From patchwork Thu Feb 20 13:49:07 2025 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Marc Zyngier X-Patchwork-Id: 13984001 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 445361FDA83; Thu, 20 Feb 2025 13:49:16 +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=1740059356; cv=none; b=Qy02oRAf77VzBBhqu7D1RIMvK3KxGF3Rf/WiBLBHYOrpNkU1j9Of6IDQ8sUnJSKGjmnY6nUduF9uUwYoLGWj4+vcdLUj3TmTlduqW8yhMyicyD5oDVIqp7/oy38c6AKNw59JLs3j6QJuNo9htZ/PCN0i618UYDcPKbP2jGSEy6Q= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1740059356; c=relaxed/simple; bh=ckzaA4fe/De/c/C7LV9KPu2PIvf0ztKKIvtA/g3YrnU=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=ASlAKv+X7788e7gU1axEkb8RbxFJV0ZjbtKj8eTGXgzjg6Y0zLKyXAg1UZDQYt/e6IZ3pbWa2TpLUgI2HP/knfeVADLw5SCCp5Ja42wY8UXY3exCBpSF4iNfUsp/7k9vbkstybsM2XgQkfwV4jl6+k48+g0IbiYx4l3eyPv8m5A= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=B6V7mlwP; 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="B6V7mlwP" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 261DDC4CED1; Thu, 20 Feb 2025 13:49:16 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1740059356; bh=ckzaA4fe/De/c/C7LV9KPu2PIvf0ztKKIvtA/g3YrnU=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=B6V7mlwPR//Kznj54B6u0iavm0DW0OzTlBEdfOLJvsE+XWE5Dbf/FYy755Zsbti5H RlYbu8gnNeX1otzX/y0LTyHAD4Y2X6ckwPIg3i+ySOLVtOwrJg/DPQZSajf2jGiVxs 2zTIRFzC24SATnblSH/uW1XuMKMcNiXGc5A7Uvsg9J6kWL0G8NfAH+Cs6HUDv/QW6q dV7ZMGbBxdLXGzFblKzLkJHU6p04TxKEOpI/LZmicNFqfGzQF/Bnf3I/Hk/36avOOp GE3CjEOAWERxtmJVPJ/e7qMskQ4cZruHSHlq+MiSA/iH0Ugn+3EN7FhoSpK8Ki597w UyXy99cyvhfZQ== Received: from sofa.misterjones.org ([185.219.108.64] helo=valley-girl.lan) by disco-boy.misterjones.org with esmtpsa (TLS1.3) tls TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384 (Exim 4.95) (envelope-from ) id 1tl6vS-006DXp-BF; Thu, 20 Feb 2025 13:49:14 +0000 From: Marc Zyngier To: kvmarm@lists.linux.dev, kvm@vger.kernel.org, linux-arm-kernel@lists.infradead.org Cc: Joey Gouly , Suzuki K Poulose , Oliver Upton , Zenghui Yu , Eric Auger , gankulkarni@os.amperecomputing.com Subject: [PATCH v2 14/14] KVM: arm64: Document NV caps and vcpu flags Date: Thu, 20 Feb 2025 13:49:07 +0000 Message-Id: <20250220134907.554085-15-maz@kernel.org> X-Mailer: git-send-email 2.39.2 In-Reply-To: <20250220134907.554085-1-maz@kernel.org> References: <20250220134907.554085-1-maz@kernel.org> Precedence: bulk X-Mailing-List: kvm@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-SA-Exim-Connect-IP: 185.219.108.64 X-SA-Exim-Rcpt-To: kvmarm@lists.linux.dev, kvm@vger.kernel.org, linux-arm-kernel@lists.infradead.org, joey.gouly@arm.com, suzuki.poulose@arm.com, oliver.upton@linux.dev, yuzenghui@huawei.com, eric.auger@redhat.com, gankulkarni@os.amperecomputing.com X-SA-Exim-Mail-From: maz@kernel.org X-SA-Exim-Scanned: No (on disco-boy.misterjones.org); SAEximRunCond expanded to false Describe the two new vcpu flags that control NV, together with the capabilities that advertise them. Reviewed-by: Oliver Upton Signed-off-by: Marc Zyngier --- Documentation/virt/kvm/api.rst | 14 +++++++++++++- 1 file changed, 13 insertions(+), 1 deletion(-) diff --git a/Documentation/virt/kvm/api.rst b/Documentation/virt/kvm/api.rst index 2b52eb77e29cb..2d7b516ae408d 100644 --- a/Documentation/virt/kvm/api.rst +++ b/Documentation/virt/kvm/api.rst @@ -3456,7 +3456,8 @@ The initial values are defined as: - FPSIMD/NEON registers: set to 0 - SVE registers: set to 0 - System registers: Reset to their architecturally defined - values as for a warm reset to EL1 (resp. SVC) + values as for a warm reset to EL1 (resp. SVC) or EL2 (in the + case of EL2 being enabled). Note that because some registers reflect machine topology, all vcpus should be created before this ioctl is invoked. @@ -3523,6 +3524,17 @@ Possible features: - the KVM_REG_ARM64_SVE_VLS pseudo-register is immutable, and can no longer be written using KVM_SET_ONE_REG. + - KVM_ARM_VCPU_HAS_EL2: Enable Nested Virtualisation support, + booting the guest from EL2 instead of EL1. + Depends on KVM_CAP_ARM_EL2. + The VM is running with HCR_EL2.E2H being RES1 (VHE) unless + KVM_ARM_VCPU_HAS_EL2_E2H0 is also set. + + - KVM_ARM_VCPU_HAS_EL2_E2H0: Restrict Nested Virtualisation + support to HCR_EL2.E2H being RES0 (non-VHE). + Depends on KVM_CAP_ARM_EL2_E2H0. + KVM_ARM_VCPU_HAS_EL2 must also be set. + 4.83 KVM_ARM_PREFERRED_TARGET -----------------------------