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 96C4DC624A4 for ; Mon, 31 Aug 2026 16:34:55 +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=CfsO4mfTe6upfBYmzUM23X2u/c4rA6Qp/1NqYaLuvkc=; b=jZAg6V8hculR51slmxWlvvCEdL c3WAFhnxToqigx7BgL2pWvBgKuHD6lT50otf0Ib185/KOK9H9RnJa6ZBxbmQOQpT+RtQ0b7NyAZi9 3ikk+RHkjNx8Y66bfXXYUv1gelQNbe+jwEDhMYjL8nGWnrXG1iXp1MBXZZSfbTjecofH8LbixRePE lo037jIvH9Y+vXGc7Lu+PzV8kl2Z++Zxd5rwSp0+TGCpmCW86CfIl4ZiNUGX2SJZOCLtcPMlBWQAg L6Wqk4xb9dEhH5nf4pNO5zEkPDp5WyRUAUyspVZqVBohs2U1zyUvVfKtxbxSmyXvLGulEvpk6nDoj 7ZnRWL8g==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.99.1 #2 (Red Hat Linux)) id 1x14y5-0000000A3fD-1jBk; Mon, 31 Aug 2026 16:34:45 +0000 Received: from desiato.infradead.org ([2001:8b0:10b:1:d65d:64ff:fe57:4e05]) by bombadil.infradead.org with esmtps (Exim 4.99.1 #2 (Red Hat Linux)) id 1x14xs-0000000A3Wl-2X1w for linux-arm-kernel@bombadil.infradead.org; Mon, 31 Aug 2026 16:34:32 +0000 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=desiato.20200630; h=Content-Transfer-Encoding:MIME-Version :References:In-Reply-To:Message-Id:Date:Subject:Cc:To:From:Sender:Reply-To: Content-Type:Content-ID:Content-Description; bh=CfsO4mfTe6upfBYmzUM23X2u/c4rA6Qp/1NqYaLuvkc=; b=IIJlMP562EeZzKXblib57lmP9C 8ity45QzOf+iUUEB6yTYGmgYRqY9yQ9XVdHe4XqYky/LVp0lGq802Lwi8Y9iRVVk2ULZtRtJveNnm 8qfsDKnooDw08C/szIVuDF3CWFwbn+yg+IuHTJr+qCJhCA1rDykQ2noeLF7Xg5rbav92vBWg7SYeh Ftr+GpDY37Ih4xFG2vwptXYvkU6NnqfW0EhYiSilJBvuBAomwjkojwb9nd25xdyO2XsFhH1yV+fLj 9JivgvuAj/HE17LByP6cVwy/pxZ7yvvx35Q+xW4lrXLt7whpMuGxMi0gWh4A9e7qFohPKrCqDG9z0 yliA4sqg==; Received: from out-179.mta1.migadu.com ([2001:41d0:203:375::b3] helo=mta1.migadu.com) by desiato.infradead.org with esmtps (Exim 4.99.2 #2 (Red Hat Linux)) id 1x14xp-0000000A3cn-1ruI for linux-arm-kernel@lists.infradead.org; Mon, 31 Aug 2026 16:34:31 +0000 X-Envelope-To: linux-arm-kernel@lists.infradead.org DKIM-Signature: a=rsa-sha256; bh=xkq1pK+JQIT20fKqr7d//bEzBjwmUGbNVIrU7IeZkOU=; c=simple/simple; d=linux.dev; h=from:to:subject:date:message-id:mime-version:content-type; s=key1; t=1788194064; v=1; x=1788798864; b=RfKXUbufu2N5juLudrfplKRLh7fG3qGc+sJpyLEQOh+RvIV5P+UGjMmiHXV6s7pys0tXjHIH iITcCpYB3o9w8FyXiW/jtLCFTVgc4I762BOubKmVEnrHj7GBj6VSUo68CVgH5K/wH4YSKjaFhDd 7kUAL8XAE5bYEDGVUlj+LoUQ= X-Envelope-To: linux-arm-kernel@lists.infradead.org Received: by smtp.migadu.com with ESMTPS id 83b96d24d68e6398; Mon, 31 Aug 2026 16:34:24 +0000 X-Mizu-Trace-ID: 83b96d24d68e6398 X-Migadu-Flow: FLOW_OUT From: Fuad Tabba To: Marc Zyngier , Oliver Upton , kvmarm@lists.linux.dev, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org Cc: Catalin Marinas , Will Deacon , Joey Gouly , Steffen Eiden , Suzuki K Poulose , Zenghui Yu , Vincent Donnefort , Quentin Perret , Fuad Tabba Subject: [PATCH 03/17] KVM: arm64: Reject the PVTIME vCPU attribute for protected VMs Date: Mon, 31 Aug 2026 17:34:07 +0100 Message-Id: <20260831163421.272420-4-fuad.tabba@linux.dev> X-Mailer: git-send-email 2.39.5 In-Reply-To: <20260831163421.272420-1-fuad.tabba@linux.dev> References: <20260831163421.272420-1-fuad.tabba@linux.dev> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.9.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20260831_173429_577344_A69B9152 X-CRM114-Status: UNSURE ( 9.76 ) X-CRM114-Notice: Please train this message. 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 currently does not support steal time for protected guests: KVM_CAP_STEAL_TIME reports 0 for them. The host still accepts the KVM_ARM_VCPU_PVTIME_CTRL attribute, whose IPA would point kvm_update_stolen_time() at the guest's private memory on every vCPU load. Return -EPERM for the attribute group instead. Signed-off-by: Fuad Tabba --- arch/arm64/kvm/guest.c | 10 ++++++++++ 1 file changed, 10 insertions(+) diff --git a/arch/arm64/kvm/guest.c b/arch/arm64/kvm/guest.c index b01d6622b8720..23f725e2cf745 100644 --- a/arch/arm64/kvm/guest.c +++ b/arch/arm64/kvm/guest.c @@ -916,6 +916,10 @@ int kvm_arm_vcpu_arch_set_attr(struct kvm_vcpu *vcpu, ret = kvm_arm_timer_set_attr(vcpu, attr); break; case KVM_ARM_VCPU_PVTIME_CTRL: + /* Steal time is not offered to protected guests. */ + if (kvm_vm_is_protected(vcpu->kvm)) + return -EPERM; + ret = kvm_arm_pvtime_set_attr(vcpu, attr); break; default: @@ -939,6 +943,9 @@ int kvm_arm_vcpu_arch_get_attr(struct kvm_vcpu *vcpu, ret = kvm_arm_timer_get_attr(vcpu, attr); break; case KVM_ARM_VCPU_PVTIME_CTRL: + if (kvm_vm_is_protected(vcpu->kvm)) + return -EPERM; + ret = kvm_arm_pvtime_get_attr(vcpu, attr); break; default: @@ -962,6 +969,9 @@ int kvm_arm_vcpu_arch_has_attr(struct kvm_vcpu *vcpu, ret = kvm_arm_timer_has_attr(vcpu, attr); break; case KVM_ARM_VCPU_PVTIME_CTRL: + if (kvm_vm_is_protected(vcpu->kvm)) + return -EPERM; + ret = kvm_arm_pvtime_has_attr(vcpu, attr); break; default: -- 2.39.5