From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 3DB05C433F5 for ; Thu, 12 May 2022 03:19:46 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S245183AbiELDTo (ORCPT ); Wed, 11 May 2022 23:19:44 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:60650 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1343817AbiELDTi (ORCPT ); Wed, 11 May 2022 23:19:38 -0400 Received: from mga07.intel.com (mga07.intel.com [134.134.136.100]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 697A7216840 for ; Wed, 11 May 2022 20:19:30 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1652325571; x=1683861571; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=R9h4w0pCPp14sIEtG3F0VIeqzIAbZClYZpCxsNGADFA=; b=HSkPkRvST5hl4GdVupvj9Uq0aSAKUDolwcFD8IDE5gnsEAl2jHiPNh6C hzMBRtzjXXHINmO2KTOU3OLB70YrY/vzIvQfK+IikUTLYfMZYXXv9TPBx fkFyaUjqRQOzp4bajBgVBJ9UxzlEEgCMEJo3iMFH8IJWj7xPFpyljWk+i guOjd5aFxAwm47dOru0uagOicOhMYjPixys46a42F3okXr4wUVsWEhEw3 y9fwn1MxTKnpT5wKflSFNNRlcwm/bTHf06MA80tP0sMWzi3Vnht1apSPI uJjWY+4AaD7OEnC93NDd9sWH+Y8DpJwQMJcUKa8Cep5tE3+jDlINk6Ufi A==; X-IronPort-AV: E=McAfee;i="6400,9594,10344"; a="332914855" X-IronPort-AV: E=Sophos;i="5.91,218,1647327600"; d="scan'208";a="332914855" Received: from orsmga008.jf.intel.com ([10.7.209.65]) by orsmga105.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 11 May 2022 20:19:02 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.91,218,1647327600"; d="scan'208";a="594455640" Received: from lxy-dell.sh.intel.com ([10.239.159.55]) by orsmga008.jf.intel.com with ESMTP; 11 May 2022 20:18:57 -0700 From: Xiaoyao Li To: Paolo Bonzini , Isaku Yamahata , isaku.yamahata@intel.com, Gerd Hoffmann , =?UTF-8?q?Daniel=20P=20=2E=20Berrang=C3=A9?= , =?UTF-8?q?Philippe=20Mathieu-Daud=C3=A9?= , Richard Henderson , "Michael S . Tsirkin" , Marcel Apfelbaum , Cornelia Huck , Marcelo Tosatti , Laszlo Ersek , Eric Blake Cc: Connor Kuehl , erdemaktas@google.com, kvm@vger.kernel.org, qemu-devel@nongnu.org, seanjc@google.com, xiaoyao.li@intel.com Subject: [RFC PATCH v4 11/36] i386/tdx: Initialize TDX before creating TD vcpus Date: Thu, 12 May 2022 11:17:38 +0800 Message-Id: <20220512031803.3315890-12-xiaoyao.li@intel.com> X-Mailer: git-send-email 2.27.0 In-Reply-To: <20220512031803.3315890-1-xiaoyao.li@intel.com> References: <20220512031803.3315890-1-xiaoyao.li@intel.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org Invoke KVM_TDX_INIT in kvm_arch_pre_create_vcpu() that KVM_TDX_INIT configures global TD state, e.g. the canonical CPUID config, and must be executed prior to creating vCPUs. Use kvm_x86_arch_cpuid() to setup the CPUID settings for TDX VM and tie x86cpu->enable_pmu with TD's attributes. Note, this doesn't address the fact that QEMU may change the CPUID configuration when creating vCPUs, i.e. punts on refactoring QEMU to provide a stable CPUID config prior to kvm_arch_init(). Signed-off-by: Xiaoyao Li --- accel/kvm/kvm-all.c | 9 ++++++++- target/i386/kvm/kvm.c | 8 ++++++++ target/i386/kvm/tdx-stub.c | 5 +++++ target/i386/kvm/tdx.c | 35 +++++++++++++++++++++++++++++++++++ target/i386/kvm/tdx.h | 4 ++++ 5 files changed, 60 insertions(+), 1 deletion(-) diff --git a/accel/kvm/kvm-all.c b/accel/kvm/kvm-all.c index e6fa9d23207a..88468878d181 100644 --- a/accel/kvm/kvm-all.c +++ b/accel/kvm/kvm-all.c @@ -470,10 +470,17 @@ int kvm_init_vcpu(CPUState *cpu, Error **errp) trace_kvm_init_vcpu(cpu->cpu_index, kvm_arch_vcpu_id(cpu)); + /* + * tdx_pre_create_vcpu() may call cpu_x86_cpuid(). It in turn may call + * kvm_vm_ioctl(). Set cpu->kvm_state in advance to avoid NULL pointer + * dereference. + */ + cpu->kvm_state = s; ret = kvm_arch_pre_create_vcpu(cpu); if (ret < 0) { error_setg_errno(errp, -ret, "kvm_init_vcpu: kvm_arch_pre_create_vcpu() failed"); + cpu->kvm_state = NULL; goto err; } @@ -481,11 +488,11 @@ int kvm_init_vcpu(CPUState *cpu, Error **errp) if (ret < 0) { error_setg_errno(errp, -ret, "kvm_init_vcpu: kvm_get_vcpu failed (%lu)", kvm_arch_vcpu_id(cpu)); + cpu->kvm_state = NULL; goto err; } cpu->kvm_fd = ret; - cpu->kvm_state = s; cpu->vcpu_dirty = true; cpu->dirty_pages = 0; diff --git a/target/i386/kvm/kvm.c b/target/i386/kvm/kvm.c index 5be151e6499b..f2d7c3cf59ac 100644 --- a/target/i386/kvm/kvm.c +++ b/target/i386/kvm/kvm.c @@ -2175,6 +2175,14 @@ int kvm_arch_init_vcpu(CPUState *cs) return r; } +int kvm_arch_pre_create_vcpu(CPUState *cpu) +{ + if (is_tdx_vm()) + return tdx_pre_create_vcpu(cpu); + + return 0; +} + int kvm_arch_destroy_vcpu(CPUState *cs) { X86CPU *cpu = X86_CPU(cs); diff --git a/target/i386/kvm/tdx-stub.c b/target/i386/kvm/tdx-stub.c index 1df24735201e..2871de9d7b56 100644 --- a/target/i386/kvm/tdx-stub.c +++ b/target/i386/kvm/tdx-stub.c @@ -7,3 +7,8 @@ int tdx_kvm_init(MachineState *ms, Error **errp) { return -EINVAL; } + +int tdx_pre_create_vcpu(CPUState *cpu) +{ + return -EINVAL; +} diff --git a/target/i386/kvm/tdx.c b/target/i386/kvm/tdx.c index 6e3b15ba8a4a..3472b59c2dbb 100644 --- a/target/i386/kvm/tdx.c +++ b/target/i386/kvm/tdx.c @@ -18,6 +18,7 @@ #include "sysemu/kvm.h" #include "hw/i386/x86.h" +#include "kvm_i386.h" #include "tdx.h" #define TDX_SUPPORTED_KVM_FEATURES ((1ULL << KVM_FEATURE_NOP_IO_DELAY) | \ @@ -165,6 +166,38 @@ void tdx_get_supported_cpuid(uint32_t function, uint32_t index, int reg, } } +int tdx_pre_create_vcpu(CPUState *cpu) +{ + MachineState *ms = MACHINE(qdev_get_machine()); + X86CPU *x86cpu = X86_CPU(cpu); + CPUX86State *env = &x86cpu->env; + struct kvm_tdx_init_vm init_vm; + int r = 0; + + qemu_mutex_lock(&tdx_guest->lock); + if (tdx_guest->initialized) { + goto out; + } + + memset(&init_vm, 0, sizeof(init_vm)); + init_vm.cpuid.nent = kvm_x86_arch_cpuid(env, init_vm.entries, 0); + + init_vm.attributes = tdx_guest->attributes; + init_vm.max_vcpus = ms->smp.cpus; + + r = tdx_vm_ioctl(KVM_TDX_INIT_VM, 0, &init_vm); + if (r < 0) { + error_report("KVM_TDX_INIT_VM failed %s", strerror(-r)); + goto out; + } + + tdx_guest->initialized = true; + +out: + qemu_mutex_unlock(&tdx_guest->lock); + return r; +} + /* tdx guest */ OBJECT_DEFINE_TYPE_WITH_INTERFACES(TdxGuest, tdx_guest, @@ -177,6 +210,8 @@ static void tdx_guest_init(Object *obj) { TdxGuest *tdx = TDX_GUEST(obj); + qemu_mutex_init(&tdx->lock); + tdx->attributes = 0; } diff --git a/target/i386/kvm/tdx.h b/target/i386/kvm/tdx.h index 06599b65b827..46a24ee8c7cc 100644 --- a/target/i386/kvm/tdx.h +++ b/target/i386/kvm/tdx.h @@ -17,6 +17,9 @@ typedef struct TdxGuestClass { typedef struct TdxGuest { ConfidentialGuestSupport parent_obj; + QemuMutex lock; + + bool initialized; uint64_t attributes; /* TD attributes */ } TdxGuest; @@ -29,5 +32,6 @@ bool is_tdx_vm(void); int tdx_kvm_init(MachineState *ms, Error **errp); void tdx_get_supported_cpuid(uint32_t function, uint32_t index, int reg, uint32_t *ret); +int tdx_pre_create_vcpu(CPUState *cpu); #endif /* QEMU_I386_TDX_H */ -- 2.27.0