diff options
Diffstat (limited to 'hw/misc/ivshmem.c')
| -rw-r--r-- | hw/misc/ivshmem.c | 31 |
1 files changed, 29 insertions, 2 deletions
diff --git a/hw/misc/ivshmem.c b/hw/misc/ivshmem.c index 0dd8da197a..cf774ea92e 100644 --- a/hw/misc/ivshmem.c +++ b/hw/misc/ivshmem.c @@ -27,6 +27,8 @@ #include "qemu/fifo8.h" #include "sysemu/char.h" +#include "hw/misc/ivshmem.h" + #include <sys/mman.h> #include <sys/types.h> #include <limits.h> @@ -596,6 +598,31 @@ static void ivshmem_read(void *opaque, const uint8_t *buf, int size) } } +static void ivshmem_check_version(void *opaque, const uint8_t * buf, int size) +{ + IVShmemState *s = opaque; + int tmp; + long version; + + if (!fifo_update_and_get(s, buf, size, + &version, sizeof(version))) { + return; + } + + tmp = qemu_chr_fe_get_msgfd(s->server_chr); + if (tmp != -1 || version != IVSHMEM_PROTOCOL_VERSION) { + fprintf(stderr, "incompatible version, you are connecting to a ivshmem-" + "server using a different protocol please check your setup\n"); + qemu_chr_delete(s->server_chr); + s->server_chr = NULL; + return; + } + + IVSHMEM_DPRINTF("version check ok, switch to real chardev handler\n"); + qemu_chr_add_handlers(s->server_chr, ivshmem_can_receive, ivshmem_read, + ivshmem_event, s); +} + /* Select the MSI-X vectors used by device. * ivshmem maps events to vectors statically, so * we just enable all vectors on init and after reset. */ @@ -769,8 +796,8 @@ static void pci_ivshmem_realize(PCIDevice *dev, Error **errp) s->eventfd_chr = g_malloc0(s->vectors * sizeof(CharDriverState *)); - qemu_chr_add_handlers(s->server_chr, ivshmem_can_receive, ivshmem_read, - ivshmem_event, s); + qemu_chr_add_handlers(s->server_chr, ivshmem_can_receive, + ivshmem_check_version, ivshmem_event, s); } else { /* just map the file immediately, we're not using a server */ int fd; |