From patchwork Mon Feb 26 08:26:47 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Isaku Yamahata X-Patchwork-Id: 13571539 Received: from mgamail.intel.com (unknown [192.198.163.8]) (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 D69681272C0; Mon, 26 Feb 2024 08:29:03 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=192.198.163.8 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1708936145; cv=none; b=XYDRQTr7w1g0qxXrykQS0H6tNkxtjsVKq6Czr79XNMkEbNo0pbKTICzpym/olO2AiKtbzn4tpv6QMQedd3UDaj+bL6lZaAbfhcclLe2JAP3mEkR9s/WBjWwN/QWmTBH2axJ2/AoFi1c1OTO8IAhc9kg15NA/tNJ6dPYZop27Um0= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1708936145; c=relaxed/simple; bh=b3kkpZaI6SioFJ/UllRObAK3OnMZFeZHEri4NH/LxV8=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=BJx/7ZdTfbByRpLXULA7I9dePyXNnXufahE7sPE6VZDMWnIFKJpB9w0QMJeKE5mu3WS/cLpr9+wEAb8PsBpXLFUeJWYNZO71MFcPgk3DBMRwNwwRfSFOPaNl37cSBWaFqtTW9fqtrPUJiKS/XvofzMqUUiSMG3d68eQRrUUM1po= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=intel.com; spf=pass smtp.mailfrom=intel.com; dkim=pass (2048-bit key) header.d=intel.com header.i=@intel.com header.b=CGFGMhNd; arc=none smtp.client-ip=192.198.163.8 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=intel.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=intel.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=intel.com header.i=@intel.com header.b="CGFGMhNd" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1708936144; x=1740472144; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=b3kkpZaI6SioFJ/UllRObAK3OnMZFeZHEri4NH/LxV8=; b=CGFGMhNdhkR9ceqe2onv0Kq4lcMhvUZUOWwucl0+vR1Cyxlr1lUm4nTq 2FpGfP0wwcL/EeqPX3ayi5zO5NsuLzeH5+fAjuN9eJ8MkunCOG1DqmNKM /1rJ1lpZw/pA7vcbPyuFKM7BcjJr0w4TNYvqAdDyb5BzeotP2QGzRhev3 Sf+3fevNrIaEJD97xpKDHIfKFSyMOeyYDMrcfiuoOiyi8zlLZeyxHU0/Q 536J3b//aVRyfsmwUljS/mY55vt6tDCd3v5whjXWJNyPK+hHztVx4hywH e4yAJiRVyh9tw5q2zVvNwzaH7PkoIFECnSDwioMpILOT60f9Ew8x/zkVq A==; X-IronPort-AV: E=McAfee;i="6600,9927,10995"; a="20751314" X-IronPort-AV: E=Sophos;i="6.06,185,1705392000"; d="scan'208";a="20751314" Received: from fmviesa008.fm.intel.com ([10.60.135.148]) by fmvoesa102.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 26 Feb 2024 00:29:03 -0800 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="6.06,185,1705392000"; d="scan'208";a="6735055" Received: from ls.sc.intel.com (HELO localhost) ([172.25.112.31]) by fmviesa008-auth.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 26 Feb 2024 00:29:03 -0800 From: isaku.yamahata@intel.com To: kvm@vger.kernel.org, linux-kernel@vger.kernel.org Cc: isaku.yamahata@intel.com, isaku.yamahata@gmail.com, Paolo Bonzini , erdemaktas@google.com, Sean Christopherson , Sagi Shahar , Kai Huang , chen.bo@intel.com, hang.yuan@intel.com, tina.zhang@intel.com Subject: [PATCH v19 105/130] KVM: TDX: handle KVM hypercall with TDG.VP.VMCALL Date: Mon, 26 Feb 2024 00:26:47 -0800 Message-Id: X-Mailer: git-send-email 2.25.1 In-Reply-To: References: Precedence: bulk X-Mailing-List: kvm@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 From: Isaku Yamahata The TDX Guest-Host communication interface (GHCI) specification defines the ABI for the guest TD to issue hypercall. It reserves vendor specific arguments for VMM specific use. Use it as KVM hypercall and handle it. Signed-off-by: Isaku Yamahata --- arch/x86/kvm/vmx/tdx.c | 33 +++++++++++++++++++++++++++++++++ 1 file changed, 33 insertions(+) diff --git a/arch/x86/kvm/vmx/tdx.c b/arch/x86/kvm/vmx/tdx.c index 0be58cd428b3..c8eb47591105 100644 --- a/arch/x86/kvm/vmx/tdx.c +++ b/arch/x86/kvm/vmx/tdx.c @@ -1008,8 +1008,41 @@ static int tdx_handle_triple_fault(struct kvm_vcpu *vcpu) return 0; } +static int tdx_emulate_vmcall(struct kvm_vcpu *vcpu) +{ + unsigned long nr, a0, a1, a2, a3, ret; + + /* + * ABI for KVM tdvmcall argument: + * In Guest-Hypervisor Communication Interface(GHCI) specification, + * Non-zero leaf number (R10 != 0) is defined to indicate + * vendor-specific. KVM uses this for KVM hypercall. NOTE: KVM + * hypercall number starts from one. Zero isn't used for KVM hypercall + * number. + * + * R10: KVM hypercall number + * arguments: R11, R12, R13, R14. + */ + nr = kvm_r10_read(vcpu); + a0 = kvm_r11_read(vcpu); + a1 = kvm_r12_read(vcpu); + a2 = kvm_r13_read(vcpu); + a3 = kvm_r14_read(vcpu); + + ret = __kvm_emulate_hypercall(vcpu, nr, a0, a1, a2, a3, true, 0); + + tdvmcall_set_return_code(vcpu, ret); + + if (nr == KVM_HC_MAP_GPA_RANGE && !ret) + return 0; + return 1; +} + static int handle_tdvmcall(struct kvm_vcpu *vcpu) { + if (tdvmcall_exit_type(vcpu)) + return tdx_emulate_vmcall(vcpu); + switch (tdvmcall_leaf(vcpu)) { default: break;