[{"id":3673360,"web_url":"http://patchwork.ozlabs.org/comment/3673360/","msgid":"","date":"2026-04-04T01:01:04","subject":"Re: [PATCH v2 2/2] powerpc/vmx: avoid KASAN instrumentation in\n enter_vmx_ops() for kexec","submitter":{"id":79126,"url":"http://patchwork.ozlabs.org/api/people/79126/","name":"Ritesh Harjani (IBM)","email":"ritesh.list@gmail.com"},"content":"Sourabh Jain writes:\n\n> The kexec sequence invokes enter_vmx_ops() via copy_page() with the MMU\n> disabled. In this context, code must not rely on normal virtual address\n> translations or trigger page faults.\n>\n> With KASAN enabled, functions get instrumented and may access shadow\n> memory using regular address translation. When executed with the MMU\n> off, this can lead to page faults (bad_page_fault) from which the\n> kernel cannot recover in the kexec path, resulting in a hang.\n>\n> The kexec path sets preempt_count to HARDIRQ_OFFSET before entering\n> the MMU-off copy sequence.\n>\n> current_thread_info()->preempt_count = HARDIRQ_OFFSET\n> kexec_sequence(..., copy_with_mmu_off = 1)\n> -> kexec_copy_flush(image)\n> copy_segments()\n> -> copy_page(dest, addr)\n> \t bl enter_vmx_ops()\n> if (in_interrupt())\n> return 0\n> \t beq .Lnonvmx_copy\n>\n> Since kexec sets preempt_count to HARDIRQ_OFFSET, in_interrupt()\n> evaluates to true and enter_vmx_ops() returns early.\n>\n> As in_interrupt() (and preempt_count()) are always inlined, mark\n> enter_vmx_ops() with __no_sanitize_address to avoid KASAN\n> instrumentation and shadow memory access with MMU disabled, helping\n> kexec boot fine with KASAN enabled.\n>\n\nNice! LGTM. Please feel free to add:\nReviewed-by: Ritesh Harjani (IBM) \n\n> Cc: Aditya Gupta \n> Cc: Daniel Axtens \n> Cc: Hari Bathini \n> Cc: Madhavan Srinivasan \n> Cc: Mahesh Salgaonkar \n> Cc: Michael Ellerman \n> Cc: Ritesh Harjani (IBM) \n> Cc: Shivang Upadhyay \n> Cc: Venkat Rao Bagalkote \n> Reported-by: Aboorva Devarajan \n> Signed-off-by: Sourabh Jain \n> ---\n> Changelog:\n>\n> v2:\n> - Remove __no_sanitize_address from exit_vmx_ops\n> - Add a comment explaining that marking only enter_vmx_ops\n> with __no_sanitize_address is sufficient for kexec to\n> function properly with KASAN enabled\n>\n> v1:\n> https://lore.kernel.org/all/20260321053121.614022-1-sourabhjain@linux.ibm.com/\n> ---\n> arch/powerpc/lib/vmx-helper.c | 9 ++++++++-\n> 1 file changed, 8 insertions(+), 1 deletion(-)\n>\n> diff --git a/arch/powerpc/lib/vmx-helper.c b/arch/powerpc/lib/vmx-helper.c\n> index 554b248002b4..57e897b60db8 100644\n> --- a/arch/powerpc/lib/vmx-helper.c\n> +++ b/arch/powerpc/lib/vmx-helper.c\n> @@ -52,7 +52,14 @@ int exit_vmx_usercopy(void)\n> }\n> EXPORT_SYMBOL(exit_vmx_usercopy);\n> \n> -int enter_vmx_ops(void)\n> +/*\n> + * Can be called from kexec copy_page() path with MMU off. The kexec\n> + * code sets preempt_count to HARDIRQ_OFFSET so we return early here.\n> + * Since in_interrupt() is always inline, __no_sanitize_address on this\n> + * function is sufficient to avoid KASAN shadow memory accesses in real\n> + * mode.\n> + */\n> +int __no_sanitize_address enter_vmx_ops(void)\n> {\n> \tif (in_interrupt())\n> \t\treturn 0;\n> -- \n> 2.52.0","headers":{"Return-Path":"\n ","X-Original-To":["incoming@patchwork.ozlabs.org","linuxppc-dev@lists.ozlabs.org"],"Delivered-To":"patchwork-incoming@legolas.ozlabs.org","Authentication-Results":["legolas.ozlabs.org;\n\tdkim=pass (2048-bit key;\n unprotected) header.d=gmail.com header.i=@gmail.com header.a=rsa-sha256\n header.s=20251104 header.b=UJI5fEzF;\n\tdkim-atps=neutral","legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=lists.ozlabs.org\n (client-ip=2404:9400:21b9:f100::1; helo=lists.ozlabs.org;\n envelope-from=linuxppc-dev+bounces-19300-incoming=patchwork.ozlabs.org@lists.ozlabs.org;\n receiver=patchwork.ozlabs.org)","lists.ozlabs.org;\n arc=none smtp.remote-ip=\"2607:f8b0:4864:20::42f\"","lists.ozlabs.org;\n dmarc=pass (p=none dis=none) header.from=gmail.com","lists.ozlabs.org;\n\tdkim=pass (2048-bit key;\n unprotected) header.d=gmail.com header.i=@gmail.com header.a=rsa-sha256\n header.s=20251104 header.b=UJI5fEzF;\n\tdkim-atps=neutral","lists.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=gmail.com\n (client-ip=2607:f8b0:4864:20::42f; 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In this context, code must not rely on normal virtual address\n>> translations or trigger page faults.\n>>\n>> With KASAN enabled, functions get instrumented and may access shadow\n>> memory using regular address translation. When executed with the MMU\n>> off, this can lead to page faults (bad_page_fault) from which the\n>> kernel cannot recover in the kexec path, resulting in a hang.\n>>\n>> The kexec path sets preempt_count to HARDIRQ_OFFSET before entering\n>> the MMU-off copy sequence.\n>>\n>> current_thread_info()->preempt_count = HARDIRQ_OFFSET\n>> kexec_sequence(..., copy_with_mmu_off = 1)\n>> -> kexec_copy_flush(image)\n>> copy_segments()\n>> -> copy_page(dest, addr)\n>> \t bl enter_vmx_ops()\n>> if (in_interrupt())\n>> return 0\n>> \t beq .Lnonvmx_copy\n>>\n>> Since kexec sets preempt_count to HARDIRQ_OFFSET, in_interrupt()\n>> evaluates to true and enter_vmx_ops() returns early.\n>>\n>> As in_interrupt() (and preempt_count()) are always inlined, mark\n>> enter_vmx_ops() with __no_sanitize_address to avoid KASAN\n>> instrumentation and shadow memory access with MMU disabled, helping\n>> kexec boot fine with KASAN enabled.\n>>\n> Nice! LGTM. Please feel free to add:\n> Reviewed-by: Ritesh Harjani (IBM) \n\nThanks, Ritesh!\n\nWill add your Reviewed-by tag in the next version.\n\n- Sourabh Jain","headers":{"Return-Path":"\n ","X-Original-To":["incoming@patchwork.ozlabs.org","linuxppc-dev@lists.ozlabs.org"],"Delivered-To":"patchwork-incoming@legolas.ozlabs.org","Authentication-Results":["legolas.ozlabs.org;\n\tdkim=pass (2048-bit key;\n unprotected) header.d=ibm.com header.i=@ibm.com header.a=rsa-sha256\n header.s=pp1 header.b=TSHOZf84;\n\tdkim-atps=neutral","legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=lists.ozlabs.org\n (client-ip=112.213.38.117; helo=lists.ozlabs.org;\n envelope-from=linuxppc-dev+bounces-19303-incoming=patchwork.ozlabs.org@lists.ozlabs.org;\n receiver=patchwork.ozlabs.org)","lists.ozlabs.org;\n arc=none smtp.remote-ip=148.163.156.1","lists.ozlabs.org;\n dmarc=pass (p=none dis=none) header.from=linux.ibm.com","lists.ozlabs.org;\n\tdkim=pass (2048-bit key;\n unprotected) header.d=ibm.com header.i=@ibm.com header.a=rsa-sha256\n header.s=pp1 header.b=TSHOZf84;\n\tdkim-atps=neutral","lists.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=linux.ibm.com\n (client-ip=148.163.156.1; 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