KVM: SVM: Add sev module_param

Web:        https://git.kernel.org/torvalds/c/e9df09428996fcdc43e2b0db2a0e8b38198931c4
Commit:     e9df09428996fcdc43e2b0db2a0e8b38198931c4
Parent:     ed3cd233f8074015e164547abfcdd4678fd10bb4
Refname:    refs/heads/master
Author:     Brijesh Singh <[email protected]>
AuthorDate: Mon Dec 4 10:57:33 2017 -0600
Committer:  Brijesh Singh <[email protected]>
CommitDate: Mon Dec 4 10:57:33 2017 -0600

    KVM: SVM: Add sev module_param
    
    The module parameter can be used to control the SEV feature support.
    
    Cc: Thomas Gleixner <[email protected]>
    Cc: Ingo Molnar <[email protected]>
    Cc: "H. Peter Anvin" <[email protected]>
    Cc: Paolo Bonzini <[email protected]>
    Cc: "Radim Krčmář" <[email protected]>
    Cc: Joerg Roedel <[email protected]>
    Cc: Borislav Petkov <[email protected]>
    Cc: Tom Lendacky <[email protected]>
    Cc: [email protected]
    Cc: [email protected]
    Cc: [email protected]
    Signed-off-by: Brijesh Singh <[email protected]>
    Reviewed-by: Borislav Petkov <[email protected]>
---
 arch/x86/kvm/svm.c | 49 +++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 49 insertions(+)

diff --git a/arch/x86/kvm/svm.c b/arch/x86/kvm/svm.c
index bff7ce727a78..ca63642517a7 100644
--- a/arch/x86/kvm/svm.c
+++ b/arch/x86/kvm/svm.c
@@ -37,6 +37,7 @@
 #include <linux/amd-iommu.h>
 #include <linux/hashtable.h>
 #include <linux/frame.h>
+#include <linux/psp-sev.h>
 
 #include <asm/apic.h>
 #include <asm/perf_event.h>
@@ -284,6 +285,10 @@ module_param(vls, int, 0444);
 static int vgif = true;
 module_param(vgif, int, 0444);
 
+/* enable/disable SEV support */
+static int sev = IS_ENABLED(CONFIG_AMD_MEM_ENCRYPT_ACTIVE_BY_DEFAULT);
+module_param(sev, int, 0444);
+
 static void svm_set_cr0(struct kvm_vcpu *vcpu, unsigned long cr0);
 static void svm_flush_tlb(struct kvm_vcpu *vcpu);
 static void svm_complete_interrupts(struct vcpu_svm *svm);
@@ -1049,6 +1054,39 @@ static int avic_ga_log_notifier(u32 ga_tag)
 	return 0;
 }
 
+static __init int 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);
+
+	if (!max_sev_asid)
+		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;
+}
+
 static __init int svm_hardware_setup(void)
 {
 	int cpu;
@@ -1084,6 +1122,17 @@ static __init int svm_hardware_setup(void)
 		kvm_enable_efer_bits(EFER_SVME | EFER_LMSLE);
 	}
 
+	if (sev) {
+		if (boot_cpu_has(X86_FEATURE_SEV) &&
+		    IS_ENABLED(CONFIG_KVM_AMD_SEV)) {
+			r = sev_hardware_setup();
+			if (r)
+				sev = false;
+		} else {
+			sev = false;
+		}
+	}
+
 	for_each_possible_cpu(cpu) {
 		r = svm_cpu_init(cpu);
 		if (r)
--
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