mirror of
https://github.com/Motorhead1991/qemu.git
synced 2025-12-28 02:00:34 -07:00
ef149763a8
The drain_rcu_call() function can be blocked as long as an RCU reader stays in a read-side critical section. This is typically what happens when a TCG vCPU is executing a busy loop. It can deadlock the QEMU monitor as reported in https://gitlab.com/qemu-project/qemu/-/issues/650 . This can be avoided by allowing drain_rcu_call() to enforce an RCU grace period. Since each reader might need to do specific actions to end a read-side critical section, do it with notifiers. Prepare ground for this by adding a notifier list to the RCU reader struct and use it in wait_for_readers() if drain_rcu_call() is in progress. An API is added for readers to register their notifiers. This is largely based on a draft from Paolo Bonzini. Suggested-by: Paolo Bonzini <pbonzini@redhat.com> Signed-off-by: Greg Kurz <groug@kaod.org> Reviewed-by: Richard Henderson <richard.henderson@linaro.org> Message-Id: <20211109183523.47726-2-groug@kaod.org> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> |
||
|---|---|---|
| .. | ||
| authz | ||
| block | ||
| chardev | ||
| crypto | ||
| disas | ||
| exec | ||
| fpu | ||
| hw | ||
| io | ||
| libdecnumber | ||
| migration | ||
| monitor | ||
| net | ||
| qapi | ||
| qemu | ||
| qom | ||
| scsi | ||
| semihosting | ||
| standard-headers | ||
| sysemu | ||
| tcg | ||
| ui | ||
| user | ||
| elf.h | ||
| glib-compat.h | ||
| qemu-common.h | ||
| qemu-io.h | ||
| trace-tcg.h | ||