[libvirt PATCH] meson: stop CLang doing inter-procedural analysis
by Daniel P. Berrangé
The virNumaNodeIsAvailable function is stubbed out when building
without libnuma, such that it just returns a constant value. When
CLang is optimizing, it does inter-procedural analysis across
function calls. When it sees that the call to virNumaNodeIsAvailable
returns a fixed constant, it elides the conditional check for errors
in the callers such as virNumaNodesetIsAvailable.
This is a valid optimization as the C standard declares that there
must only be one implementation of each function in a binary. This
is normally the case, but ELF allows for function overrides when
linking or at runtime with LD_PRELOAD, which is technically outside
the mandated C language behaviour.
So while CLang's optimization works fine at runtime, it breaks in our
test suite which aims to mock the virNumaNodeIsAvailable function so
that it has specific semantics regardless of whether libnuma is built
or not. The return value check optimization though means our mock
override won't have the right effect. The mock will be invoked, but
its return value is not used.
Potentially the same problem could be exhibited with GCC if certain
combinations of optimizations are enabled, though thus far we've
not seen it.
To be robust on both CLang and GCC we need to make it more explicit
that we want to be able to replace functions and thus optimization
of calls must be limited. Currently we rely on 'noinline' which
does succesfully prevent inlining of the function, but it cannot
stop the eliding of checks based on the constant return value.
Thus we need a bigger hammer.
There are a couple of options to disable this optimization:
* Annotate a symbol as 'weak'. This is tells the compiler
that the symbol is intended to be overridable at linktime
or runtime, and thus it will avoid doing inter-procedural
analysis for optimizations. This was tried previously but
have to be reverted as it had unintended consequences
when linking .a files into our final .so, resulting in all
the weak symbol impls being lost. See commit
407a281a8e2b6c5078ba1148535663ea64fd9314
* Annotate a symbol with 'noipa'. This tells the compiler
to avoid inter-procedural analysis for calls to just this
function. This wold be ideal match for our scenario, but
unfortunately it is only implemented for GCC currently:
https://reviews.llvm.org/D101011
* The '-fsemantic-interposition' argument tells the optimizer
that any functions may be replaced with alternative
implementations that have different semantics. It thus
blocks any optimizations across function calls. This is
quite a harsh block on the optimizer, but it appears to be
the only one that is viable with CLang.
Signed-off-by: Daniel P. Berrangé <berrange(a)redhat.com>
---
meson.build | 20 ++++++++++++++++++++
1 file changed, 20 insertions(+)
diff --git a/meson.build b/meson.build
index 319ed790f9..c35823a79a 100644
--- a/meson.build
+++ b/meson.build
@@ -404,6 +404,26 @@ cc_flags += [
'-Wwrite-strings',
]
+if cc.get_id() == 'clang'
+ # Stop CLang from doing inter-procedural analysis of calls
+ # between functions in the same compilation unit. Such an
+ # optimization has been know to break the test suite by
+ # making assumptions that a return value is a constant.
+ # This makes it impossible to mock certain functions with
+ # replacement definitions via LD_PRELOAD that have different
+ # semantics.
+ #
+ # This is a bit of a big hammer, but alternatives don't work:
+ #
+ # - 'weak' attribute - weak symbols get dropped from
+ # when the .a libs are combined into the .so
+ # see commit 407a281a8e2b6c5078ba1148535663ea64fd9314
+ #
+ # - 'noipa' attribute - only available with GCC currently
+ # https://reviews.llvm.org/D101011
+ cc_flags += [ '-fsemantic-interposition' ]
+endif
+
supported_cc_flags = []
if get_option('warning_level') == '2'
supported_cc_flags = cc.get_supported_arguments(cc_flags)
--
2.39.2
1 year, 9 months
[libvirt PATCH] manpages: fix secret injection example for SEV
by Daniel P. Berrangé
The --disk-password argument was present in early impls of the patch but
replaced by the more generic --inject-secret argument.
Signed-off-by: Daniel P. Berrangé <berrange(a)redhat.com>
---
docs/manpages/virt-qemu-sev-validate.rst | 6 +++---
1 file changed, 3 insertions(+), 3 deletions(-)
diff --git a/docs/manpages/virt-qemu-sev-validate.rst b/docs/manpages/virt-qemu-sev-validate.rst
index b1392e0a50..617ef0a57e 100644
--- a/docs/manpages/virt-qemu-sev-validate.rst
+++ b/docs/manpages/virt-qemu-sev-validate.rst
@@ -316,7 +316,7 @@ inject a disk password on success:
--api-minor 24 \
--build-id 13 \
--policy 3 \
- --disk-password passwd.txt \
+ --inject-secret 736869e5-84f0-4973-92ec-06879ce3da0b:passwd.txt \
--secret-header secret-header.b64 \
--secret-payload secret-payload.b64
@@ -393,7 +393,7 @@ inject a disk password on success:
--firmware OVMF.sev.fd \
--tk this-guest-tk.bin \
--domain fedora34x86_64 \
- --disk-password passwd.txt
+ --inject-secret 736869e5-84f0-4973-92ec-06879ce3da0b:passwd.txt
Fetch from local libvirt
------------------------
@@ -454,7 +454,7 @@ inject a disk password on success:
--insecure \
--tk this-guest-tk.bin \
--domain fedora34x86_64 \
- --disk-password passwd.txt
+ --inject-secret 736869e5-84f0-4973-92ec-06879ce3da0b:passwd.txt
COMMON MISTAKES CHECKLIST
=========================
--
2.39.2
1 year, 9 months
[libvirt PATCH] rpc: fix typo in admin code generation
by Ján Tomko
An extra '&' introduced a crash.
https://bugzilla.redhat.com/show_bug.cgi?id=2178866
Fixes: 778c3004609ede0a9df4cf3e01c031047530efb7
Signed-off-by: Ján Tomko <jtomko(a)redhat.com>
---
src/rpc/gendispatch.pl | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/src/rpc/gendispatch.pl b/src/rpc/gendispatch.pl
index b186849606..704c133215 100755
--- a/src/rpc/gendispatch.pl
+++ b/src/rpc/gendispatch.pl
@@ -1812,7 +1812,7 @@ elsif ($mode eq "client") {
}
if ($structprefix eq "admin") {
- print " VIR_LOCK_GUARD lock = virObjectLockGuard(&priv);\n";
+ print " VIR_LOCK_GUARD lock = virObjectLockGuard(priv);\n";
} else {
print " VIR_LOCK_GUARD lock = remoteDriverLock(priv);\n";
}
--
2.39.2
1 year, 9 months
[libvirt PATCH] tests: qemublocktest: fix memory leak
by Ján Tomko
Set enccount to 1, so the cleanup function knows
there is something to be cleaned up.
Fixes: 1992ae40fac90c315d0d8d1a9c6f880bd0a39b57
Signed-off-by: Ján Tomko <jtomko(a)redhat.com>
---
Pushed as a trivial build fix.
tests/qemublocktest.c | 1 +
1 file changed, 1 insertion(+)
diff --git a/tests/qemublocktest.c b/tests/qemublocktest.c
index 2d790e2b2e..9a968477d7 100644
--- a/tests/qemublocktest.c
+++ b/tests/qemublocktest.c
@@ -242,6 +242,7 @@ testQemuDiskXMLToJSONFakeSecrets(virStorageSource *src)
srcpriv->encinfo[0]->alias = g_strdup_printf("%s-encalias",
NULLSTR(src->nodeformat));
+ srcpriv->enccount = 1;
}
return 0;
--
2.39.2
1 year, 9 months
[libvirt PATCH] qemu: use correct formatting string for size_t
by Ján Tomko
Otherwise the build on armv7l breaks:
error: format ‘%lu’ expects argument of type
‘long unsigned int’, but argument 4 has type
‘size_t’ {aka ‘unsigned int’} [-Werror=format=]
Fixes: 1992ae40fac90c315d0d8d1a9c6f880bd0a39b57
Fixes: e239f7d0a86ebddf9aab3f8c8e6b6e66351485b2
Signed-off-by: Ján Tomko <jtomko(a)redhat.com>
---
Pushed as a build breaker fix.
src/qemu/qemu_alias.c | 4 ++--
src/qemu/qemu_domain.c | 2 +-
2 files changed, 3 insertions(+), 3 deletions(-)
diff --git a/src/qemu/qemu_alias.c b/src/qemu/qemu_alias.c
index d7d9be1164..85db7fbfe3 100644
--- a/src/qemu/qemu_alias.c
+++ b/src/qemu/qemu_alias.c
@@ -824,8 +824,8 @@ qemuAliasForSecret(const char *parentalias,
size_t secret_idx)
{
if (obj)
- return g_strdup_printf("%s-%s-secret%lu", parentalias, obj, secret_idx);
- return g_strdup_printf("%s-secret%lu", parentalias, secret_idx);
+ return g_strdup_printf("%s-%s-secret%zu", parentalias, obj, secret_idx);
+ return g_strdup_printf("%s-secret%zu", parentalias, secret_idx);
}
/* qemuAliasTLSObjFromSrcAlias
diff --git a/src/qemu/qemu_domain.c b/src/qemu/qemu_domain.c
index 942e5843c2..0a7b30fa65 100644
--- a/src/qemu/qemu_domain.c
+++ b/src/qemu/qemu_domain.c
@@ -2030,7 +2030,7 @@ qemuStorageSourcePrivateDataParse(xmlXPathContextPtr ctxt,
if (!(encalias = virXMLPropString(encnodes[i], "alias"))) {
virReportError(VIR_ERR_INTERNAL_ERROR,
- _("missing alias on encryption secret #%lu"), i);
+ _("missing alias on encryption secret #%zu"), i);
return -1;
}
--
2.39.2
1 year, 9 months
[libvirt PATCH 0/4] qemu: support host-phys-bits-limit
by Ján Tomko
Ján Tomko (4):
conf: cpu: add limit for maxphysaddr
qemu: add support for setting host-phys-bits-limit
qemu: do not require bits for maxphysaddr mode emulate
qemu: allow forcing emulated maxphysaddr
docs/formatdomain.rst | 10 ++++--
src/conf/cpu_conf.c | 7 ++++
src/conf/cpu_conf.h | 1 +
src/conf/schemas/cputypes.rng | 5 +++
src/qemu/qemu_command.c | 8 ++++-
src/qemu/qemu_validate.c | 7 ----
.../cpu-phys-bits-emulate-bare.xml | 20 +++++++++++
.../cpu-phys-bits-emulate3.err | 1 -
.../cpu-phys-bits-emulate3.xml | 20 -----------
.../cpu-phys-bits-limit.x86_64-latest.args | 34 +++++++++++++++++++
.../qemuxml2argvdata/cpu-phys-bits-limit.xml | 20 +++++++++++
tests/qemuxml2argvtest.c | 3 +-
...u-phys-bits-emulate-bare.x86_64-latest.xml | 31 +++++++++++++++++
.../cpu-phys-bits-limit.x86_64-latest.xml | 31 +++++++++++++++++
tests/qemuxml2xmltest.c | 3 ++
15 files changed, 169 insertions(+), 32 deletions(-)
create mode 100644 tests/qemuxml2argvdata/cpu-phys-bits-emulate-bare.xml
delete mode 100644 tests/qemuxml2argvdata/cpu-phys-bits-emulate3.err
delete mode 100644 tests/qemuxml2argvdata/cpu-phys-bits-emulate3.xml
create mode 100644 tests/qemuxml2argvdata/cpu-phys-bits-limit.x86_64-latest.args
create mode 100644 tests/qemuxml2argvdata/cpu-phys-bits-limit.xml
create mode 100644 tests/qemuxml2xmloutdata/cpu-phys-bits-emulate-bare.x86_64-latest.xml
create mode 100644 tests/qemuxml2xmloutdata/cpu-phys-bits-limit.x86_64-latest.xml
--
2.39.2
1 year, 9 months
[PATCH v2 0/7] qemu: add support for librbd layered encryption
by Or Ozeri
v2:
- add luks-any commits (including nit fixes)
- removed qemu 8.0.0 replies commit
- remove tautological if condition in qemuBlockStorageSourceAttachData initialization
- add comments on validation of a single secret in qemu encryption engine
- fix leak of qemuDomainStorageSourcePrivate->encinfo
- remove ctxt->node modification in privatedata xml parsing
- add test to modern-in.xml
- squash commit #6
- add validation for a single secret in sd card disk
Or Ozeri (7):
qemu: capabilities: Introduce QEMU_CAPS_RBD_ENCRYPTION_LAYERING
capability
qemu: add support for multiple secret aliases
qemu: add multi-secret support in qemuBlockStorageSourceAttachData
qemu: add multi-secret support in _qemuDomainStorageSourcePrivate
qemu: add support for librbd layered encryption
qemu: capabilities: Introduce QEMU_CAPS_RBD_ENCRYPTION_LUKS_ANY
capability
qemu: add luks-any encryption support for RBD images
docs/formatstorageencryption.rst | 20 ++-
src/conf/schemas/storagecommon.rng | 5 +-
src/conf/storage_encryption_conf.c | 2 +-
src/conf/storage_encryption_conf.h | 1 +
src/libvirt_private.syms | 1 +
src/qemu/qemu_alias.c | 8 +-
src/qemu/qemu_alias.h | 3 +-
src/qemu/qemu_block.c | 77 ++++++++---
src/qemu/qemu_block.h | 5 +-
src/qemu/qemu_blockjob.c | 6 +
src/qemu/qemu_capabilities.c | 4 +
src/qemu/qemu_capabilities.h | 2 +
src/qemu/qemu_command.c | 29 +++-
src/qemu/qemu_domain.c | 130 +++++++++++++++---
src/qemu/qemu_domain.h | 3 +-
src/qemu/qemu_hotplug.c | 2 +-
src/qemu/qemu_migration_params.c | 2 +-
src/qemu/qemu_validate.c | 8 ++
tests/qemublocktest.c | 7 +-
.../caps_8.0.0.x86_64.xml | 2 +
tests/qemustatusxml2xmldata/modern-in.xml | 14 ++
...k-rbd-encryption-layering.x86_64-7.2.0.err | 1 +
...rbd-encryption-layering.x86_64-latest.args | 39 ++++++
.../disk-network-rbd-encryption-layering.xml | 41 ++++++
...k-rbd-encryption-luks-any.x86_64-7.2.0.err | 1 +
...rbd-encryption-luks-any.x86_64-latest.args | 37 +++++
.../disk-network-rbd-encryption-luks-any.xml | 39 ++++++
tests/qemuxml2argvtest.c | 4 +
...-rbd-encryption-layering.x86_64-latest.xml | 46 +++++++
...-rbd-encryption-luks-any.x86_64-latest.xml | 44 ++++++
tests/qemuxml2xmltest.c | 2 +
31 files changed, 517 insertions(+), 68 deletions(-)
create mode 100644 tests/qemuxml2argvdata/disk-network-rbd-encryption-layering.x86_64-7.2.0.err
create mode 100644 tests/qemuxml2argvdata/disk-network-rbd-encryption-layering.x86_64-latest.args
create mode 100644 tests/qemuxml2argvdata/disk-network-rbd-encryption-layering.xml
create mode 100644 tests/qemuxml2argvdata/disk-network-rbd-encryption-luks-any.x86_64-7.2.0.err
create mode 100644 tests/qemuxml2argvdata/disk-network-rbd-encryption-luks-any.x86_64-latest.args
create mode 100644 tests/qemuxml2argvdata/disk-network-rbd-encryption-luks-any.xml
create mode 100644 tests/qemuxml2xmloutdata/disk-network-rbd-encryption-layering.x86_64-latest.xml
create mode 100644 tests/qemuxml2xmloutdata/disk-network-rbd-encryption-luks-any.x86_64-latest.xml
--
2.25.1
1 year, 9 months
[PULL 0/3] Misc next patches
by Daniel P. Berrangé
The following changes since commit 5cfda4ce79dd455f1726874a555260a70f84b2ec:
Merge tag 'pull-request-2023-03-13' of https://gitlab.com/thuth/qemu into staging (2023-03-13 17:09:33 +0000)
are available in the Git repository at:
https://gitlab.com/berrange/qemu tags/misc-next-pull-request
for you to fetch changes up to c3a2c84ae3c1d5483ec30731321a674797dc5203:
io/channel-tls: plug memory leakage on GSource (2023-03-14 13:41:21 +0000)
----------------------------------------------------------------
Miscellaneous fixes
* Avoid memory leak in TLS GSource usage
* Avoid sending key releases for lang1/lang2 keys in ps2 keyboard
* Add missing key name constants for F13-F24 keys
----------------------------------------------------------------
Matheus Tavares Bernardino (1):
io/channel-tls: plug memory leakage on GSource
Ross Lagerwall (1):
ps2: Don't send key release event for Lang1, Lang2 keys
Willem van de Velde (1):
Add qemu qcode support for keys F13 to F24
hw/input/ps2.c | 6 ++++++
io/channel-tls.c | 1 +
qapi/ui.json | 15 ++++++++++++++-
ui/keycodemapdb | 2 +-
4 files changed, 22 insertions(+), 2 deletions(-)
--
2.39.2
1 year, 9 months
unsubscribe
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--
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--
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http://metztli.it
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1 year, 9 months
[libvirt PATCH 0/2] docs: clarify --timeout description in manpages
by Ján Tomko
The reference to running domains is not true for most of the daemons.
virtlxcd(8) and virtqemud(8) are left untouched.
Ján Tomko (2):
docs: clarify --timeout description for split daemons
docs: clarify --timeout description for virtsecretd
docs/manpages/virtbhyved.rst | 4 ++--
docs/manpages/virtinterfaced.rst | 4 ++--
docs/manpages/virtnetworkd.rst | 4 ++--
docs/manpages/virtnodedevd.rst | 4 ++--
docs/manpages/virtnwfilterd.rst | 4 ++--
docs/manpages/virtproxyd.rst | 4 ++--
docs/manpages/virtsecretd.rst | 2 +-
docs/manpages/virtstoraged.rst | 4 ++--
docs/manpages/virtvboxd.rst | 4 ++--
docs/manpages/virtvzd.rst | 4 ++--
10 files changed, 19 insertions(+), 19 deletions(-)
--
2.39.2
1 year, 9 months
