From: Tycho Andersen <tycho@kernel.org>
To: Thomas Gleixner <tglx@kernel.org>, Ingo Molnar <mingo@redhat.com>,
Borislav Petkov <bp@alien8.de>,
Dave Hansen <dave.hansen@linux.intel.com>,
x86@kernel.org, "H. Peter Anvin" <hpa@zytor.com>,
Ashish Kalra <ashish.kalra@amd.com>,
Tom Lendacky <thomas.lendacky@amd.com>,
John Allen <john.allen@amd.com>,
Herbert Xu <herbert@gondor.apana.org.au>,
"David S. Miller" <davem@davemloft.net>,
Ard Biesheuvel <ardb@kernel.org>,
Neeraj Upadhyay <Neeraj.Upadhyay@amd.com>,
Kishon Vijay Abraham I <kvijayab@amd.com>,
Alexey Kardashevskiy <aik@amd.com>,
Nikunj A Dadhania <nikunj@amd.com>,
"Peter Zijlstra (Intel)" <peterz@infradead.org>,
Kim Phillips <kim.phillips@amd.com>,
Sean Christopherson <seanjc@google.com>
Cc: linux-kernel@vger.kernel.org, linux-crypto@vger.kernel.org,
"Tycho Andersen (AMD)" <tycho@kernel.org>
Subject: [PATCH v2 2/2] crypto/ccp: Skip SNP_INIT if preparation fails
Date: Tue, 7 Apr 2026 11:47:13 -0600 [thread overview]
Message-ID: <20260407174713.439474-3-tycho@kernel.org> (raw)
In-Reply-To: <20260407174713.439474-1-tycho@kernel.org>
From: "Tycho Andersen (AMD)" <tycho@kernel.org>
During SNP_INIT, the firmware checks to see that the SNP enable bit is set
on all CPUs. If snp_prepare() failed because not all CPUs were online,
SNP_INIT will fail, so skip it.
Signed-off-by: Tycho Andersen (AMD) <tycho@kernel.org>
---
drivers/crypto/ccp/sev-dev.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)
diff --git a/drivers/crypto/ccp/sev-dev.c b/drivers/crypto/ccp/sev-dev.c
index 939fa8aa155c..854263cbb256 100644
--- a/drivers/crypto/ccp/sev-dev.c
+++ b/drivers/crypto/ccp/sev-dev.c
@@ -1374,7 +1374,9 @@ static int __sev_snp_init_locked(int *error, unsigned int max_snp_asid)
return -EOPNOTSUPP;
}
- snp_prepare();
+ rc = snp_prepare();
+ if (rc < 0)
+ return rc;
/*
* Starting in SNP firmware v1.52, the SNP_INIT_EX command takes a list
--
2.53.0
prev parent reply other threads:[~2026-04-07 17:49 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-04-07 17:47 [PATCH v2 0/2] Skip SNP initialization if CPUs are offlined Tycho Andersen
2026-04-07 17:47 ` [PATCH v2 1/2] x86/sev: Do not initialize SNP if missing CPUs Tycho Andersen
2026-04-07 17:47 ` Tycho Andersen [this message]
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