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dm: fixed an issue that VM can't communicate with peer after rebooting/shutdown 

Due to there is no inter-vm communication shared memory management
module, so each acrn-dm will call shm_unlink when VM rebooting/shutdown.
It causes one issue that if one of the two VMs is rebooting/shutdown,
the VM can't communicate with the peer again.

Currently, we don't release the shared memory to fix this issue.

Tracked-On: #4853
Signed-off-by: Yuan Liu <yuan1.liu@intel.com>
Acked-by: Wang, Yu1 <yu1.wang@intel.com>
This commit is contained in:
Yuan Liu 2020-06-16 15:48:05 +08:00 committed by wenlingz
parent 2a4c59db74
commit c8891cb670
1 changed files with 7 additions and 3 deletions
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10
devicemodel/hw/pci/ivshmem.c
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@ -294,11 +294,15 @@ pci_ivshmem_deinit(struct vmctx *ctx, struct pci_vdev *dev, char *opts)
close(vdev->fd);
if (vdev->name) {
/*
* unlink will only remove the shared memory file object,
* shm_unlink will only remove the shared memory file object,
* the shared memory will be released until all processes
* which opened the shared memory file close the file.
* which opened the shared memory close the file.
*
* Don't invoke shm_unlink(vdev->name) to remove file object now,
* so that the acrn-dm can communicate with the peer again after
* rebooting/shutdown, the side effect is that the shared memory
* will not be released even if all peers exit.
*/
shm_unlink(vdev->name);
free(vdev->name);
}
free(vdev);