VMPTRST instruction (VMX)

Forms

Every encoding of VMPTRST that Intel XED knows, one row per XED instruction form (iform). How to read the notation.

Instruction	Encoding	Requires
`VMPTRST m64` VMPTRST_MEMq	`NP 0F C7 /7`	VMX

Operation

What the forms do, in pseudocode that our tests run against results recorded on real processors. How to read.

if not in_vmx:
    fault(UD)
if vmx_nonroot:
    vm_exit(22)                  # the hypervisor emulates it
if CPL > 0:
    fault(GP, 0)
dest.write(current_vmcs)         # NO_VMCS, all ones, for none
vm_succeed()

Run on AMD Zen 5 (EPYC 9645): 2 cases. Its cases ran where CPUID reported no VMX, and every one raised an exception.

Operands

What each form reads and writes, as Intel XED records it: the operands of its syntax, in order, and the implicit ones that the syntax does not name. How to read.

Operand	Kind	Action
`VMPTRST m64`
`m64`	explicit	write
`RFLAGS`	implicit	write

Flags

M modified, 0 cleared; blank: not affected. How to read.

OF	SF	ZF	AF	PF	CF
All forms
0	0	M	0	0	M

Attributes

What else XED records about the forms. How to read.

All forms: privileged: CPL 0 only; may abort a TSX transaction

CPUID and processors

Each form belongs to an XED ISA set. A form can be used when the processor reports every CPUID bit of one of its ISA set's alternatives.

CPUID requirements and processors of the XED ISA sets above. Alternatives are separated by “or”; processors follow XED’s chip model, whose AMD processors end with Zen 2, and the CPU data of this site for Zen 3 to Zen 6.

ISA set	CPUID	Processors
`VTX` VMX	VMX `CPUID.01H:ECX[5]` VMX	Core (Merom, Conroe), Penryn, Nehalem, Westmere, Sandy Bridge, Ivy Bridge, Haswell, Broadwell, Skylake, Comet Lake, Cannon Lake, Ice Lake (client), Tiger Lake, Alder Lake, Arrow Lake, Panther Lake, Nova Lake, Skylake-SP, Cascade Lake, Cooper Lake, Ice Lake (server), Sapphire Rapids, Emerald Rapids, Granite Rapids, Diamond Rapids, Bonnell, Saltwell, Silvermont, Goldmont, Goldmont Plus, Tremont, Snow Ridge, Lakefield, Sierra Forest, Clearwater Forest, Knights Landing, Knights Mill Note: XED's AMD chips, which it derives from its Intel chips, have VMX too; AMD processors implement AMD-V (SVM) instead, so this list leaves them out.

VMPTRST