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Name Last Modified Last Commit
i915 2020-01-13 18:49:45 UTC 2020-01-13
drm/i915/gen9: Clear residual context state on context switch

Author: Akeem G Abodunrin
Author Date: 2020-01-06 20:45:48 UTC

drm/i915/gen9: Clear residual context state on context switch

Intel GPU Hardware prior to Gen11 does not clear EU state
during a context switch. This can result in information
leakage between contexts.

For Gen8 and Gen9, hardware provides a mechanism for
fast cleardown of the EU state, by issuing a PIPE_CONTROL
with bit 27 set. We can use this in a context batch buffer
to explicitly cleardown the state on every context switch.

As this workaround is already in place for gen8, we can borrow
the code verbatim for Gen9.

Signed-off-by: Mika Kuoppala <mika.kuoppala@linux.intel.com>
Signed-off-by: Akeem G Abodunrin <akeem.g.abodunrin@intel.com>


(backported from commit bc8a76a152c5f9ef3b48104154a65a68a8b76946)
[tyhicks: Backport to 4.4:
 - Apply patch to i915_bpo driver since it handles gen9 chips
 - Use (i915_scratch_offset(engine->i915) + 2 * CACHELINE_BYTES) in
   place of PIPE_CONTROL_STORE_DATA_INDEX since we're missing commit
   e1237523749e ("drm/i915/execlists: Use per-process HWSP as scratch")
 - Remove unused dev_priv variable
 - Replace the existing WaClearSlmSpaceAtContextSwitch that was being
   used for pre-production Kaby Lake]
Signed-off-by: Tyler Hicks <tyhicks@canonical.com>

cves/CVE-2019-3900 2019-08-05 17:51:27 UTC 2019-08-05
vhost: scsi: add weight support

Author: Jason Wang
Author Date: 2019-05-17 04:29:52 UTC

vhost: scsi: add weight support

This patch will check the weight and exit the loop if we exceeds the
weight. This is useful for preventing scsi kthread from hogging cpu
which is guest triggerable.

This addresses CVE-2019-3900.

Cc: Paolo Bonzini <pbonzini@redhat.com>
Cc: Stefan Hajnoczi <stefanha@redhat.com>
Fixes: 057cbf49a1f0 ("tcm_vhost: Initial merge for vhost level target fabric driver")
Signed-off-by: Jason Wang <jasowang@redhat.com>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>


(backported from commit c1ea02f15ab5efb3e93fc3144d895410bf79fcf2)
[tyhicks: Backport to Xenial:
 - Minor context adjustment in local variables
 - Adjust context around the loop in vhost_scsi_handle_vq()
 - No need to modify vhost_scsi_ctl_handle_vq() since it was added later
   in commit 0d02dbd68c47 ("vhost/scsi: Respond to control queue
Signed-off-by: Tyler Hicks <tyhicks@canonical.com>

spectrersb 2018-08-28 18:17:04 UTC 2018-08-28
Bump version

Author: Tyler Hicks
Author Date: 2018-08-28 18:17:04 UTC

Bump version

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