C++ (Cpp) mmap_anon_or_hugetlbfsの例

コード例 #1

ファイル: kvm.c プロジェクト: bsingharora/kvmtool

void kvm__arch_init(struct kvm *kvm, const char *hugetlbfs_path, u64 ram_size)
{
	/*
	 * Allocate guest memory. We must align our buffer to 64K to
	 * correlate with the maximum guest page size for virtio-mmio.
	 * If using THP, then our minimal alignment becomes 2M.
	 * 2M trumps 64K, so let's go with that.
	 */
	kvm->ram_size = min(ram_size, (u64)ARM_MAX_MEMORY(kvm));
	kvm->arch.ram_alloc_size = kvm->ram_size + SZ_2M;
	kvm->arch.ram_alloc_start = mmap_anon_or_hugetlbfs(kvm, hugetlbfs_path,
						kvm->arch.ram_alloc_size);

	if (kvm->arch.ram_alloc_start == MAP_FAILED)
		die("Failed to map %lld bytes for guest memory (%d)",
		    kvm->arch.ram_alloc_size, errno);

	kvm->ram_start = (void *)ALIGN((unsigned long)kvm->arch.ram_alloc_start,
					SZ_2M);

	madvise(kvm->arch.ram_alloc_start, kvm->arch.ram_alloc_size,
		MADV_MERGEABLE);

	madvise(kvm->arch.ram_alloc_start, kvm->arch.ram_alloc_size,
		MADV_HUGEPAGE);

	/* Create the virtual GIC. */
	if (gic__create(kvm, kvm->cfg.arch.irqchip))
		die("Failed to create virtual GIC");
}

コード例 #2

ファイル: kvm.c プロジェクト: rminnich/vmtool

void kvm__arch_init(struct kvm *kvm, const char *hugetlbfs_path, u64 ram_size)
{
	/*
	 * Allocate guest memory. We must align out buffer to 64K to
	 * correlate with the maximum guest page size for virtio-mmio.
	 */
	kvm->ram_size = min(ram_size, (u64)ARM_MAX_MEMORY(kvm));
	kvm->arch.ram_alloc_size = kvm->ram_size + SZ_64K;
	kvm->arch.ram_alloc_start = mmap_anon_or_hugetlbfs(kvm, hugetlbfs_path,
						kvm->arch.ram_alloc_size);

	if (kvm->arch.ram_alloc_start == MAP_FAILED)
		die("Failed to map %lld bytes for guest memory (%d)",
		    kvm->arch.ram_alloc_size, errno);

	kvm->ram_start = (void *)ALIGN((unsigned long)kvm->arch.ram_alloc_start,
					SZ_64K);

	madvise(kvm->arch.ram_alloc_start, kvm->arch.ram_alloc_size,
		MADV_MERGEABLE);

	/* Initialise the virtual GIC. */
	if (gic__init_irqchip(kvm))
		die("Failed to initialise virtual GIC");
}

コード例 #3

ファイル: kvm.c プロジェクト: carriercomm/lkvm

/* Architecture-specific KVM init */
void kvm__arch_init(struct kvm *kvm, const char *hugetlbfs_path, u64 ram_size)
{
	int ret;

	kvm->ram_start = mmap_anon_or_hugetlbfs(kvm, hugetlbfs_path, ram_size);
	kvm->ram_size = ram_size;

	if (kvm->ram_start == MAP_FAILED)
		die("out of memory");

	madvise(kvm->ram_start, kvm->ram_size, MADV_MERGEABLE);

	ret = ioctl(kvm->vm_fd, KVM_CREATE_IRQCHIP);
	if (ret < 0)
		die_perror("KVM_CREATE_IRQCHIP ioctl");
}