From: Randy Dunlap <rdunlap@infradead.org>
To: Ashish Kalra <Ashish.Kalra@amd.com>,
corbet@lwn.net, seanjc@google.com, 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
Cc: akpm@linux-foundation.org, rostedt@goodmis.org,
paulmck@kernel.org, michael.roth@amd.com,
linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org,
kvm@vger.kernel.org
Subject: Re: [PATCH v9 2/2] KVM: SEV: Add SEV-SNP CipherTextHiding support
Date: Wed, 20 Aug 2025 15:45:13 -0700 [thread overview]
Message-ID: <5dff05c1-474e-4fff-a19b-7c17b4db6173@infradead.org> (raw)
In-Reply-To: <95abc49edfde36d4fb791570ea2a4be6ad95fd0d.1755721927.git.ashish.kalra@amd.com>
On 8/20/25 1:50 PM, Ashish Kalra wrote:
> @@ -3064,10 +3070,32 @@ void __init sev_hardware_setup(void)
> out:
> if (sev_enabled) {
> init_args.probe = true;
> +
> + if (sev_is_snp_ciphertext_hiding_supported())
> + init_args.max_snp_asid = min(nr_ciphertext_hiding_asids,
> + min_sev_asid - 1);
> +
> if (sev_platform_init(&init_args))
> sev_supported = sev_es_supported = sev_snp_supported = false;
> else if (sev_snp_supported)
> sev_snp_supported = is_sev_snp_initialized();
> +
> + if (sev_snp_supported)
> + nr_ciphertext_hiding_asids = init_args.max_snp_asid;
> +
> + /*
> + * If ciphertext hiding is enabled, the joint SEV-ES/SEV-SNP
> + * ASID range is partitioned into separate SEV-ES and SEV-SNP
> + * ASID ranges, with the SEV-SNP range being [1..max_snp_asid]
> + * and the SEV-ES range being [max_snp_asid..max_sev_es_asid].
[max_snp_asid + 1..max_sev_es_asid]
?
> + * Note, SEV-ES may effectively be disabled if all ASIDs from
> + * the joint range are assigned to SEV-SNP.
> + */
--
~Randy
next prev parent reply other threads:[~2025-08-20 22:45 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-08-20 20:49 [PATCH v9 0/2] Add SEV-SNP CipherTextHiding feature support Ashish Kalra
2025-08-20 20:50 ` [PATCH v9 1/2] KVM: SEV: Introduce new min,max sev_es and sev_snp asid variables Ashish Kalra
2025-08-20 20:50 ` [PATCH v9 2/2] KVM: SEV: Add SEV-SNP CipherTextHiding support Ashish Kalra
2025-08-20 22:45 ` Randy Dunlap [this message]
2025-08-20 23:23 ` Kalra, Ashish
2025-08-21 10:30 ` Kim Phillips
2025-08-21 10:58 ` Kalra, Ashish
2025-08-21 11:06 ` Kim Phillips
2025-08-21 14:16 ` Sean Christopherson
2025-08-21 15:21 ` Kalra, Ashish
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=5dff05c1-474e-4fff-a19b-7c17b4db6173@infradead.org \
--to=rdunlap@infradead.org \
--cc=Ashish.Kalra@amd.com \
--cc=akpm@linux-foundation.org \
--cc=bp@alien8.de \
--cc=corbet@lwn.net \
--cc=dave.hansen@linux.intel.com \
--cc=herbert@gondor.apana.org \
--cc=hpa@zytor.com \
--cc=kvm@vger.kernel.org \
--cc=linux-doc@vger.kernel.org \
--cc=linux-kernel@vger.kernel.org \
--cc=michael.roth@amd.com \
--cc=mingo@redhat.com \
--cc=paulmck@kernel.org \
--cc=pbonzini@redhat.com \
--cc=rostedt@goodmis.org \
--cc=seanjc@google.com \
--cc=tglx@linutronix.de \
--cc=thomas.lendacky@amd.com \
--cc=x86@kernel.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).