From 6a8ff6daefc670455f40326afd53b51b632a32dc Mon Sep 17 00:00:00 2001 From: Andrei Vagin Date: Mon, 15 Jul 2019 19:26:16 -0700 Subject: kvm: wake up all waiter of vCPU.state Now we call FUTEX_WAKE with ^uintptr(0) of waiters, but in this case only one waiter will be waked up. If we want to wake up all of them, the number of waiters has to be set to math.MaxInt32. PiperOrigin-RevId: 258285286 --- pkg/sentry/platform/kvm/machine_unsafe.go | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/pkg/sentry/platform/kvm/machine_unsafe.go b/pkg/sentry/platform/kvm/machine_unsafe.go index 8d76e106e..405e00292 100644 --- a/pkg/sentry/platform/kvm/machine_unsafe.go +++ b/pkg/sentry/platform/kvm/machine_unsafe.go @@ -21,6 +21,7 @@ package kvm import ( "fmt" + "math" "sync/atomic" "syscall" "unsafe" @@ -134,7 +135,7 @@ func (c *vCPU) notify() { syscall.SYS_FUTEX, uintptr(unsafe.Pointer(&c.state)), linux.FUTEX_WAKE|linux.FUTEX_PRIVATE_FLAG, - ^uintptr(0), // Number of waiters. + math.MaxInt32, // Number of waiters. 0, 0, 0) if errno != 0 { throw("futex wake error") -- cgit v1.2.3