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authorMichal Wajdeczko <michal.wajdeczko@intel.com>2025-07-02 01:00:52 +0300
committerLucas De Marchi <lucas.demarchi@intel.com>2025-07-08 06:57:07 +0300
commit705a412a367f383430fa34bada387af2e52eb043 (patch)
tree72436b88ccca0545b03b68f653a06f0f5ce45aba
parentd7b8f8e20813f0179d8ef519541a3527e7661d3a (diff)
downloadlinux-705a412a367f383430fa34bada387af2e52eb043.tar.xz
drm/xe/pf: Clear all LMTT pages on alloc
Our LMEM buffer objects are not cleared by default on alloc and during VF provisioning we only setup LMTT PTEs for the actually provisioned LMEM range. But beyond that valid range we might leave some stale data that could either point to some other VFs allocations or even to the PF pages. Explicitly clear all new LMTT page to avoid the risk that a malicious VF would try to exploit that gap. While around add asserts to catch any undesired PTE overwrites and low-level debug traces to track LMTT PT life-cycle. Fixes: b1d204058218 ("drm/xe/pf: Introduce Local Memory Translation Table") Signed-off-by: Michal Wajdeczko <michal.wajdeczko@intel.com> Cc: Michał Winiarski <michal.winiarski@intel.com> Cc: Lukasz Laguna <lukasz.laguna@intel.com> Reviewed-by: Michał Winiarski <michal.winiarski@intel.com> Reviewed-by: Piotr Piórkowski <piotr.piorkowski@intel.com> Link: https://lore.kernel.org/r/20250701220052.1612-1-michal.wajdeczko@intel.com (cherry picked from commit 3fae6918a3e27cce20ded2551f863fb05d4bef8d) Signed-off-by: Lucas De Marchi <lucas.demarchi@intel.com>
-rw-r--r--drivers/gpu/drm/xe/xe_lmtt.c11
1 files changed, 11 insertions, 0 deletions
diff --git a/drivers/gpu/drm/xe/xe_lmtt.c b/drivers/gpu/drm/xe/xe_lmtt.c
index 63db66df064b..023ed6a6b49d 100644
--- a/drivers/gpu/drm/xe/xe_lmtt.c
+++ b/drivers/gpu/drm/xe/xe_lmtt.c
@@ -78,6 +78,9 @@ static struct xe_lmtt_pt *lmtt_pt_alloc(struct xe_lmtt *lmtt, unsigned int level
}
lmtt_assert(lmtt, xe_bo_is_vram(bo));
+ lmtt_debug(lmtt, "level=%u addr=%#llx\n", level, (u64)xe_bo_main_addr(bo, XE_PAGE_SIZE));
+
+ xe_map_memset(lmtt_to_xe(lmtt), &bo->vmap, 0, 0, bo->size);
pt->level = level;
pt->bo = bo;
@@ -91,6 +94,9 @@ out:
static void lmtt_pt_free(struct xe_lmtt_pt *pt)
{
+ lmtt_debug(&pt->bo->tile->sriov.pf.lmtt, "level=%u addr=%llx\n",
+ pt->level, (u64)xe_bo_main_addr(pt->bo, XE_PAGE_SIZE));
+
xe_bo_unpin_map_no_vm(pt->bo);
kfree(pt);
}
@@ -226,9 +232,14 @@ static void lmtt_write_pte(struct xe_lmtt *lmtt, struct xe_lmtt_pt *pt,
switch (lmtt->ops->lmtt_pte_size(level)) {
case sizeof(u32):
+ lmtt_assert(lmtt, !overflows_type(pte, u32));
+ lmtt_assert(lmtt, !pte || !iosys_map_rd(&pt->bo->vmap, idx * sizeof(u32), u32));
+
xe_map_wr(lmtt_to_xe(lmtt), &pt->bo->vmap, idx * sizeof(u32), u32, pte);
break;
case sizeof(u64):
+ lmtt_assert(lmtt, !pte || !iosys_map_rd(&pt->bo->vmap, idx * sizeof(u64), u64));
+
xe_map_wr(lmtt_to_xe(lmtt), &pt->bo->vmap, idx * sizeof(u64), u64, pte);
break;
default: