linux-kernel - Re: [RFC PATCH V3 06/16] x86/hyperv: decrypt vmbus pages for sev-snp enlightened guest

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Message-ID: <0aea3782-b494-4c1b-1c74-2337bcdae3ef@gmail.com>
Date:   Fri, 3 Feb 2023 12:11:31 +0800
From:   Tianyu Lan <ltykernel@...il.com>
To:     "Michael Kelley (LINUX)" <mikelley@...rosoft.com>,
        "luto@...nel.org" <luto@...nel.org>,
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        "pbonzini@...hat.com" <pbonzini@...hat.com>,
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        Tianyu Lan <Tianyu.Lan@...rosoft.com>,
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Cc:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "kvm@...r.kernel.org" <kvm@...r.kernel.org>,
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Subject: Re: [RFC PATCH V3 06/16] x86/hyperv: decrypt vmbus pages for sev-snp
 enlightened guest

On 2/1/2023 1:58 AM, Michael Kelley (LINUX) wrote:
>> +
>> +			ret = set_memory_decrypted((unsigned long)
>> +				hv_cpu->post_msg_page, 1);
>> +			if (ret)
>> +				goto err_decrypt_msg_page;
>> +
>> +			memset(hv_cpu->synic_message_page, 0, PAGE_SIZE);
>> +			memset(hv_cpu->synic_event_page, 0, PAGE_SIZE);
>> +			memset(hv_cpu->post_msg_page, 0, PAGE_SIZE);
>> +		}
> Having decrypted the pages here in hv_synic_alloc(), shouldn't
> there be corresponding re-encryption in hv_synic_free()?
> 

Yes, I ignore in this version and will fix it.

Thanks.