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/*++
Copyright (c) Alex Ionescu. All rights reserved.
Module Name:
shv.c
Abstract:
This module implements the Driver Entry/Unload for the Simple Hyper Visor.
Author:
Alex Ionescu (@aionescu) 16-Mar-2016 - Initial version
Environment:
Kernel mode only.
--*/
#include "shv.h"
VOID
ShvUnload (
VOID
)
{
//
// Attempt to exit VMX root mode on all logical processors. This will
// broadcast an interrupt which will execute the callback routine in
// parallel on the LPs.
//
// Note that if SHV is not loaded on any of the LPs, this routine will not
// perform any work, but will not fail in any way.
//
ShvOsRunCallbackOnProcessors(ShvVpUnloadCallback, NULL);
//
// Indicate unload
//
ShvOsDebugPrint("The SHV has been uninstalled.\n");
}
INT32
ShvLoad (
VOID
)
{
SHV_CALLBACK_CONTEXT callbackContext;
//
// Attempt to enter VMX root mode on all logical processors. This will
// broadcast a DPC interrupt which will execute the callback routine in
// parallel on the LPs. Send the callback routine the physical address of
// the PML4 of the system process, which is what this driver entrypoint
// should be executing in.
//
callbackContext.Cr3 = __readcr3();
callbackContext.FailureStatus = SHV_STATUS_SUCCESS;
callbackContext.FailedCpu = -1;
callbackContext.InitCount = 0;
ShvOsRunCallbackOnProcessors(ShvVpLoadCallback, &callbackContext);
//
// Check if all LPs are now hypervised. Return the failure code of at least
// one of them.
//
// Note that each VP is responsible for freeing its VP data on failure.
//
if (callbackContext.InitCount != ShvOsGetActiveProcessorCount())
{
ShvOsDebugPrint("The SHV failed to initialize (0x%lX) Failed CPU: %d\n",
callbackContext.FailureStatus, callbackContext.FailedCpu);
return callbackContext.FailureStatus;
}
//
// Indicate success.
//
ShvOsDebugPrint("The SHV has been installed.\n");
return SHV_STATUS_SUCCESS;
}
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