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 D7DF729B21F; Wed, 23 Apr 2025 15:15:19 +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=1745421319; cv=none; b=e5Q7xAQfgXW6nBeDctE+nbUlgQ8g8cOOYZ99fEa7+sEJcj5snn8U3WlLUdqmfxzxVHkUk2jwBkubJYORzfTnIgw0qYwMqDk6k+D9MeW/WFU7ep0+IDec+lw+aM4G+T5Awkg7euOq3KRHQ6+OMhbHi/tU1lP3lvYwc2vNg986EXc= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1745421319; c=relaxed/simple; bh=Dmj4/HJxUQOQdh1ZBw4viqpwCEPGdEuNbQNJlX78JYE=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=CD4v5gHBthjkmJAOP8Z/G52gcE8HBErg7iY5tJdKmntgOLzHjeYNaKsuFQT4UKEf0x4GhXzkNbWzpf5Nn1AAe1Jh0G2CknqIaVW5Q8KKhmlbA3V5diTa0MyCL2nMiHLWrbqLx8JkkeY86oAyV7g1dTTwbIe3AjqOVmHSwo3ocuQ= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=NuJAOrtk; 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="NuJAOrtk" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 68AAAC4CEEC; Wed, 23 Apr 2025 15:15:19 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1745421319; bh=Dmj4/HJxUQOQdh1ZBw4viqpwCEPGdEuNbQNJlX78JYE=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=NuJAOrtkZKKjNnOvaNen3Bdi4lrJ7dy91yryb97XFVTugJ+P/GRH/QuR4JxEmop7E hCy+FvCyz2FnT0wM5Il9MCzDplbu17s05aXbtRhJ+0yaNaGBpNX5lkiY1mqk8tEqqf /5PuFjIgCnM1EBlUzfWYIUA30mqOW1S2y9hpLsgsssWxBy9lgHOA1kNYk4/4FlRChK xt2Uwx2RxtASa5IZFXwpE/ZZWQSoMSIJ2B589+HDW3sXRkNSCs9yRMvEygbHcfhNz7 QBy0Ip7sa8cFNZi246cdHmAJThx36JJcmhD/V/dm8W99LkavzUrzbYZojJ5EohBaDD DWNfI/Bj76s1g== 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 1u7boj-0082xr-IU; Wed, 23 Apr 2025 16:15:17 +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 v3 17/17] KVM: arm64: Document NV caps and vcpu flags Date: Wed, 23 Apr 2025 16:15:08 +0100 Message-Id: <20250423151508.2961768-18-maz@kernel.org> X-Mailer: git-send-email 2.39.2 In-Reply-To: <20250423151508.2961768-1-maz@kernel.org> References: <20250423151508.2961768-1-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