Message ID | 20231119165721.9849-26-alexandru.elisei@arm.com (mailing list archive) |
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State | New |
Headers | show
Return-Path: <owner-linux-mm@kvack.org> X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by smtp.lore.kernel.org (Postfix) with ESMTP id 0AAD3C54FB9 for <linux-mm@archiver.kernel.org>; Sun, 19 Nov 2023 16:59:54 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id 9DDF86B03A3; Sun, 19 Nov 2023 11:59:53 -0500 (EST) Received: by kanga.kvack.org (Postfix, from userid 40) id 98E266B03A5; Sun, 19 Nov 2023 11:59:53 -0500 (EST) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 855EE6B03A7; Sun, 19 Nov 2023 11:59:53 -0500 (EST) X-Delivered-To: linux-mm@kvack.org Received: from relay.hostedemail.com (smtprelay0014.hostedemail.com [216.40.44.14]) by kanga.kvack.org (Postfix) with ESMTP id 749DA6B03A3 for <linux-mm@kvack.org>; Sun, 19 Nov 2023 11:59:53 -0500 (EST) Received: from smtpin04.hostedemail.com (a10.router.float.18 [10.200.18.1]) by unirelay05.hostedemail.com (Postfix) with ESMTP id 55B514014E for <linux-mm@kvack.org>; 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Series |
[RFC,v2,01/27] arm64: mte: Rework naming for tag manipulation functions
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diff --git a/arch/arm64/kvm/arm.c b/arch/arm64/kvm/arm.c index e5f75f1f1085..5b33c532c62a 100644 --- a/arch/arm64/kvm/arm.c +++ b/arch/arm64/kvm/arm.c @@ -29,6 +29,7 @@ #include <linux/uaccess.h> #include <asm/ptrace.h> #include <asm/mman.h> +#include <asm/mte_tag_storage.h> #include <asm/tlbflush.h> #include <asm/cacheflush.h> #include <asm/cpufeature.h> @@ -86,7 +87,8 @@ int kvm_vm_ioctl_enable_cap(struct kvm *kvm, break; case KVM_CAP_ARM_MTE: mutex_lock(&kvm->lock); - if (!system_supports_mte() || kvm->created_vcpus) { + if (!system_supports_mte() || tag_storage_enabled() || + kvm->created_vcpus) { r = -EINVAL; } else { r = 0; @@ -279,7 +281,7 @@ int kvm_vm_ioctl_check_extension(struct kvm *kvm, long ext) r = 1; break; case KVM_CAP_ARM_MTE: - r = system_supports_mte(); + r = system_supports_mte() && !tag_storage_enabled(); break; case KVM_CAP_STEAL_TIME: r = kvm_arm_pvtime_supported();
KVM allows MTE enabled VMs to be created when the backing VMA does not have MTE enabled. Without changes to how KVM allocates memory for a VM, it is impossible at the moment to discern when the corresponding tag storage needs to be reserved. For now, disable MTE in KVM if tag storage is enabled. Signed-off-by: Alexandru Elisei <alexandru.elisei@arm.com> --- arch/arm64/kvm/arm.c | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-)