stems from a definition that wasn't
defined in any file".

(An earlier series tried to create a dummy info object, but it was tough
to prove in review that it worked correctly without creating new
regressions. This patch avoids that distraction. We would like to first
prove that we never raise QAPISemError for any built-in object before we
add "special" info objects. We aren't ready to do that yet.)

So, which way out of the labyrinth?

Here's one way: Don't try to handle errors at a level with "mixed"
semantic contexts; i.e. don't mix inclusion errors (should report a
source line where the include was triggered) and command line errors
(where we specified a file we couldn't read).

Remove the error handling from the initializer of the parser. Pythonic!
Now it's the caller's job to figure out what to do about it. Handle the
error in QAPISchemaParser._include() instead, where we can write a
targeted error message where we are guaranteed to have an 'info' context
to report with.

The root level error can similarly move to QAPISchema.__init__(), where
we know we'll never have an info context to report with, so we use a
more abstract error type.

Now the error looks sensible again:

> python3 qapi-gen.py 'fake.json'
qapi-gen.py: can't read schema file 'fake.json': No such file or directory

With these error cases separated, QAPISourceInfo can be solidified as
never having placeholder arguments that violate our desired types. Clean
up test-qapi along similar lines.

Signed-off-by: John Snow <jsnow@redhat.com>
Message-Id: <20210519183951.3946870-2-jsnow@redhat.com>
Reviewed-by: Markus Armbruster <armbru@redhat.com>
Signed-off-by: Markus Armbruster <armbru@redhat.com>

Merge remote-tracking branch 'remotes/stsquad/tags/pull-testing-and-plugin-updates-180521-2' into staging

testing and plugin updates:

  - various fixes for binfmt_misc docker images
  - add hexagon check-tcg support docker image
  - add tricore check-tcg support
  - refactor ppc docker images
  - add missing ppc64le tests
  - don't use host_cc for test fallback
  - check-tcg configure.sh tweaks for cross compile/clang
  - fix some memory leaks in plugins

# gpg: Signature made Tue 18 May 2021 09:37:21 BST
# gpg:                using RSA key 6685AE99E75167BCAFC8DF35FBD0DB095A9E2A44
# gpg: Good signature from "Alex Bennée (Master Work Key) <alex.bennee@linaro.org>" [full]
# Primary key fingerprint: 6685 AE99 E751 67BC AFC8  DF35 FBD0 DB09 5A9E 2A44

* remotes/stsquad/tags/pull-testing-and-plugin-updates-180521-2: (29 commits)
  configure: use cc, not host_cc to set cross_cc for build arch
  tests/tcg: don't allow clang as a cross compiler
  tests/tcg: fix missing return
  tests/tcg/ppc64le: tests for brh/brw/brd
  tests/docker: gcc-10 based images for ppc64{,le} tests
  tests/tcg/tricore: Add muls test
  tests/tcg/tricore: Add msub test
  tests/tcg/tricore: Add madd test
  tests/tcg/tricore: Add ftoi test
  tests/tcg/tricore: Add fmul test
  tests/tcg/tricore: Add fadd test
  tests/tcg/tricore: Add dvstep test
  tests/tcg/tricore: Add clz test
  tests/tcg/tricore: Add bmerge test
  tests/tcg/tricore: Add macros to create tests and first test 'abs'
  configure: Emit HOST_CC to config-host.mak
  tests/tcg/tricore: Add build infrastructure
  hw/tricore: Add testdevice for tests in tests/tcg/
  tests/tcg: Run timeout cmds using --foreground
  tests/tcg: Add docker_as and docker_ld cmds
  ...

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>

ppc patch queue 2021-05-19

Next set of ppc related patches for qemu-6.1.  Highlights are:
 * Start of a significant softmmu cleanup from Richard Henderson
 * Further work towards allowing builds without CONFIG_TCG

# gpg: Signature made Wed 19 May 2021 13:36:45 BST
# gpg:                using RSA key 75F46586AE61A66CC44E87DC6C38CACA20D9B392
# gpg: Good signature from "David Gibson <david@gibson.dropbear.id.au>" [full]
# gpg:                 aka "David Gibson (Red Hat) <dgibson@redhat.com>" [full]
# gpg:                 aka "David Gibson (ozlabs.org) <dgibson@ozlabs.org>" [full]
# gpg:                 aka "David Gibson (kernel.org) <dwg@kernel.org>" [unknown]
# Primary key fingerprint: 75F4 6586 AE61 A66C C44E  87DC 6C38 CACA 20D9 B392

* remotes/dg-gitlab/tags/ppc-for-6.1-20210519: (48 commits)
  target/ppc: Remove type argument for mmubooke206_get_physical_address
  target/ppc: Remove type argument from mmubooke206_check_tlb
  target/ppc: Remove type argument from mmubooke_get_physical_address
  target/ppc: Remove type argument from mmubooke_check_tlb
  target/ppc: Remove type argument from mmu40x_get_physical_address
  target/ppc: Remove type argument from get_bat_6xx_tlb
  target/ppc: Remove type argument from ppc6xx_tlb_check
  target/ppc: Remove type argument from ppc6xx_tlb_pte_check
  target/ppc: Remove type argument from check_prot
  target/ppc: Use MMUAccessType in mmu_helper.c
  target/ppc: Rename access_type to type in mmu_helper.c
  target/ppc: Use MMUAccessType in mmu-hash32.c
  target/ppc: Use MMUAccessType in mmu-hash64.c
  target/ppc: Use MMUAccessType in mmu-radix64.c
  target/ppc: Introduce prot_for_access_type
  target/ppc: Fix load endianness for lxvwsx/lxvdsx
  target/ppc: Use translator_loop_temp_check
  target/ppc: Mark helper_raise_exception* as noreturn
  target/ppc: Tidy exception vs exit_tb
  target/ppc: Move single-step check to ppc_tr_tb_stop
  ...

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>

With the previous patch for check_io, we now have enough for
the compiler to dead-code eliminate all of the i/o helpers.

Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Reviewed-by: Paolo Bonzini <pbonzini@redhat.com>
Message-Id: <20210514151342.384376-51-richard.henderson@linaro.org>

The we never allow i/o from user-only, and the tss check
that helper_check_io does will always fail.  Use an ifdef
within gen_check_io and return false, indicating that an
exception is known to be raised.

Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Reviewed-by: Paolo Bonzini <pbonzini@redhat.com>
Message-Id: <20210514151342.384376-50-richard.henderson@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>

Drop helper_check_io[bwl] and expose their common
subroutine to tcg directly.

Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Message-Id: <20210514151342.384376-49-richard.henderson@linaro.org>

Pass in a pre-truncated TCGv_i32 value.  We were doing the
truncation of EDX in multiple places, now only once per insn.
While all callers use s->tmp2_i32, for cleanliness of the
subroutine, use a parameter anyway.

Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Reviewed-by: Paolo Bonzini <pbonzini@redhat.com>
Message-Id: <20210514151342.384376-48-richard.henderson@linaro.org>

Get cur_eip from DisasContext.  Do not require the caller
to use svm_is_rep; get prefix from DisasContext.  Use the
proper symbolic constants for SVM_IOIO_*.

While we're touching all call sites, return bool in
preparation for gen_check_io raising #GP.

Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Reviewed-by: Paolo Bonzini <pbonzini@redhat.com>
Message-Id: <20210514151342.384376-47-richard.henderson@linaro.org>

At minimum, wrmsr can change efer, which affects HF_LMA.

Cc: qemu-stable@nongnu.org
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Reviewed-by: Paolo Bonzini <pbonzini@redhat.com>
Message-Id: <20210514151342.384376-46-richard.henderson@linaro.org>

Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Reviewed-by: Paolo Bonzini <pbonzini@redhat.com>
Message-Id: <20210514151342.384376-45-richard.henderson@linaro.org>

The user-version is a no-op.  This lets us completely
remove tcg/user/svm_stubs.c.

Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Reviewed-by: Paolo Bonzini <pbonzini@redhat.com>
Message-Id: <20210514151342.384376-44-richard.henderson@linaro.org>