linux-kernel - Re: [RFC PATCH 04/16] RISC-V: KVM: Implement VCPU create, init and destroy functions

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Date:   Tue, 30 Jul 2019 10:48:36 +0200
From:   Paolo Bonzini <pbonzini@...hat.com>
To:     Anup Patel <Anup.Patel@....com>,
        Palmer Dabbelt <palmer@...ive.com>,
        Paul Walmsley <paul.walmsley@...ive.com>,
        Radim K <rkrcmar@...hat.com>
Cc:     Daniel Lezcano <daniel.lezcano@...aro.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Atish Patra <Atish.Patra@....com>,
        Alistair Francis <Alistair.Francis@....com>,
        Damien Le Moal <Damien.LeMoal@....com>,
        Christoph Hellwig <hch@...radead.org>,
        Anup Patel <anup@...infault.org>,
        "kvm@...r.kernel.org" <kvm@...r.kernel.org>,
        "linux-riscv@...ts.infradead.org" <linux-riscv@...ts.infradead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [RFC PATCH 04/16] RISC-V: KVM: Implement VCPU create, init and
 destroy functions

On 29/07/19 13:56, Anup Patel wrote:
> +	cntx->hstatus |= HSTATUS_SP2V;
> +	cntx->hstatus |= HSTATUS_SP2P;

IIUC, cntx->hstatus's SP2P bit contains the guest's sstatus.SPP bit?  I
suggest adding a comment here, and again providing a ONE_REG interface
to sstatus so that the ABI is final before RISC-V KVM is merged.

What happens if the guest executes SRET?  Is that EXC_SYSCALL in hedeleg?

(BTW the name of SP2V and SP2P is horrible, I think HPV/HPP or HSPV/HSPP
would have been clearer, but that's not your fault).

Paolo

> +	cntx->hstatus |= HSTATUS_SPV;