From nobody Sat Feb 7 19:41:14 2026 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 72ED6EB64DA for ; Wed, 5 Jul 2023 17:16:43 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231459AbjGERQm (ORCPT ); Wed, 5 Jul 2023 13:16:42 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:41464 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232342AbjGERQk (ORCPT ); Wed, 5 Jul 2023 13:16:40 -0400 Received: from mail-wr1-x449.google.com (mail-wr1-x449.google.com [IPv6:2a00:1450:4864:20::449]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 99F5E1990 for ; Wed, 5 Jul 2023 10:16:38 -0700 (PDT) Received: by mail-wr1-x449.google.com with SMTP id ffacd0b85a97d-30e3ee8a42eso4014906f8f.1 for ; Wed, 05 Jul 2023 10:16:38 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20221208; t=1688577397; x=1691169397; h=cc:to:from:subject:message-id:mime-version:date:from:to:cc:subject :date:message-id:reply-to; bh=JinL7apUcf1gP8XFQ2zINdZou7Iz++svzqv8hjqcpG4=; b=qhATiPaQGUeviA9TREjpGVzTZx+eTBG89ShqA4kl7lRGvGT2pMGvWUaqt7NNkQzxyq /8PfVlQzl2LO6vi9TG7V/WxWFIjejptKtQ3gE+KS0fttIaQaez4asKtUnqd5AUYlLpuD awhMObsKdv38WIDH0dL6OgfJy5Ni8d4zakklW1EH4W0zfmNzHTBiGO0AhOyjihEADCxH Fg9FGroFeOnM7yzvUcvZ3ud/7en6PdC+nOVuASFjR7k1Q1TKyabCB3ANMsSDPWmGrMd3 dsBf2Q/ywjG5B7GVmP2r7lTkTjtFXCkkDKTM8UkQgRORQmnMuSdIO/t0keG1MCfuxilF 52pw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20221208; t=1688577397; x=1691169397; h=cc:to:from:subject:message-id:mime-version:date:x-gm-message-state :from:to:cc:subject:date:message-id:reply-to; bh=JinL7apUcf1gP8XFQ2zINdZou7Iz++svzqv8hjqcpG4=; b=greo7zrKYQ2XXQ2sozUSRKwQ8oVhLcpjemorIdUYFM2RHdsTy8k0WNvoqcnoS/52hz Em9x/du4NfC8CT/lf8nXwzMD6/bkicV0n9Zfp5d3xU9tr/WvVX9BdTm3vCEdD/MtKssW knqt8PEtJsDoAgtqm5k/E/UmmlYfEu/cXWpnf8MvoTNtOYaQuPfjCSqvSf+xZmtw9tba O3Mp+czPUtGqxVCKkV7Hdp0SVefPPUoeoMcMapYn7spBGRxXWjUOUvCTzhB6pD3FPzWm OiVbXt/E64k/nfolR/wvX76Rbx+mK+xcBpKVmVyDt6qSqBIAqWQ+JhZqVCuOlgb6lWX0 r46A== X-Gm-Message-State: ABy/qLZxfdeTSfOsEGqe/6/0hTbRSCP5sxeBvlIew2Mcc1hoSwEgmQgX oo53QwqpUi3UI2Tfrhew2mEPu01ID7r6QQ== X-Google-Smtp-Source: APBJJlFkHZZLMEUKPg1ln3ifk7FwbaHB5Cy7w0D302g94jAtmOYJbK1FmiBpCETF2/qG1bslXczmFq8a2EmO8w== X-Received: from mostafa.c.googlers.com ([fda3:e722:ac3:cc00:28:9cb1:c0a8:333c]) (user=smostafa job=sendgmr) by 2002:adf:dd0a:0:b0:313:ff50:2855 with SMTP id a10-20020adfdd0a000000b00313ff502855mr108174wrm.9.1688577396831; Wed, 05 Jul 2023 10:16:36 -0700 (PDT) Date: Wed, 5 Jul 2023 17:16:32 +0000 Mime-Version: 1.0 X-Mailer: git-send-email 2.41.0.255.g8b1d071c50-goog Message-ID: <20230705171632.3912123-1-smostafa@google.com> Subject: [PATCH] KVM: arm64: Add missing BTI instruction in kvm_host_psci_cpu_entry From: Mostafa Saleh To: maz@kernel.org, oliver.upton@linux.dev, linux-arm-kernel@lists.infradead.org, kvmarm@lists.linux.dev, linux-kernel@vger.kernel.org Cc: tabba@google.com, qperret@google.com, will@kernel.org, catalin.marinas@arm.com, yuzenghui@huawei.com, suzuki.poulose@arm.com, james.morse@arm.com, bgardon@google.com, gshan@redhat.com, sudeep.holla@arm.com, Mostafa Saleh Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" kvm_host_psci_cpu_entry is called from __kvm_hyp_init_cpu through "br" instruction as __kvm_hyp_init_cpu resides in idmap section while kvm_host_psci_cpu_entry is in hyp .text so the offset is larger than 26 bits covered by "b". Which means that this function should start with "bti j" instruction. LLVM which is the only compiler supporting BTI for Linux, adds "bti j" for jump tables or by when taking the address of the block [1]. And same behaviour is observed with GCC. As kvm_host_psci_cpu_entry is a C function, this must be done in assembly. Another solution is to use X16/X17 with "br", as according to ARM ARM DDI0487I.a RLJHCL/IGMGRS, PACIASP has an implicit branch target identification instruction that is compatible with PSTATE.BTYPE 0b01 which includes "br X16/X17" And the kvm_host_psci_cpu_entry has PACIASP as it is an external function. Although I see that using explicit "bti" makes more clear than relying on which register is used. A third solution is to clear SCTLR_EL2.BT, which would make PACIASP compatible PSTATE.BTYPE 0b11 ( "br" to other registers). However this deviates from the kernel behaviour (in bti_enable()). [1] https://reviews.llvm.org/D52867 Fixes: b53d4a272349 ("KVM: arm64: Use BTI for nvhe") Signed-off-by: Mostafa Saleh Reported-and-tested-by: Sudeep Holla --- arch/arm64/kvm/hyp/nvhe/host.S | 10 ++++++++++ arch/arm64/kvm/hyp/nvhe/psci-relay.c | 2 +- 2 files changed, 11 insertions(+), 1 deletion(-) diff --git a/arch/arm64/kvm/hyp/nvhe/host.S b/arch/arm64/kvm/hyp/nvhe/host.S index c87c63133e10..9d6e95b32097 100644 --- a/arch/arm64/kvm/hyp/nvhe/host.S +++ b/arch/arm64/kvm/hyp/nvhe/host.S @@ -297,3 +297,13 @@ SYM_CODE_START(__kvm_hyp_host_forward_smc) =20 ret SYM_CODE_END(__kvm_hyp_host_forward_smc) + +/* + * kvm_host_psci_cpu_entry is called through br instruction, which requires + * BTI J instruction, compilers (gcc and llvm) doesn't insert BTI J for ex= ternal + * functions, but BTI C instead. + */ +SYM_CODE_START(kvm_host_psci_cpu_entry) + bti j + b __kvm_host_psci_cpu_entry +SYM_CODE_END(kvm_host_psci_cpu_entry) diff --git a/arch/arm64/kvm/hyp/nvhe/psci-relay.c b/arch/arm64/kvm/hyp/nvhe= /psci-relay.c index 08508783ec3d..24543d2a3490 100644 --- a/arch/arm64/kvm/hyp/nvhe/psci-relay.c +++ b/arch/arm64/kvm/hyp/nvhe/psci-relay.c @@ -200,7 +200,7 @@ static int psci_system_suspend(u64 func_id, struct kvm_= cpu_context *host_ctxt) __hyp_pa(init_params), 0); } =20 -asmlinkage void __noreturn kvm_host_psci_cpu_entry(bool is_cpu_on) +asmlinkage void __noreturn __kvm_host_psci_cpu_entry(bool is_cpu_on) { struct psci_boot_args *boot_args; struct kvm_cpu_context *host_ctxt; --=20 2.41.0.255.g8b1d071c50-goog