Function svm_init

freebsd/amd64/vmm/amd/svm.c:554–625

* Initialize a virtual machine. */

 * Initialize a virtual machine.
 */
static void *
svm_init(struct vm *vm, pmap_t pmap)
{
	struct svm_softc *svm_sc;
	struct svm_vcpu *vcpu;
	vm_paddr_t msrpm_pa, iopm_pa, pml4_pa;
	int i;
	uint16_t maxcpus;

	svm_sc = malloc(sizeof (*svm_sc), M_SVM, M_WAITOK | M_ZERO);
	if (((uintptr_t)svm_sc & PAGE_MASK) != 0)
		panic("malloc of svm_softc not aligned on page boundary");

	svm_sc->msr_bitmap = contigmalloc(SVM_MSR_BITMAP_SIZE, M_SVM,
	    M_WAITOK, 0, ~(vm_paddr_t)0, PAGE_SIZE, 0);
	if (svm_sc->msr_bitmap == NULL)
		panic("contigmalloc of SVM MSR bitmap failed");
	svm_sc->iopm_bitmap = contigmalloc(SVM_IO_BITMAP_SIZE, M_SVM,
	    M_WAITOK, 0, ~(vm_paddr_t)0, PAGE_SIZE, 0);
	if (svm_sc->iopm_bitmap == NULL)
		panic("contigmalloc of SVM IO bitmap failed");

	svm_sc->vm = vm;
	svm_sc->nptp = (vm_offset_t)vtophys(pmap->pm_pmltop);

	/*
	 * Intercept read and write accesses to all MSRs.
	 */
	memset(svm_sc->msr_bitmap, 0xFF, SVM_MSR_BITMAP_SIZE);

	/*
	 * Access to the following MSRs is redirected to the VMCB when the
	 * guest is executing. Therefore it is safe to allow the guest to
	 * read/write these MSRs directly without hypervisor involvement.
	 */
	svm_msr_rw_ok(svm_sc->msr_bitmap, MSR_GSBASE);
	svm_msr_rw_ok(svm_sc->msr_bitmap, MSR_FSBASE);
	svm_msr_rw_ok(svm_sc->msr_bitmap, MSR_KGSBASE);

	svm_msr_rw_ok(svm_sc->msr_bitmap, MSR_STAR);
	svm_msr_rw_ok(svm_sc->msr_bitmap, MSR_LSTAR);
	svm_msr_rw_ok(svm_sc->msr_bitmap, MSR_CSTAR);
	svm_msr_rw_ok(svm_sc->msr_bitmap, MSR_SF_MASK);
	svm_msr_rw_ok(svm_sc->msr_bitmap, MSR_SYSENTER_CS_MSR);
	svm_msr_rw_ok(svm_sc->msr_bitmap, MSR_SYSENTER_ESP_MSR);
	svm_msr_rw_ok(svm_sc->msr_bitmap, MSR_SYSENTER_EIP_MSR);
	svm_msr_rw_ok(svm_sc->msr_bitmap, MSR_PAT);

	svm_msr_rd_ok(svm_sc->msr_bitmap, MSR_TSC);

	/*
	 * Intercept writes to make sure that the EFER_SVM bit is not cleared.
	 */
	svm_msr_rd_ok(svm_sc->msr_bitmap, MSR_EFER);

	/* Intercept access to all I/O ports. */
	memset(svm_sc->iopm_bitmap, 0xFF, SVM_IO_BITMAP_SIZE);