linux-kernel - Re: [PATCH v9 14/27] gunyah: vm_mgr: Add ioctls to support basic non-proxy VM boot

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Message-ID: <3fd29474-eed2-3651-15d6-f1725500d7b9@quicinc.com>
Date:   Mon, 30 Jan 2023 13:44:21 -0800
From:   Elliot Berman <quic_eberman@...cinc.com>
To:     Srivatsa Vaddagiri <quic_svaddagi@...cinc.com>
CC:     Bjorn Andersson <quic_bjorande@...cinc.com>,
        Alex Elder <elder@...aro.org>,
        Murali Nalajala <quic_mnalajal@...cinc.com>,
        Trilok Soni <quic_tsoni@...cinc.com>,
        Carl van Schaik <quic_cvanscha@...cinc.com>,
        Prakruthi Deepak Heragu <quic_pheragu@...cinc.com>,
        Dmitry Baryshkov <dmitry.baryshkov@...aro.org>,
        Arnd Bergmann <arnd@...db.de>,
        "Greg Kroah-Hartman" <gregkh@...uxfoundation.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Jonathan Corbet <corbet@....net>,
        Bagas Sanjaya <bagasdotme@...il.com>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will@...nel.org>, Marc Zyngier <maz@...nel.org>,
        Jassi Brar <jassisinghbrar@...il.com>,
        Sudeep Holla <sudeep.holla@....com>,
        <linux-arm-msm@...r.kernel.org>, <devicetree@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, <linux-doc@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH v9 14/27] gunyah: vm_mgr: Add ioctls to support basic
 non-proxy VM boot



On 1/30/2023 12:53 AM, Srivatsa Vaddagiri wrote:
> * Elliot Berman <quic_eberman@...cinc.com> [2023-01-20 14:46:13]:
> 
>> +static int gh_vm_start(struct gunyah_vm *ghvm)
>> +{
>> +	struct gunyah_vm_memory_mapping *mapping;
>> +	u64 dtb_offset;
>> +	u32 mem_handle;
>> +	int ret;
>> +
>> +	down_write(&ghvm->status_lock);
>> +	if (ghvm->vm_status != GH_RM_VM_STATUS_NO_STATE) {
>> +		up_write(&ghvm->status_lock);
>> +		return 0;
> 
> return -EINVAL in this case.
> 
> Additionally check if its already GH_RM_VM_STATUS_READY and return 0 in that
> case.
> 
> [snip]
> 

Caller can use gh_vm_ensure_started for this behavior. I'll move this to 
be used in the GH_VM_RUN ioctl as well.

> 
>> +	mem_handle = mapping->parcel.mem_handle;
>> +	dtb_offset = ghvm->dtb_config.gpa - mapping->guest_phys_addr;
>> +
>> +	ret = gh_rm_vm_configure(ghvm->rm, ghvm->vmid, ghvm->auth, mem_handle,
>> +				0, 0, dtb_offset, ghvm->dtb_config.size);
> 
> Default value of auth is 0 (GH_RM_VM_AUTH_NONE). Is that what you wanted here?
> Perhaps initialize default value of auth to be GH_RM_VM_AUTH_QCOM_PIL_ELF?
> 

Yes, default VM is GH_RM_VM_AUTH_NONE.