linux-kernel - [PATCH v2 3/9] crypto: ccp: Reset TMR size at SNP Shutdown

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Message-ID: <3169b517645a1dea2926f71bcd1ad6ad447531af.1734392473.git.ashish.kalra@amd.com>
Date: Mon, 16 Dec 2024 23:58:15 +0000
From: Ashish Kalra <Ashish.Kalra@....com>
To: <seanjc@...gle.com>, <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>,
	<john.allen@....com>, <herbert@...dor.apana.org.au>, <davem@...emloft.net>
CC: <michael.roth@....com>, <dionnaglaze@...gle.com>, <kvm@...r.kernel.org>,
	<linux-kernel@...r.kernel.org>, <linux-crypto@...r.kernel.org>,
	<linux-coco@...ts.linux.dev>
Subject: [PATCH v2 3/9] crypto: ccp: Reset TMR size at SNP Shutdown

From: Ashish Kalra <ashish.kalra@....com>

When SEV-SNP is enabled the TMR needs to be 2MB aligned and 2MB sized,
ensure that TMR size is reset back to default when SNP is shutdown as
SNP initialization and shutdown as part of some SNP ioctls may leave
TMR size modified and cause subsequent SEV only initialization to fail.

Signed-off-by: Ashish Kalra <ashish.kalra@....com>
---
 drivers/crypto/ccp/sev-dev.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/crypto/ccp/sev-dev.c b/drivers/crypto/ccp/sev-dev.c
index 0ec2e8191583..9632a9a5c92e 100644
--- a/drivers/crypto/ccp/sev-dev.c
+++ b/drivers/crypto/ccp/sev-dev.c
@@ -1751,6 +1751,9 @@ static int __sev_snp_shutdown_locked(int *error, bool panic)
 	sev->snp_initialized = false;
 	dev_dbg(sev->dev, "SEV-SNP firmware shutdown\n");
 
+	/* Reset TMR size back to default */
+	sev_es_tmr_size = SEV_TMR_SIZE;
+
 	return ret;
 }
 
-- 
2.34.1