linux-kernel - Re: [RFC PATCH 15/16] RISC-V: KVM: Add SBI v0.1 support

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Date:   Mon, 29 Jul 2019 19:51:00 +0000
From:   Atish Patra <Atish.Patra@....com>
To:     "paul.walmsley@...ive.com" <paul.walmsley@...ive.com>,
        "rkrcmar@...hat.com" <rkrcmar@...hat.com>,
        "pbonzini@...hat.com" <pbonzini@...hat.com>,
        "palmer@...ive.com" <palmer@...ive.com>,
        Anup Patel <Anup.Patel@....com>
CC:     "linux-riscv@...ts.infradead.org" <linux-riscv@...ts.infradead.org>,
        "daniel.lezcano@...aro.org" <daniel.lezcano@...aro.org>,
        Alistair Francis <Alistair.Francis@....com>,
        Damien Le Moal <Damien.LeMoal@....com>,
        "hch@...radead.org" <hch@...radead.org>,
        "tglx@...utronix.de" <tglx@...utronix.de>,
        "anup@...infault.org" <anup@...infault.org>,
        "kvm@...r.kernel.org" <kvm@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [RFC PATCH 15/16] RISC-V: KVM: Add SBI v0.1 support

On Mon, 2019-07-29 at 21:40 +0200, Paolo Bonzini wrote:
> On 29/07/19 13:57, Anup Patel wrote:
> > +	csr_write(CSR_HSTATUS, vcpu->arch.guest_context.hstatus |
> > HSTATUS_SPRV);
> > +	csr_write(CSR_SSTATUS, vcpu->arch.guest_context.sstatus);
> > +	val = *addr;
> 
> What happens if this load faults?
> 

It should redirect the trap back to VS mode. Currently, it is not
implemented. It is on the TO-DO list for future iteration of the
series.

Regards,
Atish
> Paolo