[PATCH v3 5/7] tools: secure guest check for AMD in virt-host-validate

[Paulo de Rezende Pinatti <ppinatti@xxxxxxxxxxxxx>]

From: Boris Fiuczynski <fiuczy@xxxxxxxxxxxxx>

Add checking in virt-host-validate for secure guest support
on x86 for AMD Secure Encrypted Virtualization.

Signed-off-by: Boris Fiuczynski <fiuczy@xxxxxxxxxxxxx>
Reviewed-by: Paulo de Rezende Pinatti <ppinatti@xxxxxxxxxxxxx>
Reviewed-by: Bjoern Walk <bwalk@xxxxxxxxxxxxx>
Reviewed-by: Erik Skultety <eskultet@xxxxxxxxxx>
---
 tools/virt-host-validate-common.c | 30 +++++++++++++++++++++++++++++-
 tools/virt-host-validate-common.h |  1 +
 2 files changed, 30 insertions(+), 1 deletion(-)

diff --git a/tools/virt-host-validate-common.c b/tools/virt-host-validate-common.c
index 6e03235ceb..0e5932c17e 100644
--- a/tools/virt-host-validate-common.c
+++ b/tools/virt-host-validate-common.c
@@ -41,7 +41,8 @@ VIR_ENUM_IMPL(virHostValidateCPUFlag,
               "vmx",
               "svm",
               "sie",
-              "158");
+              "158",
+              "sev");
 
 static bool quiet;
 
@@ -448,14 +449,18 @@ int virHostValidateSecureGuests(const char *hvname,
 {
     virBitmapPtr flags;
     bool hasFac158 = false;
+    bool hasAMDSev = false;
     virArch arch = virArchFromHost();
     g_autofree char *cmdline = NULL;
     static const char *kIBMValues[] = {"y", "Y", "on", "ON", "oN", "On", "1"};
+    g_autofree char *mod_value = NULL;
 
     flags = virHostValidateGetCPUFlags();
 
     if (flags && virBitmapIsBitSet(flags, VIR_HOST_VALIDATE_CPU_FLAG_FACILITY_158))
         hasFac158 = true;
+    else if (flags && virBitmapIsBitSet(flags, VIR_HOST_VALIDATE_CPU_FLAG_SEV))
+        hasAMDSev = true;
 
     virBitmapFree(flags);
 
@@ -487,6 +492,29 @@ int virHostValidateSecureGuests(const char *hvname,
             virHostMsgFail(level, "Hardware or firmware does not provide "
                                   "support for IBM Secure Execution");
         }
+    } else if (hasAMDSev) {
+        if (virFileReadValueString(&mod_value, "/sys/module/kvm_amd/parameters/sev") < 0) {
+            virHostMsgFail(level, "AMD Secure Encrypted Virtualization not "
+                                  "supported by the currently used kernel");
+            return 0;
+        }
+
+        if (mod_value[0] != '1') {
+            virHostMsgFail(level,
+                           "AMD Secure Encrypted Virtualization appears to be "
+                           "disabled in kernel. Add mem_encrypt=on "
+                           "kvm_amd.sev=1 to kernel cmdline arguments");
+            return 0;
+        }
+
+        if (virFileExists("/dev/sev")) {
+            virHostMsgPass();
+            return 1;
+        } else {
+            virHostMsgFail(level,
+                           "AMD Secure Encrypted Virtualization appears to be "
+                           "disabled in firemare.");
+        }
     } else {
         virHostMsgFail(level,
                        "Unknown if this platform has Secure Guest support");
diff --git a/tools/virt-host-validate-common.h b/tools/virt-host-validate-common.h
index 44b5544a12..3df5ea0c7e 100644
--- a/tools/virt-host-validate-common.h
+++ b/tools/virt-host-validate-common.h
@@ -38,6 +38,7 @@ typedef enum {
     VIR_HOST_VALIDATE_CPU_FLAG_SVM,
     VIR_HOST_VALIDATE_CPU_FLAG_SIE,
     VIR_HOST_VALIDATE_CPU_FLAG_FACILITY_158,
+    VIR_HOST_VALIDATE_CPU_FLAG_SEV,
 
     VIR_HOST_VALIDATE_CPU_FLAG_LAST,
 } virHostValidateCPUFlag;
-- 
2.26.2