While testing in vIOMMU, sometimes Guest will unmap very large memory, which will cause the crash. To fix this, add a new function vhost_vdpa_general_unmap(). This function will only unmap the memory that saved in iotlb.
Call Trace: [ 647.820144] ------------[ cut here ]------------ [ 647.820848] kernel BUG at drivers/iommu/intel/iommu.c:1174! [ 647.821486] invalid opcode: 0000 [#1] PREEMPT SMP PTI [ 647.822082] CPU: 10 PID: 1181 Comm: qemu-system-x86 Not tainted 6.0.0-rc1home_lulu_2452_lulu7_vhost+ #62 [ 647.823139] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS rel-1.15.0-29-g6a62e0cb0dfe-prebuilt.qem4 [ 647.824365] RIP: 0010:domain_unmap+0x48/0x110 [ 647.825424] Code: 48 89 fb 8d 4c f6 1e 39 c1 0f 4f c8 83 e9 0c 83 f9 3f 7f 18 48 89 e8 48 d3 e8 48 85 c0 75 59 [ 647.828064] RSP: 0018:ffffae5340c0bbf0 EFLAGS: 00010202 [ 647.828973] RAX: 0000000000000001 RBX: ffff921793d10540 RCX: 000000000000001b [ 647.830083] RDX: 00000000080000ff RSI: 0000000000000001 RDI: ffff921793d10540 [ 647.831214] RBP: 0000000007fc0100 R08: ffffae5340c0bcd0 R09: 0000000000000003 [ 647.832388] R10: 0000007fc0100000 R11: 0000000000100000 R12: 00000000080000ff [ 647.833668] R13: ffffae5340c0bcd0 R14: ffff921793d10590 R15: 0000008000100000 [ 647.834782] FS: 00007f772ec90640(0000) GS:ffff921ce7a80000(0000) knlGS:0000000000000000 [ 647.836004] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 647.836990] CR2: 00007f02c27a3a20 CR3: 0000000101b0c006 CR4: 0000000000372ee0 [ 647.838107] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 647.839283] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 647.840666] Call Trace: [ 647.841437] <TASK> [ 647.842107] intel_iommu_unmap_pages+0x93/0x140 [ 647.843112] __iommu_unmap+0x91/0x1b0 [ 647.844003] iommu_unmap+0x6a/0x95 [ 647.844885] vhost_vdpa_unmap+0x1de/0x1f0 [vhost_vdpa] [ 647.845985] vhost_vdpa_process_iotlb_msg+0xf0/0x90b [vhost_vdpa] [ 647.847235] ? _raw_spin_unlock+0x15/0x30 [ 647.848181] ? _copy_from_iter+0x8c/0x580 [ 647.849137] vhost_chr_write_iter+0xb3/0x430 [vhost] [ 647.850126] vfs_write+0x1e4/0x3a0 [ 647.850897] ksys_write+0x53/0xd0 [ 647.851688] do_syscall_64+0x3a/0x90 [ 647.852508] entry_SYSCALL_64_after_hwframe+0x63/0xcd [ 647.853457] RIP: 0033:0x7f7734ef9f4f [ 647.854408] Code: 89 54 24 18 48 89 74 24 10 89 7c 24 08 e8 29 76 f8 ff 48 8b 54 24 18 48 8b 74 24 10 41 89 c8 [ 647.857217] RSP: 002b:00007f772ec8f040 EFLAGS: 00000293 ORIG_RAX: 0000000000000001 [ 647.858486] RAX: ffffffffffffffda RBX: 00000000fef00000 RCX: 00007f7734ef9f4f [ 647.859713] RDX: 0000000000000048 RSI: 00007f772ec8f090 RDI: 0000000000000010 [ 647.860942] RBP: 00007f772ec8f1a0 R08: 0000000000000000 R09: 0000000000000000 [ 647.862206] R10: 0000000000000001 R11: 0000000000000293 R12: 0000000000000010 [ 647.863446] R13: 0000000000000002 R14: 0000000000000000 R15: ffffffff01100000 [ 647.864692] </TASK> [ 647.865458] Modules linked in: rpcsec_gss_krb5 auth_rpcgss nfsv4 dns_resolver nfs lockd grace fscache netfs v] [ 647.874688] ---[ end trace 0000000000000000 ]---
Cc: stable@vger.kernel.org Fixes: 4c8cf31885f6 ("vhost: introduce vDPA-based backend") Signed-off-by: Cindy Lu lulu@redhat.com --- drivers/vhost/vdpa.c | 40 +++++++++++++++++++++++----------------- 1 file changed, 23 insertions(+), 17 deletions(-)
diff --git a/drivers/vhost/vdpa.c b/drivers/vhost/vdpa.c index 166044642fd5..f8da6a3f98d2 100644 --- a/drivers/vhost/vdpa.c +++ b/drivers/vhost/vdpa.c @@ -683,10 +683,20 @@ static long vhost_vdpa_unlocked_ioctl(struct file *filep, mutex_unlock(&d->mutex); return r; } +static void vhost_vdpa_general_unmap(struct vhost_vdpa *v, + struct vhost_iotlb_map *map, u32 asid) +{ + struct vdpa_device *vdpa = v->vdpa; + const struct vdpa_config_ops *ops = vdpa->config; + if (ops->dma_map) { + ops->dma_unmap(vdpa, asid, map->start, map->size); + } else if (ops->set_map == NULL) { + iommu_unmap(v->domain, map->start, map->size); + } +}
-static void vhost_vdpa_pa_unmap(struct vhost_vdpa *v, - struct vhost_iotlb *iotlb, - u64 start, u64 last) +static void vhost_vdpa_pa_unmap(struct vhost_vdpa *v, struct vhost_iotlb *iotlb, + u64 start, u64 last, u32 asid) { struct vhost_dev *dev = &v->vdev; struct vhost_iotlb_map *map; @@ -703,13 +713,13 @@ static void vhost_vdpa_pa_unmap(struct vhost_vdpa *v, unpin_user_page(page); } atomic64_sub(PFN_DOWN(map->size), &dev->mm->pinned_vm); + vhost_vdpa_general_unmap(v, map, asid); vhost_iotlb_map_free(iotlb, map); } }
-static void vhost_vdpa_va_unmap(struct vhost_vdpa *v, - struct vhost_iotlb *iotlb, - u64 start, u64 last) +static void vhost_vdpa_va_unmap(struct vhost_vdpa *v, struct vhost_iotlb *iotlb, + u64 start, u64 last, u32 asid) { struct vhost_iotlb_map *map; struct vdpa_map_file *map_file; @@ -718,20 +728,21 @@ static void vhost_vdpa_va_unmap(struct vhost_vdpa *v, map_file = (struct vdpa_map_file *)map->opaque; fput(map_file->file); kfree(map_file); + vhost_vdpa_general_unmap(v, map, asid); vhost_iotlb_map_free(iotlb, map); } }
static void vhost_vdpa_iotlb_unmap(struct vhost_vdpa *v, - struct vhost_iotlb *iotlb, - u64 start, u64 last) + struct vhost_iotlb *iotlb, u64 start, + u64 last, u32 asid) { struct vdpa_device *vdpa = v->vdpa;
if (vdpa->use_va) - return vhost_vdpa_va_unmap(v, iotlb, start, last); + return vhost_vdpa_va_unmap(v, iotlb, start, last, asid);
- return vhost_vdpa_pa_unmap(v, iotlb, start, last); + return vhost_vdpa_pa_unmap(v, iotlb, start, last, asid); }
static int perm_to_iommu_flags(u32 perm) @@ -798,17 +809,12 @@ static void vhost_vdpa_unmap(struct vhost_vdpa *v, const struct vdpa_config_ops *ops = vdpa->config; u32 asid = iotlb_to_asid(iotlb);
- vhost_vdpa_iotlb_unmap(v, iotlb, iova, iova + size - 1); + vhost_vdpa_iotlb_unmap(v, iotlb, iova, iova + size - 1, asid);
- if (ops->dma_map) { - ops->dma_unmap(vdpa, asid, iova, size); - } else if (ops->set_map) { + if (ops->set_map) { if (!v->in_batch) ops->set_map(vdpa, asid, iotlb); - } else { - iommu_unmap(v->domain, iova, size); } - /* If we are in the middle of batch processing, delay the free * of AS until BATCH_END. */