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X-CSE-ConnectionGUID: BhXLOiRfShi+2NAFfSnQQw== X-CSE-MsgGUID: pvGzj5BiTs2L5rtCqLvqNw== X-IronPort-AV: E=McAfee;i="6700,10204,11315"; a="47874053" X-IronPort-AV: E=Sophos;i="6.12,315,1728975600"; d="scan'208";a="47874053" Received: from orviesa007.jf.intel.com ([10.64.159.147]) by fmvoesa103.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 14 Jan 2025 13:45:47 -0800 X-CSE-ConnectionGUID: wClD8OzMQai+UBG5Nw361Q== X-CSE-MsgGUID: vzPbyt3kQ96Xavq3f7i4kA== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="6.12,224,1728975600"; d="scan'208";a="105422933" Received: from ssimmeri-mobl2.amr.corp.intel.com (HELO [10.124.223.199]) ([10.124.223.199]) by orviesa007-auth.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 14 Jan 2025 13:45:42 -0800 Content-Type: multipart/mixed; boundary="------------n0n6ZXEhGiQA3ZVqsLB2u14D" Message-ID: <52311c3d-83cf-4dc4-bbcb-5fbca8eb249c@intel.com> Date: Tue, 14 Jan 2025 13:45:39 -0800 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v4 26/30] x86,tlb: Make __flush_tlb_global() noinstr-compliant To: Valentin Schneider , linux-kernel@vger.kernel.org, x86@kernel.org, virtualization@lists.linux.dev, linux-arm-kernel@lists.infradead.org, loongarch@lists.linux.dev, linux-riscv@lists.infradead.org, linux-perf-users@vger.kernel.org, xen-devel@lists.xenproject.org, kvm@vger.kernel.org, linux-arch@vger.kernel.org, rcu@vger.kernel.org, linux-hardening@vger.kernel.org, linux-mm@kvack.org, linux-kselftest@vger.kernel.org, bpf@vger.kernel.org, bcm-kernel-feedback-list@broadcom.com Cc: Peter Zijlstra , Juergen Gross , Ajay Kaher , Alexey Makhalov , Russell King , Catalin Marinas , Will Deacon , Huacai Chen , WANG Xuerui , Paul Walmsley , Palmer Dabbelt , Albert Ou , Thomas Gleixner , Ingo Molnar , Borislav Petkov , Dave Hansen , "H. Peter Anvin" , Arnaldo Carvalho de Melo , Namhyung Kim , Mark Rutland , Alexander Shishkin , Jiri Olsa , Ian Rogers , Adrian Hunter , "Liang, Kan" , Boris Ostrovsky , Josh Poimboeuf , Pawan Gupta , Sean Christopherson , Paolo Bonzini , Andy Lutomirski , Arnd Bergmann , Frederic Weisbecker , "Paul E. McKenney" , Jason Baron , Steven Rostedt , Ard Biesheuvel , Neeraj Upadhyay , Joel Fernandes , Josh Triplett , Boqun Feng , Uladzislau Rezki , Mathieu Desnoyers , Lai Jiangshan , Zqiang , Juri Lelli , Clark Williams , Yair Podemsky , Tomas Glozar , Vincent Guittot , Dietmar Eggemann , Ben Segall , Mel Gorman , Kees Cook , Andrew Morton , Christoph Hellwig , Shuah Khan , Sami Tolvanen , Miguel Ojeda , Alice Ryhl , "Mike Rapoport (Microsoft)" , Samuel Holland , Rong Xu , Nicolas Saenz Julienne , Geert Uytterhoeven , Yosry Ahmed , "Kirill A. Shutemov" , "Masami Hiramatsu (Google)" , Jinghao Jia , Luis Chamberlain , Randy Dunlap , Tiezhu Yang References: <20250114175143.81438-1-vschneid@redhat.com> <20250114175143.81438-27-vschneid@redhat.com> From: Dave Hansen Content-Language: en-US Autocrypt: addr=dave.hansen@intel.com; keydata= xsFNBE6HMP0BEADIMA3XYkQfF3dwHlj58Yjsc4E5y5G67cfbt8dvaUq2fx1lR0K9h1bOI6fC oAiUXvGAOxPDsB/P6UEOISPpLl5IuYsSwAeZGkdQ5g6m1xq7AlDJQZddhr/1DC/nMVa/2BoY 2UnKuZuSBu7lgOE193+7Uks3416N2hTkyKUSNkduyoZ9F5twiBhxPJwPtn/wnch6n5RsoXsb ygOEDxLEsSk/7eyFycjE+btUtAWZtx+HseyaGfqkZK0Z9bT1lsaHecmB203xShwCPT49Blxz VOab8668QpaEOdLGhtvrVYVK7x4skyT3nGWcgDCl5/Vp3TWA4K+IofwvXzX2ON/Mj7aQwf5W iC+3nWC7q0uxKwwsddJ0Nu+dpA/UORQWa1NiAftEoSpk5+nUUi0WE+5DRm0H+TXKBWMGNCFn c6+EKg5zQaa8KqymHcOrSXNPmzJuXvDQ8uj2J8XuzCZfK4uy1+YdIr0yyEMI7mdh4KX50LO1 pmowEqDh7dLShTOif/7UtQYrzYq9cPnjU2ZW4qd5Qz2joSGTG9eCXLz5PRe5SqHxv6ljk8mb ApNuY7bOXO/A7T2j5RwXIlcmssqIjBcxsRRoIbpCwWWGjkYjzYCjgsNFL6rt4OL11OUF37wL 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this_cpu_read(cpu_tlbstate.cr4); > + asm volatile("mov %0,%%cr4": : "r" (cr4 ^ X86_CR4_PGE) : "memory"); > + asm volatile("mov %0,%%cr4": : "r" (cr4) : "memory"); > + /* > + * In lieu of not having the pinning crap, hard fail if CR4 doesn't > + * match the expected value. This ensures that anybody doing dodgy gets > + * the fallthrough check. > + */ > + BUG_ON(cr4 != this_cpu_read(cpu_tlbstate.cr4)); Let's say someone managed to write to cpu_tlbstate.cr4 where they cleared one of the pinned bits. Before this patch, CR4 pinning would WARN_ONCE() about it pretty quickly and also reset the cleared bits. After this patch, the first native_flush_tlb_global() can clear pinned bits, at least until native_write_cr4() gets called the next time. That seems like it'll undermine CR4 pinning at least somewhat. What keeps native_write_cr4() from being noinstr-compliant now? Is it just the WARN_ONCE()? If so, I'd kinda rather have a native_write_cr4_nowarn() that's noinstr-compliant but retains all the other CR4 pinning behavior. Would something like the attached patch be _worse_? --------------n0n6ZXEhGiQA3ZVqsLB2u14D Content-Type: text/x-patch; charset=UTF-8; name="cr4.patch" Content-Disposition: attachment; filename="cr4.patch" Content-Transfer-Encoding: base64 ZGlmZiAtLWdpdCBhL2FyY2gveDg2L2tlcm5lbC9jcHUvY29tbW9uLmMgYi9hcmNoL3g4Ni9r ZXJuZWwvY3B1L2NvbW1vbi5jCmluZGV4IDNlOTAzNzY5MDgxNC4uMjA0NGQ1MTZmMDZmIDEw MDY0NAotLS0gYS9hcmNoL3g4Ni9rZXJuZWwvY3B1L2NvbW1vbi5jCisrKyBiL2FyY2gveDg2 L2tlcm5lbC9jcHUvY29tbW9uLmMKQEAgLTQyMywyNCArNDIzLDQwIEBAIHZvaWQgbmF0aXZl X3dyaXRlX2NyMCh1bnNpZ25lZCBsb25nIHZhbCkKIH0KIEVYUE9SVF9TWU1CT0wobmF0aXZl X3dyaXRlX2NyMCk7CiAKLXZvaWQgX19ub19wcm9maWxlIG5hdGl2ZV93cml0ZV9jcjQodW5z aWduZWQgbG9uZyB2YWwpCit2b2lkIF9fbm9fcHJvZmlsZSBfX25hdGl2ZV93cml0ZV9jcjQo dW5zaWduZWQgbG9uZyB2YWwsIHVuc2lnbmVkIGxvbmcgKmJpdHNfY2hhbmdlZCkKIHsKLQl1 bnNpZ25lZCBsb25nIGJpdHNfY2hhbmdlZCA9IDA7Ci0KIHNldF9yZWdpc3RlcjoKIAlhc20g dm9sYXRpbGUoIm1vdiAlMCwlJWNyNCI6ICIrciIgKHZhbCkgOiA6ICJtZW1vcnkiKTsKIAog CWlmIChzdGF0aWNfYnJhbmNoX2xpa2VseSgmY3JfcGlubmluZykpIHsKIAkJaWYgKHVubGlr ZWx5KCh2YWwgJiBjcjRfcGlubmVkX21hc2spICE9IGNyNF9waW5uZWRfYml0cykpIHsKLQkJ CWJpdHNfY2hhbmdlZCA9ICh2YWwgJiBjcjRfcGlubmVkX21hc2spIF4gY3I0X3Bpbm5lZF9i aXRzOworCQkJKmJpdHNfY2hhbmdlZCA9ICh2YWwgJiBjcjRfcGlubmVkX21hc2spIF4gY3I0 X3Bpbm5lZF9iaXRzOwogCQkJdmFsID0gKHZhbCAmIH5jcjRfcGlubmVkX21hc2spIHwgY3I0 X3Bpbm5lZF9iaXRzOwogCQkJZ290byBzZXRfcmVnaXN0ZXI7CiAJCX0KLQkJLyogV2FybiBh ZnRlciB3ZSd2ZSBjb3JyZWN0ZWQgdGhlIGNoYW5nZWQgYml0cy4gKi8KLQkJV0FSTl9PTkNF KGJpdHNfY2hhbmdlZCwgInBpbm5lZCBDUjQgYml0cyBjaGFuZ2VkOiAweCVseCE/XG4iLAot CQkJICBiaXRzX2NoYW5nZWQpOwogCX0KIH0KKwordm9pZCBfX25vX3Byb2ZpbGUgbmF0aXZl X3dyaXRlX2NyNCh1bnNpZ25lZCBsb25nIHZhbCkKK3sKKwl1bnNpZ25lZCBsb25nIGJpdHNf Y2hhbmdlZCA9IDA7CisKKwlfX25hdGl2ZV93cml0ZV9jcjQodmFsLCAmYml0c19jaGFuZ2Vk KTsKKworCWlmICghYml0c19jaGFuZ2VkKQorCQlyZXR1cm4KKworCVdBUk5fT05DRShiaXRz X2NoYW5nZWQsICJwaW5uZWQgQ1I0IGJpdHMgY2hhbmdlZDogMHglbHghP1xuIiwKKwkJICBi aXRzX2NoYW5nZWQpOworfQorCit2b2lkIF9fbm9fcHJvZmlsZSBuYXRpdmVfd3JpdGVfY3I0 X25vd2Fybih1bnNpZ25lZCBsb25nIHZhbCkKK3sKKwl1bnNpZ25lZCBsb25nIGJpdHNfY2hh bmdlZCA9IDA7CisKKwlfX25hdGl2ZV93cml0ZV9jcjQodmFsLCAmYml0c19jaGFuZ2VkKTsK K30KKwogI2lmIElTX01PRFVMRShDT05GSUdfTEtEVE0pCiBFWFBPUlRfU1lNQk9MX0dQTChu YXRpdmVfd3JpdGVfY3I0KTsKICNlbmRpZgo= --------------n0n6ZXEhGiQA3ZVqsLB2u14D--