linux-kernel - Re: [RFC PATCH V2 10/18] drivers: hv: Decrypt percpu hvcall input arg page in sev-snp enlightened guest

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Message-ID: <a42f1d1a-3eda-83dc-7806-7ea2c9e7656a@gmail.com>
Date:   Mon, 26 Dec 2022 15:26:30 +0800
From:   Tianyu Lan <ltykernel@...il.com>
To:     "Michael Kelley (LINUX)" <mikelley@...rosoft.com>,
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Subject: Re: [RFC PATCH V2 10/18] drivers: hv: Decrypt percpu hvcall input arg
 page in sev-snp enlightened guest

On 12/15/2022 2:16 AM, Michael Kelley (LINUX) wrote:
>> @@ -134,6 +136,16 @@ int hv_common_cpu_init(unsigned int cpu)
>>   	if (!(*inputarg))
>>   		return -ENOMEM;
>>
>> +	if (hv_isolation_type_en_snp()) {
>> +		ret = set_memory_decrypted((unsigned long)*inputarg, 1);
>> +		if (ret) {
>> +			kfree(*inputarg);
> After the kfree(), set *inputarg back to NULL.  There's other code that
> tests the value of *inputarg to know if the per-CPU hypercall page has
> been successfully allocated.
> 

Good point! Will add in the next version.