[PATCH] iommu/amd: Clear amd_iommu_snp_en if snp_rmptable_init() fails

[Dheeraj Kumar Srivastava]

iommu_snp_enable() checks that the IOMMU can support SNP and sets
amd_iommu_snp_en, then calls snp_rmptable_init() to map the RMP table.
If that call fails, CC_ATTR_HOST_SEV_SNP is cleared but amd_iommu_snp_en
is left set. Later IOMMU initialization uses amd_iommu_snp_en to
configure the IOMMU for SNP, on the assumption that RMP setup succeeded.

Clear amd_iommu_snp_en along with CC_ATTR_HOST_SEV_SNP.

Fixes: 409f45387c93 ("x86/sev: Fix broken SNP support with KVM module built-in")
Signed-off-by: Dheeraj Kumar Srivastava <dheerajkumar.srivastava@xxxxxxx>
---
 drivers/iommu/amd/init.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/iommu/amd/init.c b/drivers/iommu/amd/init.c
index 8a410d4aa370..d413b1240294 100644
--- a/drivers/iommu/amd/init.c
+++ b/drivers/iommu/amd/init.c
@@ -3445,6 +3445,7 @@ static __init void iommu_snp_enable(void)
 	return;
 
 disable_snp:
+	amd_iommu_snp_en = false;
 	cc_platform_clear(CC_ATTR_HOST_SEV_SNP);
 #endif
 }
-- 
2.25.1