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[v5,3/7] crypto: ccp: Reset TMR size at SNP Shutdown

Message ID ae532a946106e2ddbc031c0d48ebf2e41c56b550.1740512583.git.ashish.kalra@amd.com
State New
Headers show
Series Move initializing SEV/SNP functionality to KVM | expand

Commit Message

Ashish Kalra Feb. 25, 2025, 9 p.m. UTC 
From: Ashish Kalra <ashish.kalra@amd.com>

Implicit SNP initialization as part of some SNP ioctls modify TMR size
to be SNP compliant which followed by SNP shutdown will leave the
TMR size modified and then subsequently cause SEV only initialization
to fail, hence, reset TMR size to default at SNP Shutdown.

Acked-by: Dionna Glaze <dionnaglaze@google.com>
Reviewed-by: Tom Lendacky <thomas.lendacky@amd.com>
Signed-off-by: Ashish Kalra <ashish.kalra@amd.com>
---
 drivers/crypto/ccp/sev-dev.c | 3 +++
 1 file changed, 3 insertions(+)
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Patch

diff --git a/drivers/crypto/ccp/sev-dev.c b/drivers/crypto/ccp/sev-dev.c
index 14847f1c05fc..c784de6c77c3 100644
--- a/drivers/crypto/ccp/sev-dev.c
+++ b/drivers/crypto/ccp/sev-dev.c
@@ -1754,6 +1754,9 @@  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;
 }