linux-kernel - Re: [PATCH v3 1/2] RISC-V: KVM: Fix privilege mode setting in kvm_riscv_vcpu_trap

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Message-ID: <20230128130836.4ujqmzfqlfpcekni@orel>
Date:   Sat, 28 Jan 2023 14:08:36 +0100
From:   Andrew Jones <ajones@...tanamicro.com>
To:     Anup Patel <apatel@...tanamicro.com>
Cc:     Paolo Bonzini <pbonzini@...hat.com>,
        Atish Patra <atishp@...shpatra.org>,
        Palmer Dabbelt <palmer@...belt.com>,
        Paul Walmsley <paul.walmsley@...ive.com>,
        Anup Patel <anup@...infault.org>, kvm@...r.kernel.org,
        kvm-riscv@...ts.infradead.org, linux-riscv@...ts.infradead.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 1/2] RISC-V: KVM: Fix privilege mode setting in
 kvm_riscv_vcpu_trap_redirect()

On Sat, Jan 28, 2023 at 01:58:46PM +0530, Anup Patel wrote:
> The kvm_riscv_vcpu_trap_redirect() should set guest privilege mode
> to supervisor mode because guest traps/interrupts are always handled
> in virtual supervisor mode.
> 
> Fixes: 9f7013265112 ("RISC-V: KVM: Handle MMIO exits for VCPU")
> Signed-off-by: Anup Patel <apatel@...tanamicro.com>
> ---
>  arch/riscv/kvm/vcpu_exit.c | 3 +++
>  1 file changed, 3 insertions(+)
> 
> diff --git a/arch/riscv/kvm/vcpu_exit.c b/arch/riscv/kvm/vcpu_exit.c
> index c9f741ab26f5..af7c4bc07929 100644
> --- a/arch/riscv/kvm/vcpu_exit.c
> +++ b/arch/riscv/kvm/vcpu_exit.c
> @@ -160,6 +160,9 @@ void kvm_riscv_vcpu_trap_redirect(struct kvm_vcpu *vcpu,
>  
>  	/* Set Guest PC to Guest exception vector */
>  	vcpu->arch.guest_context.sepc = csr_read(CSR_VSTVEC);
> +
> +	/* Set Guest privilege mode to supervisor */
> +	vcpu->arch.guest_context.sstatus |= SR_SPP;
>  }
>  
>  /*
> -- 
> 2.34.1
>

Reviewed-by: Andrew Jones <ajones@...tanamicro.com>

Thanks,
drew