linux-kernel - Re: [PATCH V3 03/13] x86/HV: Add new hvcall guest address host visibility support

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Date:   Tue, 10 Aug 2021 20:25:20 +0800
From:   Tianyu Lan <ltykernel@...il.com>
To:     Wei Liu <wei.liu@...nel.org>
Cc:     kys@...rosoft.com, haiyangz@...rosoft.com, sthemmin@...rosoft.com,
        decui@...rosoft.com, tglx@...utronix.de, mingo@...hat.com,
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        dave.hansen@...ux.intel.com, luto@...nel.org, peterz@...radead.org,
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Subject: Re: [PATCH V3 03/13] x86/HV: Add new hvcall guest address host
 visibility support

On 8/10/2021 7:03 PM, Wei Liu wrote:
>> diff --git a/arch/x86/hyperv/hv_init.c b/arch/x86/hyperv/hv_init.c
>> index 0bb4d9ca7a55..b3683083208a 100644
>> --- a/arch/x86/hyperv/hv_init.c
>> +++ b/arch/x86/hyperv/hv_init.c
>> @@ -607,6 +607,12 @@ EXPORT_SYMBOL_GPL(hv_get_isolation_type);
>>   
>>   bool hv_is_isolation_supported(void)
>>   {
>> +	if (!cpu_feature_enabled(X86_FEATURE_HYPERVISOR))
>> +		return 0;
> Nit: false instead of 0.
> 

OK. Will fix in the next version.

>> +int hv_mark_gpa_visibility(u16 count, const u64 pfn[],
>> +			   enum hv_mem_host_visibility visibility)
>> +{
>> +	struct hv_gpa_range_for_visibility **input_pcpu, *input;
>> +	u16 pages_processed;
>> +	u64 hv_status;
>> +	unsigned long flags;
>> +
>> +	/* no-op if partition isolation is not enabled */
>> +	if (!hv_is_isolation_supported())
>> +		return 0;
>> +
>> +	if (count > HV_MAX_MODIFY_GPA_REP_COUNT) {
>> +		pr_err("Hyper-V: GPA count:%d exceeds supported:%lu\n", count,
>> +			HV_MAX_MODIFY_GPA_REP_COUNT);
>> +		return -EINVAL;
>> +	}
>> +
>> +	local_irq_save(flags);
>> +	input_pcpu = (struct hv_gpa_range_for_visibility **)
>> +			this_cpu_ptr(hyperv_pcpu_input_arg);
>> +	input = *input_pcpu;
>> +	if (unlikely(!input)) {
>> +		local_irq_restore(flags);
>> +		return -EINVAL;
>> +	}
>> +
>> +	input->partition_id = HV_PARTITION_ID_SELF;
>> +	input->host_visibility = visibility;
>> +	input->reserved0 = 0;
>> +	input->reserved1 = 0;
>> +	memcpy((void *)input->gpa_page_list, pfn, count * sizeof(*pfn));
>> +	hv_status = hv_do_rep_hypercall(
>> +			HVCALL_MODIFY_SPARSE_GPA_PAGE_HOST_VISIBILITY, count,
>> +			0, input, &pages_processed);
>> +	local_irq_restore(flags);
>> +
>> +	if (!(hv_status & HV_HYPERCALL_RESULT_MASK))
>> +		return 0;
>> +
>> +	return hv_status & HV_HYPERCALL_RESULT_MASK;
> Joseph introduced a few helper functions in 753ed9c95c37d. They will
> make the code simpler.

OK. Will update in the next version.

Thanks.