linux-kernel - Re: [PATCH v9 0/2] Add SEV-SNP CipherTextHiding feature support

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Message-ID: <175824019789.1343495.7167726134042080248.b4-ty@google.com>
Date: Thu, 18 Sep 2025 17:10:48 -0700
From: Sean Christopherson <seanjc@...gle.com>
To: Sean Christopherson <seanjc@...gle.com>, corbet@....net, pbonzini@...hat.com, 
	tglx@...utronix.de, mingo@...hat.com, bp@...en8.de, 
	dave.hansen@...ux.intel.com, x86@...nel.org, hpa@...or.com, 
	thomas.lendacky@....com, herbert@...dor.apana.org, 
	Ashish Kalra <Ashish.Kalra@....com>
Cc: akpm@...ux-foundation.org, rostedt@...dmis.org, paulmck@...nel.org, 
	michael.roth@....com, linux-doc@...r.kernel.org, linux-kernel@...r.kernel.org, 
	kvm@...r.kernel.org
Subject: Re: [PATCH v9 0/2] Add SEV-SNP CipherTextHiding feature support

On Wed, 20 Aug 2025 20:49:45 +0000, Ashish Kalra wrote:
> From: Ashish Kalra <ashish.kalra@....com>
> 
> Ciphertext hiding prevents host accesses from reading the ciphertext
> of SNP guest private memory. Instead of reading ciphertext, the host
> will see constant default values (0xff).
> 
> The SEV ASID space is split into SEV and SEV-ES/SNP ASID ranges.
> Enabling ciphertext hiding further splits the SEV-ES/SEV-SNP ASID space
> into separate ASID ranges for SEV-ES and SEV-SNP guests.
> 
> [...]

Applied to kvm-x86 ciphertext, with doc and comment fixups.  Thanks!

[1/2] KVM: SEV: Introduce new min,max sev_es and sev_snp asid variables
      https://github.com/kvm-x86/linux/commit/d7fc7d9833f6
[2/2] KVM: SEV: Add SEV-SNP CipherTextHiding support
      https://github.com/kvm-x86/linux/commit/6c7c620585c6

--
https://github.com/kvm-x86/linux/tree/next