Red Hat: CVE-2025-23162: kernel: drm/xe/vf: Don't try to trigger a full GT reset if VF

In the Linux kernel, the following vulnerability has been resolved:

drm/xe/vf: Don't try to trigger a full GT reset if VF

VFs don't have access to the GDRST(0x941c) register that driver
uses to reset a GT. Attempt to trigger a reset using debugfs:

$ cat /sys/kernel/debug/dri/0000:00:02.1/gt0/force_reset

or due to a hang condition detected by the driver leads to:

[ ] xe 0000:00:02.1: [drm] GT0: trying reset from force_reset [xe]
[ ] xe 0000:00:02.1: [drm] GT0: reset queued
[ ] xe 0000:00:02.1: [drm] GT0: reset started
[ ] ------------[ cut here ]------------
[ ] xe 0000:00:02.1: [drm] GT0: VF is trying to write 0x1 to an inaccessible register 0x941c+0x0
[ ] WARNING: CPU: 3 PID: 3069 at drivers/gpu/drm/xe/xe_gt_sriov_vf.c:996 xe_gt_sriov_vf_write32+0xc6/0x580 [xe]
[ ] RIP: 0010:xe_gt_sriov_vf_write32+0xc6/0x580 [xe]
[ ] Call Trace:
[ ] <TASK>
[ ] ? show_regs+0x6c/0x80
[ ] ? __warn+0x93/0x1c0
[ ] ? xe_gt_sriov_vf_write32+0xc6/0x580 [xe]
[ ] ? report_bug+0x182/0x1b0
[ ] ? handle_bug+0x6e/0xb0
[ ] ? exc_invalid_op+0x18/0x80
[ ] ? asm_exc_invalid_op+0x1b/0x20
[ ] ? xe_gt_sriov_vf_write32+0xc6/0x580 [xe]
[ ] ? xe_gt_sriov_vf_write32+0xc6/0x580 [xe]
[ ] ? xe_gt_tlb_invalidation_reset+0xef/0x110 [xe]
[ ] ? __mutex_unlock_slowpath+0x41/0x2e0
[ ] xe_mmio_write32+0x64/0x150 [xe]
[ ] do_gt_reset+0x2f/0xa0 [xe]
[ ] gt_reset_worker+0x14e/0x1e0 [xe]
[ ] process_one_work+0x21c/0x740
[ ] worker_thread+0x1db/0x3c0

Fix that by sending H2G VF_RESET(0x5507) action instead.