netdev - 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:   Wed, 7 Jul 2021 09:14:28 -0700
From:   Dave Hansen <dave.hansen@...el.com>
To:     Tianyu Lan <ltykernel@...il.com>, kys@...rosoft.com,
        haiyangz@...rosoft.com, sthemmin@...rosoft.com, wei.liu@...nel.org,
        decui@...rosoft.com, tglx@...utronix.de, mingo@...hat.com,
        bp@...en8.de, x86@...nel.org, hpa@...or.com,
        dave.hansen@...ux.intel.com, luto@...nel.org, peterz@...radead.org,
        konrad.wilk@...cle.com, boris.ostrovsky@...cle.com,
        jgross@...e.com, sstabellini@...nel.org, joro@...tes.org,
        will@...nel.org, davem@...emloft.net, kuba@...nel.org,
        jejb@...ux.ibm.com, martin.petersen@...cle.com, arnd@...db.de,
        hch@....de, m.szyprowski@...sung.com, robin.murphy@....com,
        kirill.shutemov@...ux.intel.com, akpm@...ux-foundation.org,
        rppt@...nel.org, Tianyu.Lan@...rosoft.com, thomas.lendacky@....com,
        ardb@...nel.org, robh@...nel.org, nramas@...ux.microsoft.com,
        pgonda@...gle.com, martin.b.radev@...il.com, david@...hat.com,
        krish.sadhukhan@...cle.com, saravanand@...com,
        xen-devel@...ts.xenproject.org, keescook@...omium.org,
        rientjes@...gle.com, hannes@...xchg.org,
        michael.h.kelley@...rosoft.com
Cc:     iommu@...ts.linux-foundation.org, linux-arch@...r.kernel.org,
        linux-hyperv@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-scsi@...r.kernel.org, netdev@...r.kernel.org,
        vkuznets@...hat.com, brijesh.singh@....com, anparri@...rosoft.com
Subject: Re: [Resend RFC PATCH V4 13/13] x86/HV: Not set memory
 decrypted/encrypted during kexec alloc/free page in IVM

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/