From patchwork Wed Aug 3 15:50:06 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Maxim Levitsky X-Patchwork-Id: 12935621 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 94CF2C19F28 for ; Wed, 3 Aug 2022 15:51:43 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S238374AbiHCPvi (ORCPT ); Wed, 3 Aug 2022 11:51:38 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:49648 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S236513AbiHCPvH (ORCPT ); Wed, 3 Aug 2022 11:51:07 -0400 Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.129.124]) by lindbergh.monkeyblade.net (Postfix) with ESMTP id D04F1DFA3 for ; Wed, 3 Aug 2022 08:50:56 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1659541855; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=2n5o7mheKtO8vvklO92VzMiud5N3yOqYKtpNEIS5Hpk=; b=h4grGN8531g+/k9qYOFk4mmWqDMYWN2JvyjK1fgxJ4t9uZdFdH5BVwkIlbMchIpZ6VSnkR 5IpoDPMiiD/hB1VaRYriYOrPnsGxhfzsnRS0lpwROZmATy6lL0lFKl2I6rE1Kzj3H31TP/ YOkRq5RDKun8sZcJlSQKYfk/oFohO4o= Received: from mimecast-mx02.redhat.com (mimecast-mx02.redhat.com [66.187.233.88]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id us-mta-389-ETP-vPSoN2KOmkDW-D7iGQ-1; Wed, 03 Aug 2022 11:50:51 -0400 X-MC-Unique: ETP-vPSoN2KOmkDW-D7iGQ-1 Received: from smtp.corp.redhat.com (int-mx03.intmail.prod.int.rdu2.redhat.com [10.11.54.3]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx02.redhat.com (Postfix) with ESMTPS id 6F032802E5C; Wed, 3 Aug 2022 15:50:50 +0000 (UTC) Received: from localhost.localdomain (unknown [10.40.194.242]) by smtp.corp.redhat.com (Postfix) with ESMTP id CC9C31121314; Wed, 3 Aug 2022 15:50:46 +0000 (UTC) From: Maxim Levitsky To: kvm@vger.kernel.org Cc: Borislav Petkov , Dave Hansen , linux-kernel@vger.kernel.org, Wanpeng Li , Maxim Levitsky , Ingo Molnar , Sean Christopherson , x86@kernel.org, Jim Mattson , Kees Cook , Thomas Gleixner , "H. Peter Anvin" , Joerg Roedel , Vitaly Kuznetsov , Paolo Bonzini Subject: [PATCH v3 08/13] KVM: x86: emulator/smm: use smram structs in the common code Date: Wed, 3 Aug 2022 18:50:06 +0300 Message-Id: <20220803155011.43721-9-mlevitsk@redhat.com> In-Reply-To: <20220803155011.43721-1-mlevitsk@redhat.com> References: <20220803155011.43721-1-mlevitsk@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.78 on 10.11.54.3 Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org Switch from using a raw array to 'union kvm_smram'. Signed-off-by: Maxim Levitsky --- arch/x86/include/asm/kvm_host.h | 5 +++-- arch/x86/kvm/emulate.c | 12 +++++++----- arch/x86/kvm/kvm_emulate.h | 3 ++- arch/x86/kvm/svm/svm.c | 8 ++++++-- arch/x86/kvm/vmx/vmx.c | 4 ++-- arch/x86/kvm/x86.c | 16 ++++++++-------- 6 files changed, 28 insertions(+), 20 deletions(-) diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_host.h index e8281d64a4315a..d752fabde94ad2 100644 --- a/arch/x86/include/asm/kvm_host.h +++ b/arch/x86/include/asm/kvm_host.h @@ -204,6 +204,7 @@ typedef enum exit_fastpath_completion fastpath_t; struct x86_emulate_ctxt; struct x86_exception; +union kvm_smram; enum x86_intercept; enum x86_intercept_stage; @@ -1600,8 +1601,8 @@ struct kvm_x86_ops { void (*setup_mce)(struct kvm_vcpu *vcpu); int (*smi_allowed)(struct kvm_vcpu *vcpu, bool for_injection); - int (*enter_smm)(struct kvm_vcpu *vcpu, char *smstate); - int (*leave_smm)(struct kvm_vcpu *vcpu, const char *smstate); + int (*enter_smm)(struct kvm_vcpu *vcpu, union kvm_smram *smram); + int (*leave_smm)(struct kvm_vcpu *vcpu, const union kvm_smram *smram); void (*enable_smi_window)(struct kvm_vcpu *vcpu); int (*mem_enc_ioctl)(struct kvm *kvm, void __user *argp); diff --git a/arch/x86/kvm/emulate.c b/arch/x86/kvm/emulate.c index 55d9328e6074a2..610978d00b52b0 100644 --- a/arch/x86/kvm/emulate.c +++ b/arch/x86/kvm/emulate.c @@ -2594,16 +2594,18 @@ static int rsm_load_state_64(struct x86_emulate_ctxt *ctxt, static int em_rsm(struct x86_emulate_ctxt *ctxt) { unsigned long cr0, cr4, efer; - char buf[512]; + const union kvm_smram smram; u64 smbase; int ret; + BUILD_BUG_ON(sizeof(smram) != 512); + if ((ctxt->ops->get_hflags(ctxt) & X86EMUL_SMM_MASK) == 0) return emulate_ud(ctxt); smbase = ctxt->ops->get_smbase(ctxt); - ret = ctxt->ops->read_phys(ctxt, smbase + 0xfe00, buf, sizeof(buf)); + ret = ctxt->ops->read_phys(ctxt, smbase + 0xfe00, (void *)&smram, sizeof(smram)); if (ret != X86EMUL_CONTINUE) return X86EMUL_UNHANDLEABLE; @@ -2653,15 +2655,15 @@ static int em_rsm(struct x86_emulate_ctxt *ctxt) * state (e.g. enter guest mode) before loading state from the SMM * state-save area. */ - if (ctxt->ops->leave_smm(ctxt, buf)) + if (ctxt->ops->leave_smm(ctxt, &smram)) goto emulate_shutdown; #ifdef CONFIG_X86_64 if (emulator_has_longmode(ctxt)) - ret = rsm_load_state_64(ctxt, buf); + ret = rsm_load_state_64(ctxt, (const char *)&smram); else #endif - ret = rsm_load_state_32(ctxt, buf); + ret = rsm_load_state_32(ctxt, (const char *)&smram); if (ret != X86EMUL_CONTINUE) goto emulate_shutdown; diff --git a/arch/x86/kvm/kvm_emulate.h b/arch/x86/kvm/kvm_emulate.h index dd0ae61e44a116..76c0b8e7890b5d 100644 --- a/arch/x86/kvm/kvm_emulate.h +++ b/arch/x86/kvm/kvm_emulate.h @@ -19,6 +19,7 @@ struct x86_emulate_ctxt; enum x86_intercept; enum x86_intercept_stage; +union kvm_smram; struct x86_exception { u8 vector; @@ -236,7 +237,7 @@ struct x86_emulate_ops { unsigned (*get_hflags)(struct x86_emulate_ctxt *ctxt); void (*exiting_smm)(struct x86_emulate_ctxt *ctxt); - int (*leave_smm)(struct x86_emulate_ctxt *ctxt, const char *smstate); + int (*leave_smm)(struct x86_emulate_ctxt *ctxt, const union kvm_smram *smram); void (*triple_fault)(struct x86_emulate_ctxt *ctxt); int (*set_xcr)(struct x86_emulate_ctxt *ctxt, u32 index, u64 xcr); }; diff --git a/arch/x86/kvm/svm/svm.c b/arch/x86/kvm/svm/svm.c index 38f873cb6f2c14..688315d1dfabd1 100644 --- a/arch/x86/kvm/svm/svm.c +++ b/arch/x86/kvm/svm/svm.c @@ -4433,12 +4433,14 @@ static int svm_smi_allowed(struct kvm_vcpu *vcpu, bool for_injection) return 1; } -static int svm_enter_smm(struct kvm_vcpu *vcpu, char *smstate) +static int svm_enter_smm(struct kvm_vcpu *vcpu, union kvm_smram *smram) { struct vcpu_svm *svm = to_svm(vcpu); struct kvm_host_map map_save; int ret; + char *smstate = (char *)smram; + if (!is_guest_mode(vcpu)) return 0; @@ -4480,7 +4482,7 @@ static int svm_enter_smm(struct kvm_vcpu *vcpu, char *smstate) return 0; } -static int svm_leave_smm(struct kvm_vcpu *vcpu, const char *smstate) +static int svm_leave_smm(struct kvm_vcpu *vcpu, const union kvm_smram *smram) { struct vcpu_svm *svm = to_svm(vcpu); struct kvm_host_map map, map_save; @@ -4488,6 +4490,8 @@ static int svm_leave_smm(struct kvm_vcpu *vcpu, const char *smstate) struct vmcb *vmcb12; int ret; + const char *smstate = (const char *)smram; + if (!guest_cpuid_has(vcpu, X86_FEATURE_LM)) return 0; diff --git a/arch/x86/kvm/vmx/vmx.c b/arch/x86/kvm/vmx/vmx.c index d7f8331d6f7e72..fdb7e9280e9150 100644 --- a/arch/x86/kvm/vmx/vmx.c +++ b/arch/x86/kvm/vmx/vmx.c @@ -7919,7 +7919,7 @@ static int vmx_smi_allowed(struct kvm_vcpu *vcpu, bool for_injection) return !is_smm(vcpu); } -static int vmx_enter_smm(struct kvm_vcpu *vcpu, char *smstate) +static int vmx_enter_smm(struct kvm_vcpu *vcpu, union kvm_smram *smram) { struct vcpu_vmx *vmx = to_vmx(vcpu); @@ -7940,7 +7940,7 @@ static int vmx_enter_smm(struct kvm_vcpu *vcpu, char *smstate) return 0; } -static int vmx_leave_smm(struct kvm_vcpu *vcpu, const char *smstate) +static int vmx_leave_smm(struct kvm_vcpu *vcpu, const union kvm_smram *smram) { struct vcpu_vmx *vmx = to_vmx(vcpu); int ret; diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c index bea7e5015d592e..cbbe49bdc58787 100644 --- a/arch/x86/kvm/x86.c +++ b/arch/x86/kvm/x86.c @@ -8054,9 +8054,9 @@ static void emulator_exiting_smm(struct x86_emulate_ctxt *ctxt) } static int emulator_leave_smm(struct x86_emulate_ctxt *ctxt, - const char *smstate) + const union kvm_smram *smram) { - return static_call(kvm_x86_leave_smm)(emul_to_vcpu(ctxt), smstate); + return static_call(kvm_x86_leave_smm)(emul_to_vcpu(ctxt), smram); } static void emulator_triple_fault(struct x86_emulate_ctxt *ctxt) @@ -9979,25 +9979,25 @@ static void enter_smm(struct kvm_vcpu *vcpu) struct kvm_segment cs, ds; struct desc_ptr dt; unsigned long cr0; - char buf[512]; + union kvm_smram smram; - memset(buf, 0, 512); + memset(smram.bytes, 0, sizeof(smram.bytes)); #ifdef CONFIG_X86_64 if (guest_cpuid_has(vcpu, X86_FEATURE_LM)) - enter_smm_save_state_64(vcpu, buf); + enter_smm_save_state_64(vcpu, (char *)&smram); else #endif - enter_smm_save_state_32(vcpu, buf); + enter_smm_save_state_32(vcpu, (char *)&smram); /* * Give enter_smm() a chance to make ISA-specific changes to the vCPU * state (e.g. leave guest mode) after we've saved the state into the * SMM state-save area. */ - static_call(kvm_x86_enter_smm)(vcpu, buf); + static_call(kvm_x86_enter_smm)(vcpu, &smram); kvm_smm_changed(vcpu, true); - kvm_vcpu_write_guest(vcpu, vcpu->arch.smbase + 0xfe00, buf, sizeof(buf)); + kvm_vcpu_write_guest(vcpu, vcpu->arch.smbase + 0xfe00, &smram, sizeof(smram)); if (static_call(kvm_x86_get_nmi_mask)(vcpu)) vcpu->arch.hflags |= HF_SMM_INSIDE_NMI_MASK;