On 1/13/21 6:37 PM, Sean Christopherson wrote:
Define sev_enabled and sev_es_enabled as 'false' and explicitly #ifdef
out all of sev_hardware_setup() if CONFIG_KVM_AMD_SEV=n. This kills
three birds at once:
- Makes sev_enabled and sev_es_enabled off by default if
CONFIG_KVM_AMD_SEV=n. Previously, they could be on by default if
CONFIG_AMD_MEM_ENCRYPT_ACTIVE_BY_DEFAULT=y, regardless of KVM SEV
support.
- Hides the sev and sev_es module params when CONFIG_KVM_AMD_SEV=n.
- Resolves a false positive -Wnonnull in __sev_recycle_asids() that is
currently masked by the equivalent IS_ENABLED(CONFIG_KVM_AMD_SEV)
check in svm_sev_enabled(), which will be dropped in a future patch.
Cc: Tom Lendacky <thomas.lendacky@xxxxxxx>
Signed-off-by: Sean Christopherson <seanjc@xxxxxxxxxx>
Reviewed by: Tom Lendacky <thomas.lendacky@xxxxxxx>
---
arch/x86/kvm/svm/sev.c | 9 ++++++++-
1 file changed, 8 insertions(+), 1 deletion(-)
diff --git a/arch/x86/kvm/svm/sev.c b/arch/x86/kvm/svm/sev.c
index a024edabaca5..02a66008e9b9 100644
--- a/arch/x86/kvm/svm/sev.c
+++ b/arch/x86/kvm/svm/sev.c
@@ -28,12 +28,17 @@
#define __ex(x) __kvm_handle_fault_on_reboot(x)
/* enable/disable SEV support */
+#ifdef CONFIG_KVM_AMD_SEV
static bool sev_enabled = IS_ENABLED(CONFIG_AMD_MEM_ENCRYPT_ACTIVE_BY_DEFAULT);
module_param_named(sev, sev_enabled, bool, 0444);
/* enable/disable SEV-ES support */
static bool sev_es_enabled = IS_ENABLED(CONFIG_AMD_MEM_ENCRYPT_ACTIVE_BY_DEFAULT);
module_param_named(sev_es, sev_es_enabled, bool, 0444);
+#else
+#define sev_enabled false
+#define sev_es_enabled false
+#endif /* CONFIG_KVM_AMD_SEV */
static u8 sev_enc_bit;
static int sev_flush_asids(void);
@@ -1253,11 +1258,12 @@ void sev_vm_destroy(struct kvm *kvm)
void __init sev_hardware_setup(void)
{
+#ifdef CONFIG_KVM_AMD_SEV
unsigned int eax, ebx, ecx, edx;
bool sev_es_supported = false;
bool sev_supported = false;
- if (!IS_ENABLED(CONFIG_KVM_AMD_SEV) || !sev_enabled)
+ if (!sev_enabled)
goto out;
/* Does the CPU support SEV? */
@@ -1311,6 +1317,7 @@ void __init sev_hardware_setup(void)
out:
sev_enabled = sev_supported;
sev_es_enabled = sev_es_supported;
+#endif
}
void sev_hardware_teardown(void)
