PsWriteMsr

Writes the specified value to a model-specific register.

Syntax

PULSE_STATUS PsWriteMsr(
[in] PPS_ENGINE pEngine,
[in] uint32_t MsrNumber,
[in] uint64_t MsrValue
);

PPS_ENGINE pEngine

An opaque handle to an engine created by the EngCreateEngine function.

uint32_t MsrNumber

The number of the model-specific register. Refer to the Intel Software Developers Manual for MSR numbers available on your platform.

uint64_t MsrValue

The 64-bit value to be written to the model-specific register.

If the function succeeds, the return value is PULSE_STATUS_SUCCESS.

If it fails, it returns one of the PULSE_STATUS values. Possible return codes include, but are not limited to, the following:

PULSE_STATUS_INSUFFICIENT_RESOURCES 0xC0000002	One of the memory allocations failed during initialization.
PULSE_STATUS_READ_FAILED 0xC0000003	Transport communication failed during a read operation.
PULSE_STATUS_WRITE_FAILED 0xC0000004	Transport communication failed during a write operation.
PULSE_STATUS_TIMEOUT 0xC0000007	Might happen if Transport I/O timed out. No response was received from the debuggee within the request timeout period.
PULSE_STATUS_INVALID_PARAMETER 0xC0000010	The pEngine parameter is NULL.
PULSE_STATUS_INVALID_PACKET 0xC0000031	An invalid or unexpected packet was received in response.
PULSE_STATUS_DEVICE_CONNECTION_LOST 0xC0000308	The connection to the transport was lost. Try restarting the engine or the transport.
PULSE_STATUS_EXCEPTION_GENERAL_PROTECTION 0xC001000D	Writing the MSR with the WRMSR instruction caused a #GP exception. This may occur if an invalid MSR number is specified.

Even though the WRMSR instruction is executed in VMX-root mode, the result is applied to the guest debuggee for the following MSRs: