linux-kernel - Re: [Resend RFC PATCH V4 13/13] x86/HV: Not set memory decrypted/encrypted during kexec alloc/free page in IVM

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Date:   Thu, 8 Jul 2021 21:54:15 +0800
From:   Tianyu Lan <ltykernel@...il.com>
To:     Dave Hansen <dave.hansen@...el.com>, kys@...rosoft.com,
        haiyangz@...rosoft.com, sthemmin@...rosoft.com, wei.liu@...nel.org,
        decui@...rosoft.com, tglx@...utronix.de, mingo@...hat.com,
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        dave.hansen@...ux.intel.com, luto@...nel.org, peterz@...radead.org,
        konrad.wilk@...cle.com, boris.ostrovsky@...cle.com,
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        will@...nel.org, davem@...emloft.net, kuba@...nel.org,
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Cc:     iommu@...ts.linux-foundation.org, linux-arch@...r.kernel.org,
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Subject: Re: [Resend RFC PATCH V4 13/13] x86/HV: Not set memory
 decrypted/encrypted during kexec alloc/free page in IVM

Hi Dave:
      Thanks for your review.

On 7/8/2021 12:14 AM, Dave Hansen wrote:
> On 7/7/21 8:46 AM, Tianyu Lan wrote:
>> @@ -598,7 +599,7 @@ void arch_kexec_unprotect_crashkres(void)
>>    */
>>   int arch_kexec_post_alloc_pages(void *vaddr, unsigned int pages, gfp_t gfp)
>>   {
>> -	if (sev_active())
>> +	if (sev_active() || hv_is_isolation_supported())
>>   		return 0;
>>   
>>   	/*
>> @@ -611,7 +612,7 @@ int arch_kexec_post_alloc_pages(void *vaddr, unsigned int pages, gfp_t gfp)
>>   
>>   void arch_kexec_pre_free_pages(void *vaddr, unsigned int pages)
>>   {
>> -	if (sev_active())
>> +	if (sev_active() || hv_is_isolation_supported())
>>   		return;
> 
> You might want to take a look through the "protected guest" patches.  I
> think this series is touching a few of the same locations that TDX and
> recent SEV work touch.
> 
> https://lore.kernel.org/lkml/20210618225755.662725-5-sathyanarayanan.kuppuswamy@linux.intel.com/

Thanks for reminder. You are right. There will be a generic API to check 
"proteced guest" type.