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

[Tianyu Lan]

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@xxxxxxxxxxxxxxx/

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