linux-kernel - Re: [PATCH 03/13] x86/HV: Add new hvcall guest address host visibility support

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Message-ID: <YQfepYTC4n6agq9z@8bytes.org>
Date:   Mon, 2 Aug 2021 14:01:41 +0200
From:   Joerg Roedel <joro@...tes.org>
To:     Dave Hansen <dave.hansen@...el.com>
Cc:     Tianyu Lan <ltykernel@...il.com>, kys@...rosoft.com,
        haiyangz@...rosoft.com, sthemmin@...rosoft.com, wei.liu@...nel.org,
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        dave.hansen@...ux.intel.com, luto@...nel.org, peterz@...radead.org,
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Subject: Re: [PATCH 03/13] x86/HV: Add new hvcall guest address host
 visibility support

On Wed, Jul 28, 2021 at 08:29:41AM -0700, Dave Hansen wrote:
> __set_memory_enc_dec() is turning into a real mess.  SEV, TDX and now
> Hyper-V are messing around in here.

I was going to suggest a PV_OPS call where the fitting implementation
for the guest environment can be plugged in at boot. There is TDX and an
SEV(-SNP) case, a Hyper-V case, and likely more coming up from other
cloud/hypervisor vendors. Hiding all these behind feature checks is not
going to make things cleaner.

Regards,

	Joerg