On Mon, 12 Apr 2021 10:32:14 -0600
Alex Williamson <alex.williamson@xxxxxxxxxx> wrote:
> Running a Windows guest on a i915-GVTg_V4_2 from an HD 5500 IGD on
> v5.12-rc6 results in host logs:
>
> gvt: vgpu 1: lrm access to register (20c0)
> gvt: vgpu 1: MI_LOAD_REGISTER_MEM handler error
> gvt: vgpu 1: cmd parser error
> 0x0
> 0x29
>
> gvt: vgpu 1: scan wa ctx error
> gvt: vgpu 1: failed to submit desc 0
> gvt: vgpu 1: fail submit workload on ring rcs0
> gvt: vgpu 1: fail to emulate MMIO write 00002230 len 4
>
> The guest goes into a boot loop triggering this error before reaching
> the desktop and rebooting. Guest using Intel driver 20.19.15.5171
> dated 11/4/2020 (from driver file 15.40.5171).
>
> This VM works well with the same guest and userspace software stack on
> Fedora's kernel 5.11.11-200.fc33.x86_64. Thanks,
Bisected to:
commit f18d417a57438498e0de481d3a0bc900c2b0e057
Author: Yan Zhao <yan.y.zhao@xxxxxxxxx>
Date: Wed Dec 23 11:45:08 2020 +0800
drm/i915/gvt: filter cmds "srm" and "lrm" in cmd_handler
do not allow "srm" and "lrm" except for GEN8_L3SQCREG4 and 0x21f0.
Cc: Colin Xu <colin.xu@xxxxxxxxx>
Cc: Kevin Tian <kevin.tian@xxxxxxxxx>
Signed-off-by: Yan Zhao <yan.y.zhao@xxxxxxxxx>
Signed-off-by: Zhenyu Wang <zhenyuw@xxxxxxxxxxxxxxx>
Link: http://patchwork.freedesktop.org/patch/msgid/20201223034508.17031-1-yan.y.zhao@xxxxxxxxx
Reviewed-by: Zhenyu Wang <zhenyuw@xxxxxxxxxxxxxxx>
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