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authorArtem Pisarenko <artem.k.pisarenko@gmail.com>2018-10-17 14:24:18 +0600
committerPaolo Bonzini <pbonzini@redhat.com>2018-10-19 13:44:03 +0200
commit05ff8dc32fa124e7bbf77a257f863f3685c7be9d (patch)
treee1d4c0de2c3da6e3beae71653352086e73f9f671 /device-hotplug.c
parent24f7973b67dd6036f0c193a92d265722911a620a (diff)
Revert some patches from recent [PATCH v6] "Fixing record/replay and adding reverse debugging"
That patch series introduced new virtual clock type for use in external subsystems. It breaks desired behavior in non-record/replay usage scenarios due to a small change to existing behavior. Processing of virtual timers belonging to new clock type is kicked off to the main loop, which makes these timers asynchronous with vCPU thread and, in icount mode, with whole guest execution. This breaks expected determinism in non-record/replay icount mode of emulation where these "external subsystems" are isolated from the host (i.e. they are external only to guest core, not to the entire emulation environment). Example for slirp ("user" backend for network device): User runs qemu in icount mode with rtc clock=vm without any external communication interfaces but with "-netdev user,restrict=on". It expects deterministic execution, because network services are emulated inside qemu and isolated from host. There are no reasons to get reply from DHCP server with different delay or something like that. The next patches revert reimplements the same changes in a better way. This reverts commit 87f4fe7653baf55b5c2f2753fe6003f473c07342. This reverts commit 775a412bf83f6bc0c5c02091ee06cf649b34c593. This reverts commit 9888091404a702d7ec79d51b088d994b9fc121bd. Signed-off-by: Artem Pisarenko <artem.k.pisarenko@gmail.com> Message-Id: <18b1e7c8f155fe26976f91be06bde98eef6f8751.1539764043.git.artem.k.pisarenko@gmail.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Diffstat (limited to 'device-hotplug.c')
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