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ivshmem: use ram_from_fd()

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Instead of having its own mmap handling code, reuse the code from
exec.c.

Note: memory_region_init_ram_from_fd() adds some restrictions
(check for xen, kvm sync-mmu, etc) and changes (such as size
alignment). This may actually be more correct.

Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Message-Id: <20170602141229.15326-6-marcandre.lureau@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Marc-André Lureau 2017-06-02 18:12:25 +04:00 committed by Paolo Bonzini
parent fea617c58b
commit 8381d89bec
1 changed files with 6 additions and 8 deletions
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14
hw/misc/ivshmem.c
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@ -491,9 +491,9 @@ static void setup_interrupt(IVShmemState *s, int vector, Error **errp)
static void process_msg_shmem(IVShmemState *s, int fd, Error **errp)
{
Error *local_err = NULL;
struct stat buf;
size_t size;
void *ptr;
if (s->ivshmem_bar2) {
error_setg(errp, "server sent unexpected shared memory message");
@ -522,15 +522,13 @@ static void process_msg_shmem(IVShmemState *s, int fd, Error **errp)
}
/* mmap the region and map into the BAR2 */
ptr = mmap(0, size, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0);
if (ptr == MAP_FAILED) {
error_setg_errno(errp, errno, "Failed to mmap shared memory");
close(fd);
memory_region_init_ram_from_fd(&s->server_bar2, OBJECT(s),
"ivshmem.bar2", size, true, fd, &local_err);
if (local_err) {
error_propagate(errp, local_err);
return;
}
memory_region_init_ram_ptr(&s->server_bar2, OBJECT(s),
"ivshmem.bar2", size, ptr);
memory_region_set_fd(&s->server_bar2, fd);
s->ivshmem_bar2 = &s->server_bar2;
}