search for: commonhvintf

...not being able to use the features from the common specification. I guess what they'd do is reinvent the RNG as a Viridian extension (if they need it). You can certainly do CPUID(0x4F000000) even if HYPERVISOR=0. What you get back is undefined, but in all likelihood it won't be the "CommonHVIntf" string. Paolo

...features from the common specification. I guess what they'd do is > reinvent the RNG as a Viridian extension (if they need it). > > You can certainly do CPUID(0x4F000000) even if HYPERVISOR=0. What you > get back is undefined, but in all likelihood it won't be the > "CommonHVIntf" string. Microsoft already has a specification to obtain a random number via an ACPI device. The VM Generation ID. http://www.microsoft.com/en-us/download/details.aspx?id=30707 David

...features from the common specification. I guess what they'd do is > reinvent the RNG as a Viridian extension (if they need it). > > You can certainly do CPUID(0x4F000000) even if HYPERVISOR=0. What you > get back is undefined, but in all likelihood it won't be the > "CommonHVIntf" string. Microsoft already has a specification to obtain a random number via an ACPI device. The VM Generation ID. http://www.microsoft.com/en-us/download/details.aspx?id=30707 David

...X) > and provide the CPUID leaf 4F000000H, containing: > > * CPUID.4F000000H.0H.EAX = max_commonhv_leaf > * CPUID.4F000000H.0H.EBX = 0x6D6D6F43 > * CPUID.4F000000H.0H.ECX = 0x56486E6F > * CPUID.4F000000H.0H.EDX = 0x66746e49 > > EBX, ECX, and EDX form the string "CommonHVIntf" in little-endian ASCII. While testing various nested combinations, XenServer has found that modern Windows Server versions must have the hypervisor bit hidden from them for them to be happy running HyperV, despite the fact that they will make use of the Viridian virtual extensions also provi...

...X) > and provide the CPUID leaf 4F000000H, containing: > > * CPUID.4F000000H.0H.EAX = max_commonhv_leaf > * CPUID.4F000000H.0H.EBX = 0x6D6D6F43 > * CPUID.4F000000H.0H.ECX = 0x56486E6F > * CPUID.4F000000H.0H.EDX = 0x66746e49 > > EBX, ECX, and EDX form the string "CommonHVIntf" in little-endian ASCII. While testing various nested combinations, XenServer has found that modern Windows Server versions must have the hypervisor bit hidden from them for them to be happy running HyperV, despite the fact that they will make use of the Viridian virtual extensions also provi...

...pervisor bit (bit 31 in CPUID.1H.0H.ECX) and provide the CPUID leaf 4F000000H, containing: * CPUID.4F000000H.0H.EAX = max_commonhv_leaf * CPUID.4F000000H.0H.EBX = 0x6D6D6F43 * CPUID.4F000000H.0H.ECX = 0x56486E6F * CPUID.4F000000H.0H.EDX = 0x66746e49 EBX, ECX, and EDX form the string "CommonHVIntf" in little-endian ASCII. max_commonhv_leaf MUST be a number between 0x4F000000 and 0x4FFFFFFF. It indicates the largest leaf defined in this specification that is provided. Any leaves described in this specification with EAX values that exceed max_commonhv_leaf MUST be handled by guests as t...

...pervisor bit (bit 31 in CPUID.1H.0H.ECX) and provide the CPUID leaf 4F000000H, containing: * CPUID.4F000000H.0H.EAX = max_commonhv_leaf * CPUID.4F000000H.0H.EBX = 0x6D6D6F43 * CPUID.4F000000H.0H.ECX = 0x56486E6F * CPUID.4F000000H.0H.EDX = 0x66746e49 EBX, ECX, and EDX form the string "CommonHVIntf" in little-endian ASCII. max_commonhv_leaf MUST be a number between 0x4F000000 and 0x4FFFFFFF. It indicates the largest leaf defined in this specification that is provided. Any leaves described in this specification with EAX values that exceed max_commonhv_leaf MUST be handled by guests as t...