linux-kernel - Re: [PATCH] KVM: hyperv: idr

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Message-ID: <20180508173550.GD2184@rkaganb.sw.ru>
Date:   Tue, 8 May 2018 20:35:51 +0300
From:   Roman Kagan <rkagan@...tuozzo.com>
To:     Paolo Bonzini <pbonzini@...hat.com>
Cc:     linux-kernel@...r.kernel.org, kvm@...r.kernel.org,
        Thomas Avery <tavery321@...il.com>
Subject: Re: [PATCH] KVM: hyperv: idr_find needs RCU protection

On Mon, May 07, 2018 at 07:25:00PM +0200, Paolo Bonzini wrote:
> Even though the eventfd is released after the KVM SRCU grace period
> elapses, the conn_to_evt data structure itself is not; it uses RCU
> internally, instead.  Fix the read-side critical section to happen
> under rcu_read_lock/unlock; the result is still protected by
> vcpu->kvm->srcu.
> 
> Signed-off-by: Paolo Bonzini <pbonzini@...hat.com>
> ---
>  arch/x86/kvm/hyperv.c | 4 +++-
>  1 file changed, 3 insertions(+), 1 deletion(-)

Reviewed-by: Roman Kagan <rkagan@...tuozzo.com>