From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mta0.migadu.com (out-12.mta0.migadu.com [91.218.175.12]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id B74AD526A9A for ; Tue, 8 Sep 2026 11:07:25 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=91.218.175.12 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1788865650; cv=none; b=sxo5QlhcJh6c1nE7QjhUgYG7LSLbZ2VnnA9GE0HhHPFFeVgwyQNC5py8jl84OosgCnevEVUxfhMztm2nTd85LxKUYqEYCZwKcXUtWLspCum6H8ux90CZM0JeJV5KppU+qSm7oakIzt0Z+YCalzi8zkbPj3nC92UUVhbOtV5ntms= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1788865650; c=relaxed/simple; bh=DqhRUW75apnnRm/+NgVuUwPZB14lDLNVV5b0Gd4lk2M=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=AGuXY9G/qtRIVPVMiwDioizlya98uaMbfaFTg/X6V2POoLoWSHXbGb6jIesbL6wxO+4LGqyyr70wMNaHRNw5AGM+Fe/R0Xyx/I5TGU0b8vPfRB/2O5mWUJCGpRnkJnVQ0hrL2JPZWZXEpEmc1HdUBdtFWgKBwmMfTdHlTJarPHY= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.dev; spf=pass smtp.mailfrom=linux.dev; dkim=pass (1024-bit key) header.d=linux.dev header.i=@linux.dev header.b=FY3PH6e4; arc=none smtp.client-ip=91.218.175.12 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.dev Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=linux.dev Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linux.dev header.i=@linux.dev header.b="FY3PH6e4" X-Envelope-To: linux-kernel@vger.kernel.org DKIM-Signature: a=rsa-sha256; bh=DqhRUW75apnnRm/+NgVuUwPZB14lDLNVV5b0Gd4lk2M=; c=simple/simple; d=linux.dev; h=from:to:subject:date:message-id:mime-version:content-type; s=key1; t=1788865643; v=1; x=1789470443; b=FY3PH6e4/aYAD4gMScM9UVHyVreFsVQy0ehzn3Ul7lA4Ok8aMo5YJtREe2gK8WO3ZNWHPdVQ VqpQsEyfnPgMIofhh3IxjpYsazAxmONZvQrcw52uxHV0s8dHDHtgfY20aHO1kB1fO8MPyMimsBu v8tTj891DabCsbMH2koAMVSk= X-Envelope-To: linux-kernel@vger.kernel.org Received: by smtp.migadu.com with ESMTPS id b5834c5c726827b5; Tue, 08 Sep 2026 11:07:22 +0000 X-Mizu-Trace-ID: b5834c5c726827b5 X-Migadu-Flow: FLOW_OUT From: Fuad Tabba To: Marc Zyngier , Oliver Upton Cc: Will Deacon , Catalin Marinas , Joey Gouly , Suzuki K Poulose , Zenghui Yu , Steffen Eiden , Mark Rutland , Vincent Donnefort , Keir Fraser , Kalesh Singh , Quentin Perret , Hiroyuki Katsura , Fuad Tabba , stable@vger.kernel.org, kvmarm@lists.linux.dev, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org Subject: [PATCH 1/4] KVM: arm64: Transfer the hyp stack pages out of the host stage-2 Date: Tue, 8 Sep 2026 12:07:10 +0100 Message-Id: <20260908110713.1540304-2-fuad.tabba@linux.dev> X-Mailer: git-send-email 2.39.5 In-Reply-To: <20260908110713.1540304-1-fuad.tabba@linux.dev> References: <20260908110713.1540304-1-fuad.tabba@linux.dev> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit fix_host_ownership() walks only the linear-map alias of each memblock region, and the per-CPU hyp stack, mapped in the private VA range for its guard page, has none. Walk each stack's VA range with the same walker. Fixes: 1a919b17ef012 ("KVM: arm64: Add guard pages for pKVM (protected nVHE) hypervisor stack") Reported-by: Hiroyuki Katsura Cc: stable@vger.kernel.org Signed-off-by: Fuad Tabba --- arch/arm64/kvm/hyp/nvhe/setup.c | 10 ++++++++++ 1 file changed, 10 insertions(+) diff --git a/arch/arm64/kvm/hyp/nvhe/setup.c b/arch/arm64/kvm/hyp/nvhe/setup.c index 75b00c3233102..362f2891cb32e 100644 --- a/arch/arm64/kvm/hyp/nvhe/setup.c +++ b/arch/arm64/kvm/hyp/nvhe/setup.c @@ -269,6 +269,16 @@ static int fix_host_ownership(void) return ret; } + /* The stacks sit in the private VA range, not the linear map. */ + for (i = 0; i < hyp_nr_cpus; i++) { + struct kvm_nvhe_init_params *params = per_cpu_ptr(&kvm_init_params, i); + u64 start = params->stack_hyp_va - NVHE_STACK_SIZE; + + ret = kvm_pgtable_walk(&pkvm_pgtable, start, NVHE_STACK_SIZE, &walker); + if (ret) + return ret; + } + return 0; } -- 2.39.5