x86: vmware: look for DMI string in the product serial key

Impact: Should permit VMware detection on older platforms where the
vendor is changed.  Could theoretically cause a regression if some
weird serial number scheme contains the string "VMware" by pure
chance.  Seems unlikely, especially with the mixed case.

In some user configured cases, VMware may choose not to put a VMware specific
DMI string, but the product serial key is always there and is VMware specific.
Add a interface to check the serial key, when checking for VMware in the DMI
information.

Signed-off-by: Alok N Kataria <akataria@vmware.com>
Signed-off-by: H. Peter Anvin <hpa@zytor.com>

1 files changed, 6 insertions, 1 deletions

diff --git a/arch/x86/kernel/cpu/vmware.c b/arch/x86/kernel/cpu/vmware.c
index a0905ecfe7d2..c034bda842d9 100644
--- a/arch/x86/kernel/cpu/vmware.c
+++ b/arch/x86/kernel/cpu/vmware.c
@@ -61,6 +61,11 @@ static unsigned long __vmware_get_tsc_khz(void)
         return tsc_hz;
 }
 
+/*
+ * While checking the dmi string infomation, just checking the product
+ * serial key should be enough, as this will always have a VMware
+ * specific string when running under VMware hypervisor.
+ */
 int vmware_platform(void)
 {
         if (cpu_has_hypervisor) {
@@ -74,7 +79,7 @@ int vmware_platform(void)
                 hyper_vendor_id[12] = '\0';
                 if (!strcmp(hyper_vendor_id, "VMwareVMware"))
                         return 1;
-        } else if (dmi_available && dmi_name_in_vendors("VMware") &&
+        } else if (dmi_available && dmi_name_in_serial("VMware") &&
                    __vmware_platform())
                 return 1;