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X-OriginatorOrg: arm.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 25 Jun 2025 11:16:51.7925 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: cc3f55dd-47cd-4e74-f1a7-08ddb3d9c90d X-MS-Exchange-CrossTenant-Id: f34e5979-57d9-4aaa-ad4d-b122a662184d X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=f34e5979-57d9-4aaa-ad4d-b122a662184d;Ip=[4.158.2.129];Helo=[outbound-uk1.az.dlp.m.darktrace.com] X-MS-Exchange-CrossTenant-AuthSource: AMS0EPF000001A3.eurprd05.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: GV2PR08MB8749 On 25/06/25 4:38 pm, Ryan Roberts wrote: > On 13/06/2025 14:43, Dev Jain wrote: >> Commit fcf8dda8cc48 ("arm64: pageattr: Explicitly bail out when changing >> permissions for vmalloc_huge mappings") disallowed changing permissions >> for vmalloc-huge mappings. The motivation of this was to enforce an API >> requirement and explicitly tell the caller that it is unsafe to change >> permissions for block mappings since splitting may be required, which >> cannot be handled safely on an arm64 system in absence of BBML2. >> >> This patch effectively partially reverts this commit, since patch 1 >> will now enable permission changes on kernel block mappings, thus, >> through change_memory_common(), enable permission changes for vmalloc-huge >> mappings. Any caller "misusing" the API, in the sense, calling it for >> a partial block mapping, will receive an error code of -EINVAL via >> the pagewalk callbacks, thus reverting to the behaviour of the API >> itself returning -EINVAL, through apply_to_page_range returning -EINVAL >> in case of block mappings, the difference now being, the -EINVAL is >> restricted to playing permission games on partial block mappings >> courtesy of patch 1. >> >> Signed-off-by: Dev Jain >> --- >> arch/arm64/mm/pageattr.c | 4 +--- >> 1 file changed, 1 insertion(+), 3 deletions(-) >> >> diff --git a/arch/arm64/mm/pageattr.c b/arch/arm64/mm/pageattr.c >> index cfc5279f27a2..66676f7f432a 100644 >> --- a/arch/arm64/mm/pageattr.c >> +++ b/arch/arm64/mm/pageattr.c >> @@ -195,8 +195,6 @@ static int change_memory_common(unsigned long addr, int numpages, >> * we are operating on does not result in such splitting. >> * >> * Let's restrict ourselves to mappings created by vmalloc (or vmap). >> - * Disallow VM_ALLOW_HUGE_VMAP mappings to guarantee that only page >> - * mappings are updated and splitting is never needed. >> * >> * So check whether the [addr, addr + size) interval is entirely >> * covered by precisely one VM area that has the VM_ALLOC flag set. >> @@ -204,7 +202,7 @@ static int change_memory_common(unsigned long addr, int numpages, >> area = find_vm_area((void *)addr); >> if (!area || >> end > (unsigned long)kasan_reset_tag(area->addr) + area->size || >> - ((area->flags & (VM_ALLOC | VM_ALLOW_HUGE_VMAP)) != VM_ALLOC)) >> + !(area->flags & VM_ALLOC)) >> return -EINVAL; >> >> if (!numpages) > I'd be inclined to leave this restriction in place for now. It is not useful > until we have context of the full vmalloc-huge-by-default series, I don't think? Okay.