linux-kernel - Re: [PATCH 2/3] KVM: X86: Implement PV sched yield hypercall

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Message-ID: <0b8525d8-e26b-e4df-508d-b6a4d9c06a76@redhat.com>
Date:   Mon, 27 May 2019 13:53:58 +0200
From:   Paolo Bonzini <pbonzini@...hat.com>
To:     Wanpeng Li <kernellwp@...il.com>, linux-kernel@...r.kernel.org,
        kvm@...r.kernel.org
Cc:     Radim Krčmář <rkrcmar@...hat.com>
Subject: Re: [PATCH 2/3] KVM: X86: Implement PV sched yield hypercall

On 27/05/19 12:34, Wanpeng Li wrote:
> +	rcu_read_lock();
> +	map = rcu_dereference(kvm->arch.apic_map);
> +	target = map->phys_map[dest_id]->vcpu;
> +	rcu_read_unlock();
> +
> +	kvm_vcpu_yield_to(target);

This needs to check that map->phys_map[dest_id] is not NULL.

Paolo