linux-kernel - Re: [EXTERNAL] [RFC PATCH V6 13/14] x86/hyperv: Add smp support for sev-snp guest

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Date:   Wed, 17 May 2023 16:19:03 +0800
From:   Tianyu Lan <ltykernel@...il.com>
To:     Saurabh Singh Sengar <ssengar@...rosoft.com>,
        "luto@...nel.org" <luto@...nel.org>,
        "tglx@...utronix.de" <tglx@...utronix.de>,
        "mingo@...hat.com" <mingo@...hat.com>,
        "bp@...en8.de" <bp@...en8.de>,
        "dave.hansen@...ux.intel.com" <dave.hansen@...ux.intel.com>,
        "x86@...nel.org" <x86@...nel.org>, "hpa@...or.com" <hpa@...or.com>,
        "seanjc@...gle.com" <seanjc@...gle.com>,
        "pbonzini@...hat.com" <pbonzini@...hat.com>,
        "jgross@...e.com" <jgross@...e.com>,
        Tianyu Lan <Tianyu.Lan@...rosoft.com>,
        "kirill@...temov.name" <kirill@...temov.name>,
        "jiangshan.ljs@...group.com" <jiangshan.ljs@...group.com>,
        "peterz@...radead.org" <peterz@...radead.org>,
        "ashish.kalra@....com" <ashish.kalra@....com>,
        "srutherford@...gle.com" <srutherford@...gle.com>,
        "akpm@...ux-foundation.org" <akpm@...ux-foundation.org>,
        "anshuman.khandual@....com" <anshuman.khandual@....com>,
        "pawan.kumar.gupta@...ux.intel.com" 
        <pawan.kumar.gupta@...ux.intel.com>,
        "adrian.hunter@...el.com" <adrian.hunter@...el.com>,
        "daniel.sneddon@...ux.intel.com" <daniel.sneddon@...ux.intel.com>,
        "alexander.shishkin@...ux.intel.com" 
        <alexander.shishkin@...ux.intel.com>,
        "sandipan.das@....com" <sandipan.das@....com>,
        "ray.huang@....com" <ray.huang@....com>,
        "brijesh.singh@....com" <brijesh.singh@....com>,
        "michael.roth@....com" <michael.roth@....com>,
        "thomas.lendacky@....com" <thomas.lendacky@....com>,
        "venu.busireddy@...cle.com" <venu.busireddy@...cle.com>,
        "sterritt@...gle.com" <sterritt@...gle.com>,
        "tony.luck@...el.com" <tony.luck@...el.com>,
        "samitolvanen@...gle.com" <samitolvanen@...gle.com>,
        "fenghua.yu@...el.com" <fenghua.yu@...el.com>
Cc:     "pangupta@....com" <pangupta@....com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "kvm@...r.kernel.org" <kvm@...r.kernel.org>,
        "linux-hyperv@...r.kernel.org" <linux-hyperv@...r.kernel.org>,
        "linux-arch@...r.kernel.org" <linux-arch@...r.kernel.org>
Subject: Re: [EXTERNAL] [RFC PATCH V6 13/14] x86/hyperv: Add smp support for
 sev-snp guest

On 5/16/2023 1:16 PM, Saurabh Singh Sengar wrote:
>> +		(struct hv_enable_vp_vtl *)ap_start_input_arg;
>> +	memset(start_vp_input, 0, sizeof(*start_vp_input));
>> +	start_vp_input->partition_id = -1;
>> +	start_vp_input->vp_index = cpu;
>> +	start_vp_input->target_vtl.target_vtl = ms_hyperv.vtl;
>> +	*(u64 *)&start_vp_input->vp_context = __pa(vmsa) | 1;
>> +
>> +	do {
>> +		ret = hv_do_hypercall(HVCALL_START_VP,
>> +				      start_vp_input, NULL);
>> +	} while (hv_result(ret) == HV_STATUS_TIME_OUT && retry--);
> can we restore local_irq here ?
> 
>> +
>> +	if (!hv_result_success(ret)) {
>> +		pr_err("HvCallStartVirtualProcessor failed: %llx\n", ret);
>> +		goto done;
> No need of goto here.
> 

Nice catch. The goto label should be removed here. Will update in the 
next version.