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From cb9a84154c755daf0c9361346302ad41a1804ecc Mon Sep 17 00:00:00 2001
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From: Peter Xu <peterx@redhat.com>
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Date: Thu, 8 Nov 2018 06:29:32 +0000
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Subject: [PATCH 04/35] qemu-error: introduce {error|warn}_report_once
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MIME-Version: 1.0
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Content-Type: text/plain; charset=UTF-8
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Content-Transfer-Encoding: 8bit
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RH-Author: Peter Xu <peterx@redhat.com>
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Message-id: <20181108062938.21143-2-peterx@redhat.com>
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Patchwork-id: 82959
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O-Subject: [RHEL-8 qemu-kvm PATCH 1/7] qemu-error: introduce {error|warn}_report_once
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Bugzilla: 1625173
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RH-Acked-by: Auger Eric <eric.auger@redhat.com>
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RH-Acked-by: Michael S. Tsirkin <mst@redhat.com>
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RH-Acked-by: Philippe Mathieu-Daudé <philmd@redhat.com>
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RH-Acked-by: Laurent Vivier <lvivier@redhat.com>
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Bugzilla: 1625173
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There are many error_report()s that can be used in frequently called
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functions, especially on IO paths. That can be unideal in that
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malicious guest can try to trigger the error tons of time which might
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use up the log space on the host (e.g., libvirt can capture the stderr
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of QEMU and put it persistently onto disk). In VT-d emulation code, we
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have trace_vtd_error() tracer. AFAIU all those places can be replaced
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by something like error_report() but trace points are mostly used to
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avoid the DDOS attack that mentioned above. However using trace points
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mean that errors are not dumped if trace not enabled.
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It's not a big deal in most modern server managements since we have
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things like logrotate to maintain the logs and make sure the quota is
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expected. However it'll still be nice that we just provide another way
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to restrict message generations. In most cases, this kind of
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error_report()s will only provide valid information on the first message
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sent, and all the rest of similar messages will be mostly talking about
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the same thing. This patch introduces *_report_once() helpers to allow
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a message to be dumped only once during one QEMU process's life cycle.
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It will make sure: (1) it's on by deffault, so we can even get something
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without turning the trace on and reproducing, and (2) it won't be
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affected by DDOS attack.
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To implement it, I stole the printk_once() macro from Linux.
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CC: Eric Blake <eblake@redhat.com>
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CC: Markus Armbruster <armbru@redhat.com>
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Signed-off-by: Peter Xu <peterx@redhat.com>
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Message-Id: <20180815095328.32414-2-peterx@redhat.com>
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Reviewed-by: Markus Armbruster <armbru@redhat.com>
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[Whitespace adjusted, comments improved]
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Signed-off-by: Markus Armbruster <armbru@redhat.com>
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(cherry picked from commit bc6a69dd4bfa41ae56235dcbb9a28a56e12a7dc6)
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Signed-off-by: Peter Xu <peterx@redhat.com>
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Signed-off-by: Danilo C. L. de Paula <ddepaula@redhat.com>
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---
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include/qemu/error-report.h | 32 ++++++++++++++++++++++++++++++++
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1 file changed, 32 insertions(+)
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diff --git a/include/qemu/error-report.h b/include/qemu/error-report.h
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index e1c8ae1..72fab2b 100644
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--- a/include/qemu/error-report.h
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+++ b/include/qemu/error-report.h
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@@ -44,6 +44,38 @@ void error_report(const char *fmt, ...) GCC_FMT_ATTR(1, 2);
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void warn_report(const char *fmt, ...) GCC_FMT_ATTR(1, 2);
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void info_report(const char *fmt, ...) GCC_FMT_ATTR(1, 2);
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+/*
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+ * Similar to error_report(), except it prints the message just once.
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+ * Return true when it prints, false otherwise.
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+ */
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+#define error_report_once(fmt, ...) \
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+ ({ \
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+ static bool print_once_; \
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+ bool ret_print_once_ = !print_once_; \
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+ \
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+ if (!print_once_) { \
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+ print_once_ = true; \
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+ error_report(fmt, ##__VA_ARGS__); \
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+ } \
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+ unlikely(ret_print_once_); \
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+ })
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+
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+/*
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+ * Similar to warn_report(), except it prints the message just once.
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+ * Return true when it prints, false otherwise.
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+ */
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+#define warn_report_once(fmt, ...) \
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+ ({ \
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+ static bool print_once_; \
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
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+ bool ret_print_once_ = !print_once_; \
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
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+ \
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
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+ if (!print_once_) { \
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
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+ print_once_ = true; \
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
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+ warn_report(fmt, ##__VA_ARGS__); \
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
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+ } \
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
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+ unlikely(ret_print_once_); \
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
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+ })
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
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+
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
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const char *error_get_progname(void);
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
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extern bool enable_timestamp_msg;
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
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--
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
ae23c9 |
1.8.3.1
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
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