Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) client-ip=2620:137:e000::1:20;
Message-ID: <2543a6aa-adc0-b471-6281-38130b4d6a08@linux.microsoft.com>
Date:   Tue, 4 Apr 2023 10:00:15 -0700
MIME-Version: 1.0
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:102.0) Gecko/20100101
 Thunderbird/102.9.1
Subject: Re: [PATCH] PCI: hv: Use nested hypercall for retargeting interrupts
Content-Language: en-US
To:     Jinank Jain <jinankjain@linux.microsoft.com>,
        jinankjain@microsoft.com, kys@microsoft.com,
        haiyangz@microsoft.com, wei.liu@kernel.org, decui@microsoft.com,
        lpieralisi@kernel.org, kw@linux.com, robh@kernel.org,
        bhelgaas@google.com
Cc:     linux-hyperv@vger.kernel.org, linux-pci@vger.kernel.org,
        linux-kernel@vger.kernel.org
References: <20230404113546.856813-1-jinankjain@linux.microsoft.com>
From:   Nuno Das Neves <nunodasneves@linux.microsoft.com>
In-Reply-To: <20230404113546.856813-1-jinankjain@linux.microsoft.com>
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 7bit
Precedence: bulk

Reviewed-by: Nuno Das Neves <nunodasneves@linux.microsoft.com>

On 4/4/2023 4:35 AM, Jinank Jain wrote:
> In case of nested MSHV, retargeting interrupt hypercall should be sent
> to L0 hypervisor instead of L1 hypervisor.
> 
> Signed-off-by: Jinank Jain <jinankjain@linux.microsoft.com>
> ---
>  drivers/pci/controller/pci-hyperv.c | 10 ++++++++--
>  1 file changed, 8 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/pci/controller/pci-hyperv.c b/drivers/pci/controller/pci-hyperv.c
> index f33370b75628..2123f632ecf7 100644
> --- a/drivers/pci/controller/pci-hyperv.c
> +++ b/drivers/pci/controller/pci-hyperv.c
> @@ -704,8 +704,14 @@ static void hv_arch_irq_unmask(struct irq_data *data)
>  		}
>  	}
>  
> -	res = hv_do_hypercall(HVCALL_RETARGET_INTERRUPT | (var_size << 17),
> -			      params, NULL);
> +	if (hv_nested)
> +		res = hv_do_nested_hypercall(HVCALL_RETARGET_INTERRUPT |
> +					     (var_size << 17),
> +					     params, NULL);
> +	else
> +		res = hv_do_hypercall(HVCALL_RETARGET_INTERRUPT |
> +				      (var_size << 17),
> +				      params, NULL);
>  
>  exit_unlock:
>  	spin_unlock_irqrestore(&hbus->retarget_msi_interrupt_lock, flags);