From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id A5DBB2FD681 for ; Mon, 30 Mar 2026 14:50:07 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1774882207; cv=none; b=GA2uvbskckKQYWIgdbti21ykNxxGkdaBKRdY6Joh7FELMadLQcvOZjVvqPXlaZhsL4FA+aPZ0o/VrDgF8+yUbNvexGw5zJnzjDOleThpYBHmRjxwt3Aq6Rt3f1EaiMaofOdAu9+MSWmZOG7Rkd30dfQR/Fsdzb+ZK53OfOBEs7o= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1774882207; c=relaxed/simple; bh=tDDm+SzKUoz2fWZ2GjfXbiq4GHf2/6hOrZ04uxz3XhY=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=GUiwSk7Nr7NUD7K9tFKkshMFe5cJBeaewWAVOwk5GmYMi3MlOn+GBDzBXhKypjqyAzrDp3JOMRDVhkQwv3cSZ6BbK+eosowfb6DL23GGFlVte3+vpDQ69qR0eSUAivNP7mcQl2qVUK2G127fLjl+jrD71n1wcUyf3+UEGUCrZpM= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=BsvYUlqA; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="BsvYUlqA" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 8031AC2BCB1; Mon, 30 Mar 2026 14:50:04 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1774882207; bh=tDDm+SzKUoz2fWZ2GjfXbiq4GHf2/6hOrZ04uxz3XhY=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=BsvYUlqAvj+AisWxnslnzQtbakQylr2jrh9m9Uu4pDiFlP/E40DpvEeAFJCWCN/Ys ObKuSJvCoboGHby/Da/IGEryRrhyyW6fDnvieas6eScCWCitfEPPOQr4/LPD1m3waQ QXMNFN8UJw4+p4LPJVfgHFx/hBL/vw1aQJ6mSq5+ep9G38gFh6GEVxgWVr7IBwsouw RVstaJDkKP54Lb1aLqQRpZuf7GUeesvSECKWCZ/yanFU4A9PLGmPTHLFL4UV6O59d5 9y1q4k5CeyTxkks0QkHDxCqzyP9tpNPHOwiAnT9+YKyFC8PkrlrLcL+1B3C9ulx33n 7+aHtv0J/exDQ== From: Will Deacon To: kvmarm@lists.linux.dev Cc: linux-arm-kernel@lists.infradead.org, Will Deacon , Marc Zyngier , Oliver Upton , Joey Gouly , Suzuki K Poulose , Zenghui Yu , Catalin Marinas , Quentin Perret , Fuad Tabba , Vincent Donnefort , Mostafa Saleh , Alexandru Elisei Subject: [PATCH v5 23/38] KVM: arm64: Change 'pkvm_handle_t' to u16 Date: Mon, 30 Mar 2026 15:48:24 +0100 Message-ID: <20260330144841.26181-24-will@kernel.org> X-Mailer: git-send-email 2.47.3 In-Reply-To: <20260330144841.26181-1-will@kernel.org> References: <20260330144841.26181-1-will@kernel.org> Precedence: bulk X-Mailing-List: kvmarm@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 'pkvm_handle_t' doesn't need to be a 32-bit type and subsequent patches will rely on it being no more than 16 bits so that it can be encoded into a pte annotation. Change 'pkvm_handle_t' to a u16 and add a compile-type check that the maximum handle fits into the reduced type. Reviewed-by: Fuad Tabba Tested-by: Fuad Tabba Tested-by: Mostafa Saleh Signed-off-by: Will Deacon --- arch/arm64/include/asm/kvm_host.h | 2 +- arch/arm64/kvm/hyp/nvhe/pkvm.c | 1 + 2 files changed, 2 insertions(+), 1 deletion(-) diff --git a/arch/arm64/include/asm/kvm_host.h b/arch/arm64/include/asm/kvm_host.h index 31b9454bb74d..0c5e7ce5f187 100644 --- a/arch/arm64/include/asm/kvm_host.h +++ b/arch/arm64/include/asm/kvm_host.h @@ -247,7 +247,7 @@ struct kvm_smccc_features { unsigned long vendor_hyp_bmap_2; /* Function numbers 64-127 */ }; -typedef unsigned int pkvm_handle_t; +typedef u16 pkvm_handle_t; struct kvm_protected_vm { pkvm_handle_t handle; diff --git a/arch/arm64/kvm/hyp/nvhe/pkvm.c b/arch/arm64/kvm/hyp/nvhe/pkvm.c index 092e9d0e55ac..0ba6423cd0d5 100644 --- a/arch/arm64/kvm/hyp/nvhe/pkvm.c +++ b/arch/arm64/kvm/hyp/nvhe/pkvm.c @@ -222,6 +222,7 @@ static struct pkvm_hyp_vm **vm_table; void pkvm_hyp_vm_table_init(void *tbl) { + BUILD_BUG_ON((u64)HANDLE_OFFSET + KVM_MAX_PVMS > (pkvm_handle_t)-1); WARN_ON(vm_table); vm_table = tbl; } -- 2.53.0.1018.g2bb0e51243-goog