linux-kernel - [PATCH] KVM: SVM: fix compilation with modular PSP and non-modular KVM

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Date:   Mon, 13 Apr 2020 03:50:31 -0400
From:   Paolo Bonzini <pbonzini@...hat.com>
To:     linux-kernel@...r.kernel.org, kvm@...r.kernel.org
Cc:     ubizjak@...il.com
Subject: [PATCH] KVM: SVM: fix compilation with modular PSP and non-modular KVM

Use svm_sev_enabled() in order to cull all calls to PSP code.  Otherwise,
compilation fails with undefined symbols if the PSP device driver is compiled
as a module and KVM is not.

Reported-by: Uros Bizjak <ubizjak@...il.com>
Signed-off-by: Paolo Bonzini <pbonzini@...hat.com>
---
 arch/x86/kvm/svm/sev.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/arch/x86/kvm/svm/sev.c b/arch/x86/kvm/svm/sev.c
index 0e3fc311d7da..364ffe32139c 100644
--- a/arch/x86/kvm/svm/sev.c
+++ b/arch/x86/kvm/svm/sev.c
@@ -1117,7 +1117,7 @@ int __init sev_hardware_setup(void)
 	/* Maximum number of encrypted guests supported simultaneously */
 	max_sev_asid = cpuid_ecx(0x8000001F);
 
-	if (!max_sev_asid)
+        if (!svm_sev_enabled())
 		return 1;
 
 	/* Minimum ASID value that should be used for SEV guest */
@@ -1156,6 +1156,9 @@ int __init sev_hardware_setup(void)
 
 void sev_hardware_teardown(void)
 {
+        if (!svm_sev_enabled())
+                return;
+
 	bitmap_free(sev_asid_bitmap);
 	bitmap_free(sev_reclaim_asid_bitmap);
 
-- 
2.18.2