Enable virtio-rng, a virtio random number generator.
Guest kernel should be compiled with CONFIG_HW_RANDOM_VIRTIO.
Once enabled, A RNG device will be located at /dev/hwrng.
Signed-off-by: Sasha Levin <levinsasha928@xxxxxxxxx>
---
tools/kvm/Makefile | 1 +
tools/kvm/include/kvm/ioport.h | 2 +
tools/kvm/include/kvm/virtio-rng.h | 8 ++
tools/kvm/virtio-rng.c | 184 ++++++++++++++++++++++++++++++++++++
4 files changed, 195 insertions(+), 0 deletions(-)
create mode 100644 tools/kvm/include/kvm/virtio-rng.h
create mode 100644 tools/kvm/virtio-rng.c
diff --git a/tools/kvm/Makefile b/tools/kvm/Makefile
index 659bc35..19e7b9e 100644
--- a/tools/kvm/Makefile
+++ b/tools/kvm/Makefile
@@ -38,6 +38,7 @@ OBJS += kvm-run.o
OBJS += qcow.o
OBJS += mptable.o
OBJS += threadpool.o
+OBJS += virtio-rng.o
DEPS := $(patsubst %.o,%.d,$(OBJS))
diff --git a/tools/kvm/include/kvm/ioport.h b/tools/kvm/include/kvm/ioport.h
index 2fdcca4..6020124 100644
--- a/tools/kvm/include/kvm/ioport.h
+++ b/tools/kvm/include/kvm/ioport.h
@@ -12,6 +12,8 @@
#define IOPORT_VIRTIO_CONSOLE_SIZE 256
#define IOPORT_VIRTIO_NET 0xe200 /* Virtio network device */
#define IOPORT_VIRTIO_NET_SIZE 256
+#define IOPORT_VIRTIO_RNG 0xf200 /* Virtio network device */
+#define IOPORT_VIRTIO_RNG_SIZE 256
struct kvm;
diff --git a/tools/kvm/include/kvm/virtio-rng.h b/tools/kvm/include/kvm/virtio-rng.h
new file mode 100644
index 0000000..7015c1f
--- /dev/null
+++ b/tools/kvm/include/kvm/virtio-rng.h
@@ -0,0 +1,8 @@
+#ifndef KVM__RNG_VIRTIO_H
+#define KVM__RNG_VIRTIO_H
+
+struct kvm;
+
+void virtio_rng__init(struct kvm *kvm);
+
+#endif /* KVM__RNG_VIRTIO_H */
diff --git a/tools/kvm/virtio-rng.c b/tools/kvm/virtio-rng.c
new file mode 100644
index 0000000..d37fb5e
--- /dev/null
+++ b/tools/kvm/virtio-rng.c
@@ -0,0 +1,184 @@
+#include "kvm/virtio-rng.h"
+
+#include "kvm/virtio-pci.h"
+
+#include "kvm/disk-image.h"
+#include "kvm/virtio.h"
+#include "kvm/ioport.h"
+#include "kvm/mutex.h"
+#include "kvm/util.h"
+#include "kvm/kvm.h"
+#include "kvm/pci.h"
+#include "kvm/threadpool.h"
+
+#include <linux/virtio_ring.h>
+#include <linux/virtio_rng.h>
+
+#include <fcntl.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <inttypes.h>
+#include <pthread.h>
+
+#define PCI_VENDOR_ID_REDHAT_QUMRANET 0x1af4
+#define PCI_DEVICE_ID_VIRTIO_RNG 0x1004
+#define PCI_SUBSYSTEM_VENDOR_ID_REDHAT_QUMRANET 0x1af4
+#define PCI_SUBSYSTEM_ID_VIRTIO_RNG 0x0004
+#define PCI_VIRTIO_RNG_DEVNUM 4
+
+#define VIRTIO_RNG_IRQ 11
+#define VIRTIO_RNG_PIN 1
+
+#define NUM_VIRT_QUEUES 1
+
+#define VIRTIO_RNG_QUEUE_SIZE 128
+
+struct rng_device {
+ uint8_t status;
+ uint16_t config_vector;
+ int fd_rng;
+
+ /* virtio queue */
+ uint16_t queue_selector;
+ struct virt_queue vqs[NUM_VIRT_QUEUES];
+ void *jobs[NUM_VIRT_QUEUES];
+};
+
+static struct rng_device rng_device;
+
+static bool virtio_rng_pci_io_in(struct kvm *kvm, uint16_t port, void *data, int size, uint32_t count)
+{
+ unsigned long offset;
+ bool ret = true;
+
+ offset = port - IOPORT_VIRTIO_RNG;
+
+ switch (offset) {
+ case VIRTIO_PCI_HOST_FEATURES:
+ case VIRTIO_PCI_GUEST_FEATURES:
+ case VIRTIO_PCI_QUEUE_SEL:
+ case VIRTIO_PCI_QUEUE_NOTIFY:
+ ret = false;
+ break;
+ case VIRTIO_PCI_QUEUE_PFN:
+ ioport__write32(data, rng_device.vqs[rng_device.queue_selector].pfn);
+ break;
+ case VIRTIO_PCI_QUEUE_NUM:
+ ioport__write16(data, VIRTIO_RNG_QUEUE_SIZE);
+ break;
+ case VIRTIO_PCI_STATUS:
+ ioport__write8(data, rng_device.status);
+ break;
+ case VIRTIO_PCI_ISR:
+ ioport__write8(data, 0x1);
+ kvm__irq_line(kvm, VIRTIO_RNG_IRQ, 0);
+ break;
+ case VIRTIO_MSI_CONFIG_VECTOR:
+ ioport__write16(data, rng_device.config_vector);
+ break;
+ default:
+ ret = false;
+ };
+
+ return ret;
+}
+
+static bool virtio_rng_do_io_request(struct kvm *self, struct virt_queue *queue)
+{
+ struct iovec iov[VIRTIO_RNG_QUEUE_SIZE];
+ uint16_t out, in, head;
+ unsigned int len = 0;
+
+ head = virt_queue__get_iov(queue, iov, &out, &in, self);
+ len = readv(rng_device.fd_rng, iov, in);
+ virt_queue__set_used_elem(queue, head, len);
+
+ return true;
+}
+
+static void virtio_rng_do_io(struct kvm *kvm, void *param)
+{
+ struct virt_queue *vq = param;
+
+ while (virt_queue__available(vq)) {
+ virtio_rng_do_io_request(kvm, vq);
+ kvm__irq_line(kvm, VIRTIO_RNG_IRQ, 1);
+ }
+}
+
+static bool virtio_rng_pci_io_out(struct kvm *kvm, uint16_t port, void *data, int size, uint32_t count)
+{
+ unsigned long offset;
+ bool ret = true;
+
+ offset = port - IOPORT_VIRTIO_RNG;
+
+ switch (offset) {
+ case VIRTIO_MSI_QUEUE_VECTOR:
+ case VIRTIO_PCI_GUEST_FEATURES:
+ break;
+ case VIRTIO_PCI_QUEUE_PFN: {
+ struct virt_queue *queue;
+ void *p;
+
+ queue = &rng_device.vqs[rng_device.queue_selector];
+ queue->pfn = ioport__read32(data);
+ p = guest_flat_to_host(kvm, queue->pfn << 12);
+
+ vring_init(&queue->vring, VIRTIO_RNG_QUEUE_SIZE, p, 4096);
+
+ rng_device.jobs[rng_device.queue_selector] =
+ thread_pool__add_jobtype(kvm, virtio_rng_do_io, queue);
+
+ break;
+ }
+ case VIRTIO_PCI_QUEUE_SEL:
+ rng_device.queue_selector = ioport__read16(data);
+ break;
+ case VIRTIO_PCI_QUEUE_NOTIFY: {
+ uint16_t queue_index;
+ queue_index = ioport__read16(data);
+ thread_pool__signal_work(rng_device.jobs[queue_index]);
+ break;
+ }
+ case VIRTIO_PCI_STATUS:
+ rng_device.status = ioport__read8(data);
+ break;
+ case VIRTIO_MSI_CONFIG_VECTOR:
+ rng_device.config_vector = VIRTIO_MSI_NO_VECTOR;
+ break;
+ default:
+ ret = false;
+ };
+
+ return ret;
+}
+
+static struct ioport_operations virtio_rng_io_ops = {
+ .io_in = virtio_rng_pci_io_in,
+ .io_out = virtio_rng_pci_io_out,
+};
+
+static struct pci_device_header virtio_rng_pci_device = {
+ .vendor_id = PCI_VENDOR_ID_REDHAT_QUMRANET,
+ .device_id = PCI_DEVICE_ID_VIRTIO_RNG,
+ .header_type = PCI_HEADER_TYPE_NORMAL,
+ .revision_id = 0,
+ .class = 0x010000,
+ .subsys_vendor_id = PCI_SUBSYSTEM_VENDOR_ID_REDHAT_QUMRANET,
+ .subsys_id = PCI_SUBSYSTEM_ID_VIRTIO_RNG,
+ .bar[0] = IOPORT_VIRTIO_RNG | PCI_BASE_ADDRESS_SPACE_IO,
+ .irq_pin = VIRTIO_RNG_PIN,
+ .irq_line = VIRTIO_RNG_IRQ,
+};
+
+void virtio_rng__init(struct kvm *kvm)
+{
+ rng_device.fd_rng = open("/dev/urandom", O_RDONLY);
+ if (rng_device.fd_rng < 0)
+ die("Failed initializing RNG");
+
+ pci__register(&virtio_rng_pci_device, PCI_VIRTIO_RNG_DEVNUM);
+
+ ioport__register(IOPORT_VIRTIO_RNG, &virtio_rng_io_ops, IOPORT_VIRTIO_RNG_SIZE);
+}
--
1.7.5.rc3
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