[RFC,01/35] KVM: SVM: Remove the call to sev_platform_status() during setup

Commit Message

Tom Lendacky Sept. 14, 2020, 8:15 p.m. UTC

From: Tom Lendacky <[e-mail]>

When both KVM support and the CCP driver are built into the kernel instead
of as modules, KVM initialization happens before CCP initialization. As a
result, sev_platform_status() will return a failure when it is called from
sev_hardware_setup(), when this isn't really an error condition.

Since sev_platform_status() doesn't need to be called at this time anyway,
remove the invocation from sev_hardware_setup().

Signed-off-by: Tom Lendacky <[e-mail]>
---
 arch/x86/kvm/svm/sev.c | 22 +---------------------
 1 file changed, 1 insertion(+), 21 deletions(-)

Patch

diff --git a/arch/x86/kvm/svm/sev.c b/arch/x86/kvm/svm/sev.c
index 402dc4234e39..fab382e2dad2 100644
--- a/arch/x86/kvm/svm/sev.c
+++ b/arch/x86/kvm/svm/sev.c
@@ -1117,9 +1117,6 @@  void sev_vm_destroy(struct kvm *kvm)
 
 int __init sev_hardware_setup(void)
 {
-	struct sev_user_data_status *status;
-	int rc;
-
 	/* Maximum number of encrypted guests supported simultaneously */
 	max_sev_asid = cpuid_ecx(0x8000001F);
 
@@ -1138,26 +1135,9 @@  int __init sev_hardware_setup(void)
 	if (!sev_reclaim_asid_bitmap)
 		return 1;
 
-	status = kmalloc(sizeof(*status), GFP_KERNEL);
-	if (!status)
-		return 1;
-
-	/*
-	 * Check SEV platform status.
-	 *
-	 * PLATFORM_STATUS can be called in any state, if we failed to query
-	 * the PLATFORM status then either PSP firmware does not support SEV
-	 * feature or SEV firmware is dead.
-	 */
-	rc = sev_platform_status(status, NULL);
-	if (rc)
-		goto err;
-
 	pr_info("SEV supported\n");
 
-err:
-	kfree(status);
-	return rc;
+	return 0;
 }
 
 void sev_hardware_teardown(void)