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 AC85E27602A; Wed, 14 May 2025 10:35:09 +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=1747218909; cv=none; b=O7FEmCybvXQTouumvjxZlXye5MH9fdOMX/TNHVe9/LZhJET6/7s7hv82vXYQkEZdUqoTEPk8/iZuv3mEHBZNufiIEWnqDU5Hfqbnc+ojxWf3lm6SrvZGyI81mgO6Aba1gqOMttYvfnfGSh4X09ORJhgfrxToWm9vf26/jQn6Z6s= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1747218909; c=relaxed/simple; bh=Dmj4/HJxUQOQdh1ZBw4viqpwCEPGdEuNbQNJlX78JYE=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=DwTHTCz05QR3sf51HYrdyVX7rDk75NYqmTyez8sfs8WqGJd00SpnVmIaXoi3Xopza04PsRZ+2fTyE92gm3cBDEPGIDBL6Kd/1fcpR/UjE5WYadAEAl2B/uU8e6gXFECOawmc75+OeqoS4u1HT8qIF+hwGycgdIZLMozPnBnMU/Q= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=n8dONTvf; 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="n8dONTvf" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 8EBB4C4CEF0; Wed, 14 May 2025 10:35:09 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1747218909; bh=Dmj4/HJxUQOQdh1ZBw4viqpwCEPGdEuNbQNJlX78JYE=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=n8dONTvfZcbjawJJjzBn+fnxUbg2Dh+FMDyaCZecpyjbEXdFMFba1ToX9g5AeEpTo jYFQ5hcypQrsRh8hNy2AQTFJI5Nh9Th6BJNjvNW6LQAmex5483wcoAccUxA0wvpo4T Xr8Fgpy1Kodh6oxgZDswXXhCwcUDDNovZuu+N5+AekcFV0irX5hEQPmMnEfvpkSRpT yjvrEJk8g+wlyj0g0Lz6SKNhOp2lNqJu4ma/kj6P/hWBT9ke/CDqT9mQ4soDoCHuTc xNE+XpOR0KMhe4Dz6obFxTJ1ZcYLvUh5jKFG/PP6w0uCXv7V+zfgUc4ZjRxyTKpvoh PdoXYyNftIRQA== 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 1uF9S7-00Eos3-R6; Wed, 14 May 2025 11:35:07 +0100 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 , Ganapatrao Kulkarni Subject: [PATCH v4 17/17] KVM: arm64: Document NV caps and vcpu flags Date: Wed, 14 May 2025 11:35:00 +0100 Message-Id: <20250514103501.2225951-18-maz@kernel.org> X-Mailer: git-send-email 2.39.2 In-Reply-To: <20250514103501.2225951-1-maz@kernel.org> References: <20250514103501.2225951-1-maz@kernel.org> Precedence: bulk X-Mailing-List: kvm@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 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 Reviewed-by: Joey Gouly 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 47c7c3f92314e..fe3d6b5d2acca 100644 --- a/Documentation/virt/kvm/api.rst +++ b/Documentation/virt/kvm/api.rst @@ -3460,7 +3460,8 @@ 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. @@ -3527,6 +3528,17 @@ 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 ----------------------------- -- 2.39.2