linux-kernel - Re: [PATCH v2 9/9] KVM: mark requests that need synchronization

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Date:   Thu, 27 Apr 2017 14:36:04 +0200
From:   Paolo Bonzini <pbonzini@...hat.com>
To:     Radim Krčmář <rkrcmar@...hat.com>,
        linux-kernel@...r.kernel.org, kvm@...r.kernel.org
Cc:     Christoffer Dall <cdall@...aro.org>,
        Andrew Jones <drjones@...hat.com>,
        Marc Zyngier <marc.zyngier@....com>,
        Christian Borntraeger <borntraeger@...ibm.com>,
        Cornelia Huck <cornelia.huck@...ibm.com>,
        James Hogan <james.hogan@...tec.com>,
        Paul Mackerras <paulus@...abs.org>
Subject: Re: [PATCH v2 9/9] KVM: mark requests that need synchronization



On 26/04/2017 22:32, Radim Krčmář wrote:
>  v2: replaces [v1 1/6]
>      Ugh, KVM_ARCH_REQ_WAIT_NO_WAKEUP looks a weird ...

Yeah, let's drop patch 7 and just use bits for now.  I think using
KVM_ARCH_REQ_FLAGS directly should be fine, especially after the default
is flipped from "no wakeup" to "wakeup", but for 4.12 this is the
simplest incremental step.

> +/* TODO: merge with kvm_arch_vcpu_should_kick */
> +static bool kvm_should_kick_request(struct kvm_vcpu *vcpu, unsigned req)

I'm renaming this to kvm_request_needs_ipi; the point of the IPI for
synchronous requests is not the "kick", but the "ack" that comes back.

Paolo

> +{
> +	int mode = kvm_vcpu_exiting_guest_mode(vcpu);
> +
> +	return req & KVM_REQUEST_WAIT ?
> +		mode != OUTSIDE_GUEST_MODE : mode == IN_GUEST_MODE;
> +}
> +