__rmpadjust

Microsoft Specific

Modifies reverse map table (RMP) permissions for a guest page.

Syntax

unsigned int __rmpadjust(
   unsigned __int64 guest_va,
   unsigned __int8 page_size,
   unsigned __int8 target_vmpl,
   unsigned __int8 target_perm_mask,
   unsigned __int8  vmsa
);

Parameters

guest_va
[in] The guest virtual address.

page_size
[in] The page size.

target_vmpl
[in] The target virtual machine privilege level (VMPL).

target_perm_mask
[in] The desired permission mask.

vmsa
[in] Indicates if the page may be used as a VM Save Area page (0=No, 1=Yes). Ignored when the current VMPL != 0

Return value

Returns a status code that indicates the result of the operation.

Value	Description
0	The operation completed successfully.
1	An input parameter is invalid.
2	The current VMPL has insufficient permissions.
6	The guest page and RMP entry page sizes don't match.

Remarks

The __rmpadjust intrinsic corresponds to the AMD RMPADJUST machine instruction. It's available only as an intrinsic and can be used only in kernel mode.

For more information, see AMD64 Architecture Programmer's Manual, Volume 2: System Programming.

Requirements

Available starting with MSVC 19.52.3683

Intrinsic	Architecture	Header
__rmpadjust	AMD x86/x64 with SEV-SNP support	<ammintrin.h>

END Microsoft Specific

See also

Compiler intrinsics
__psmash
__pvalidate
__rmpquery
__rmpread
__rmpupdate