From mboxrd@z Thu Jan 1 00:00:00 1970 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 bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 5CAE5C88E7F for ; Tue, 15 Sep 2026 16:02:43 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender:List-Subscribe:List-Help :List-Post:List-Archive:List-Unsubscribe:List-Id:Content-Transfer-Encoding: MIME-Version:References:In-Reply-To:Message-ID:Date:Subject:Cc:To:From: Reply-To:Content-Type:Content-ID:Content-Description:Resent-Date:Resent-From: Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=YkbxME8Dt2OsFBNnBEgiDClUVkvKnxhmQmdxoM6LavQ=; b=eEIjh/A12fNLddTe7jGnF3yqFd 0ahTcAtnkYqKJlVs+wd9h+ayKAYU5qYrsB2VPRK+ZNMy2Mo4SiFpLJcto5BVl+amDPqEOy4+IOWgt 0jNgKpYpT2j1xu3N3OqI8OqG5BA4XYft/HLIwFdS60EyFJ1gDGJsTaOWrmZkZdWT+sUYgXBZfNkQj jZf2ztLiDn5l13nOZTEmMC3AivBT4HvdN04odGZu5/vwd0Bx58CoWAV/o9jMJQQayzuiH+XoC81QO LsiRKhIwZ9UCs504yPSmrAUmsEAx96s5pr/dvx1yn8z8GTfXXAWKSelyp8NiOOYtXyOZxCp/45GyH 2uSZ43Kg==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.99.1 #2 (Red Hat Linux)) id 1x6VcD-00000007LO5-1euO; Tue, 15 Sep 2026 16:02:37 +0000 Received: from foss.arm.com ([217.140.110.172]) by bombadil.infradead.org with esmtp (Exim 4.99.1 #2 (Red Hat Linux)) id 1x6Vc8-00000007LJz-34Uv for linux-arm-kernel@lists.infradead.org; Tue, 15 Sep 2026 16:02:33 +0000 Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.121.207.14]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id 8F36215A1; Tue, 15 Sep 2026 09:02:28 -0700 (PDT) Received: from ewhatever.cambridge.arm.com (ewhatever.cambridge.arm.com [10.2.197.99]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPA id 77E883F882; Tue, 15 Sep 2026 09:02:29 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=simple/simple; d=arm.com; s=foss; t=1789488152; bh=j4bM4Le2AKal5yA6XAi5DmpI3S/KrZ5K/Wzmf15T0ZE=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=ClzThnsvV0+f2nZe1I9A9CL5T0IFtVNFtDYXmBqMUKy7p9ELACjh0Ha7pRHGIj4sQ 68my1T9P80v3Ia1OsjWhaWL7ckX5so/M5GWZSFkcr9JHRNhaf7wWuasgcuObUGbPVQ PP/+qzn+CvhwZfT+DOXHMcbdyYCO42GZClAvvn3k= From: Suzuki K Poulose To: kvm@vger.kernel.org, kvmarm@lists.linux.dev Cc: maz@kernel.org, will@kernel.org, catalin.marinas@arm.com, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, steven.price@arm.com, aneesh.kumar@kernel.org, oupton@kernel.org, gshan@redhat.com, joey.gouly@arm.com, tabba@google.com, yuzenghui@huawei.com, linux-coco@lists.linux.dev, gankulkarni@os.amperecomputing.com, sdonthineni@nvidia.com, alpergun@google.com, fj0570is@fujitsu.com, WeiLin.Chang@arm.com, lpieralisi@kernel.org, enju.kohei@fujitsu.com, Suzuki K Poulose Subject: [PATCH v18 13/23] KVM: arm64: Add a helper for VMs running on hyp that don't trust the host Date: Tue, 15 Sep 2026 17:01:31 +0100 Message-ID: <20260915160141.3543048-14-suzuki.poulose@arm.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20260915160141.3543048-1-suzuki.poulose@arm.com> References: <20260915160141.3543048-1-suzuki.poulose@arm.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.9.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20260915_090232_843492_C4290415 X-CRM114-Status: GOOD ( 12.44 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org PKVM and RMM, both do not trust the host. Add a helper to detect the VMs that have "distrusting" hyp. Use this for blocking ioremap of vgic-v2 into stage2. Signed-off-by: Suzuki K Poulose --- arch/arm64/include/asm/kvm_host.h | 3 +++ arch/arm64/kvm/mmu.c | 2 +- 2 files changed, 4 insertions(+), 1 deletion(-) diff --git a/arch/arm64/include/asm/kvm_host.h b/arch/arm64/include/asm/kvm_host.h index 1bb43c57fb0f0..09910b2c61bfb 100644 --- a/arch/arm64/include/asm/kvm_host.h +++ b/arch/arm64/include/asm/kvm_host.h @@ -328,6 +328,8 @@ enum fgt_group_id { enum kvm_arm_vm_flavor { VM_NVHE, VM_VHE, + /* VMs running on a hyp that doesn't trust */ + MARKER(__VM_DISTRUSTING_HYP), VM_PKVM, /* Normal guests on pKVM */ MARKER(__VM_PROTECTED), VM_PROTECTED_PKVM, /* Protected VM */ @@ -1540,6 +1542,7 @@ struct kvm *kvm_arch_alloc_vm(void); #define kvm_vm_is_protected_pkvm(kvm) ((kvm)->arch.vm_flavor == VM_PROTECTED_PKVM) #define kvm_vm_is_unprotected_pkvm(kvm) ((kvm)->arch.vm_flavor == VM_PKVM) +#define kvm_vm_hyp_is_distrusting(kvm) ((kvm)->arch.vm_flavor > __VM_DISTRUSTING_HYP) #define kvm_vm_hyp_is_pkvm(kvm) (is_protected_kvm_enabled()) #define vcpu_is_protected(vcpu) kvm_vm_is_protected((vcpu)->kvm) diff --git a/arch/arm64/kvm/mmu.c b/arch/arm64/kvm/mmu.c index 38f3bf772278f..559a8286807cd 100644 --- a/arch/arm64/kvm/mmu.c +++ b/arch/arm64/kvm/mmu.c @@ -1251,7 +1251,7 @@ int kvm_phys_addr_ioremap(struct kvm *kvm, phys_addr_t guest_ipa, KVM_PGTABLE_PROT_R | (writable ? KVM_PGTABLE_PROT_W : 0); - if (is_protected_kvm_enabled()) + if (kvm_vm_hyp_is_distrusting(kvm)) return -EPERM; size += offset_in_page(guest_ipa); -- 2.43.0