From: Sean Christopherson <seanjc@google.com>
To: Ashish Kalra <Ashish.Kalra@amd.com>
Cc: corbet@lwn.net, pbonzini@redhat.com, tglx@linutronix.de,
mingo@redhat.com, bp@alien8.de, dave.hansen@linux.intel.com,
x86@kernel.org, hpa@zytor.com, thomas.lendacky@amd.com,
herbert@gondor.apana.org, akpm@linux-foundation.org,
rostedt@goodmis.org, paulmck@kernel.org, michael.roth@amd.com,
linux-doc@vger.kernel.org, kvm@vger.kernel.org
Subject: Re: [PATCH v8 2/2] KVM: SEV: Add SEV-SNP CipherTextHiding support
Date: Wed, 20 Aug 2025 07:58:09 -0700 [thread overview]
Message-ID: <aKXigZHIe91Fficj@google.com> (raw)
In-Reply-To: <bd3268e4c7a300db33a2cce373741f0e875474a6.1755700627.git.ashish.kalra@amd.com>
On Wed, Aug 20, 2025, Ashish Kalra wrote:
> From: Ashish Kalra <ashish.kalra@amd.com>
>
> Ciphertext hiding prevents host accesses from reading the ciphertext of
> SNP guest private memory. Instead of reading ciphertext, the host reads
> will see constant default values (0xff).
>
> The SEV ASID space is split into SEV and SEV-ES/SEV-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.
>
> Add new module parameter to the KVM module to enable ciphertext hiding
> support and a user configurable system-wide maximum SNP ASID value. If
> the module parameter value is '-1' then the complete SEV-ES/SEV-SNP
> ASID space is allocated to SEV-SNP guests.
>
> Suggested-by: Sean Christopherson <seanjc@google.com>
> Signed-off-by: Ashish Kalra <ashish.kalra@amd.com>
> ---
*sigh*
Give people a chance to follow-up to the existing conversation before spamming
a new version. Sending new versions as quickly as possible doesn't help your
code land faster, it just makes people grumpy.
I'm ignoring this and responding to v7.
prev parent reply other threads:[~2025-08-20 14:58 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-08-20 14:50 [PATCH v8 0/2] Add SEV-SNP CipherTextHiding feature support Ashish Kalra
2025-08-20 14:51 ` [PATCH v8 1/2] KVM: SEV: Introduce new min,max sev_es and sev_snp asid variables Ashish Kalra
2025-08-20 14:51 ` [PATCH v8 2/2] KVM: SEV: Add SEV-SNP CipherTextHiding support Ashish Kalra
2025-08-20 14:58 ` Sean Christopherson [this message]
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