From patchwork Fri Sep 27 21:45:23 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Sean Christopherson X-Patchwork-Id: 11165171 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 27A951709 for ; Fri, 27 Sep 2019 21:45:40 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 0ED8C2146E for ; Fri, 27 Sep 2019 21:45:40 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728604AbfI0Vp3 (ORCPT ); Fri, 27 Sep 2019 17:45:29 -0400 Received: from mga12.intel.com ([192.55.52.136]:45957 "EHLO mga12.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728559AbfI0Vp3 (ORCPT ); Fri, 27 Sep 2019 17:45:29 -0400 X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from fmsmga003.fm.intel.com ([10.253.24.29]) by fmsmga106.fm.intel.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 27 Sep 2019 14:45:27 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.64,557,1559545200"; d="scan'208";a="196852082" Received: from sjchrist-coffee.jf.intel.com ([10.54.74.41]) by FMSMGA003.fm.intel.com with ESMTP; 27 Sep 2019 14:45:27 -0700 From: Sean Christopherson To: Paolo Bonzini , =?utf-8?b?UmFkaW0gS3LEjW3DocWZ?= Cc: Sean Christopherson , Vitaly Kuznetsov , Wanpeng Li , Jim Mattson , Joerg Roedel , kvm@vger.kernel.org, linux-kernel@vger.kernel.org, Reto Buerki , Liran Alon Subject: [PATCH v2 8/8] KVM: x86: Fold decache_cr3() into cache_reg() Date: Fri, 27 Sep 2019 14:45:23 -0700 Message-Id: <20190927214523.3376-9-sean.j.christopherson@intel.com> X-Mailer: git-send-email 2.22.0 In-Reply-To: <20190927214523.3376-1-sean.j.christopherson@intel.com> References: <20190927214523.3376-1-sean.j.christopherson@intel.com> MIME-Version: 1.0 Sender: kvm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org Handle caching CR3 (from VMX's VMCS) into struct kvm_vcpu via the common cache_reg() callback and drop the dedicated decache_cr3(). The name decache_cr3() is somewhat confusing as the caching behavior of CR3 follows that of GPRs, RFLAGS and PDPTRs, (handled via cache_reg()), and has nothing in common with the caching behavior of CR0/CR4 (whose decache_cr{0,4}_guest_bits() likely provided the 'decache' verbiage). Note, this effectively adds a BUG() if KVM attempts to cache CR3 on SVM. Opportunistically add a WARN_ON_ONCE() in VMX to provide an equivalent check. Signed-off-by: Sean Christopherson --- arch/x86/include/asm/kvm_host.h | 1 - arch/x86/kvm/kvm_cache_regs.h | 2 +- arch/x86/kvm/svm.c | 5 ----- arch/x86/kvm/vmx/vmx.c | 15 ++++++--------- 4 files changed, 7 insertions(+), 16 deletions(-) diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_host.h index a27f7f6b6b7a..0411dc0a27b0 100644 --- a/arch/x86/include/asm/kvm_host.h +++ b/arch/x86/include/asm/kvm_host.h @@ -1040,7 +1040,6 @@ struct kvm_x86_ops { struct kvm_segment *var, int seg); void (*get_cs_db_l_bits)(struct kvm_vcpu *vcpu, int *db, int *l); void (*decache_cr0_guest_bits)(struct kvm_vcpu *vcpu); - void (*decache_cr3)(struct kvm_vcpu *vcpu); void (*decache_cr4_guest_bits)(struct kvm_vcpu *vcpu); void (*set_cr0)(struct kvm_vcpu *vcpu, unsigned long cr0); void (*set_cr3)(struct kvm_vcpu *vcpu, unsigned long cr3); diff --git a/arch/x86/kvm/kvm_cache_regs.h b/arch/x86/kvm/kvm_cache_regs.h index 9c2bc528800b..f18177cd0030 100644 --- a/arch/x86/kvm/kvm_cache_regs.h +++ b/arch/x86/kvm/kvm_cache_regs.h @@ -145,7 +145,7 @@ static inline ulong kvm_read_cr4_bits(struct kvm_vcpu *vcpu, ulong mask) static inline ulong kvm_read_cr3(struct kvm_vcpu *vcpu) { if (!kvm_register_is_available(vcpu, VCPU_EXREG_CR3)) - kvm_x86_ops->decache_cr3(vcpu); + kvm_x86_ops->cache_reg(vcpu, VCPU_EXREG_CR3); return vcpu->arch.cr3; } diff --git a/arch/x86/kvm/svm.c b/arch/x86/kvm/svm.c index f8ecb6df5106..3102c44c12c6 100644 --- a/arch/x86/kvm/svm.c +++ b/arch/x86/kvm/svm.c @@ -2517,10 +2517,6 @@ static void svm_decache_cr0_guest_bits(struct kvm_vcpu *vcpu) { } -static void svm_decache_cr3(struct kvm_vcpu *vcpu) -{ -} - static void svm_decache_cr4_guest_bits(struct kvm_vcpu *vcpu) { } @@ -7208,7 +7204,6 @@ static struct kvm_x86_ops svm_x86_ops __ro_after_init = { .get_cpl = svm_get_cpl, .get_cs_db_l_bits = kvm_get_cs_db_l_bits, .decache_cr0_guest_bits = svm_decache_cr0_guest_bits, - .decache_cr3 = svm_decache_cr3, .decache_cr4_guest_bits = svm_decache_cr4_guest_bits, .set_cr0 = svm_set_cr0, .set_cr3 = svm_set_cr3, diff --git a/arch/x86/kvm/vmx/vmx.c b/arch/x86/kvm/vmx/vmx.c index ed03d0cd1cc8..c84798026e85 100644 --- a/arch/x86/kvm/vmx/vmx.c +++ b/arch/x86/kvm/vmx/vmx.c @@ -2188,7 +2188,12 @@ static void vmx_cache_reg(struct kvm_vcpu *vcpu, enum kvm_reg reg) if (enable_ept) ept_save_pdptrs(vcpu); break; + case VCPU_EXREG_CR3: + if (enable_unrestricted_guest || (enable_ept && is_paging(vcpu))) + vcpu->arch.cr3 = vmcs_readl(GUEST_CR3); + break; default: + WARN_ON_ONCE(1); break; } } @@ -2859,13 +2864,6 @@ static void vmx_decache_cr0_guest_bits(struct kvm_vcpu *vcpu) vcpu->arch.cr0 |= vmcs_readl(GUEST_CR0) & cr0_guest_owned_bits; } -static void vmx_decache_cr3(struct kvm_vcpu *vcpu) -{ - if (enable_unrestricted_guest || (enable_ept && is_paging(vcpu))) - vcpu->arch.cr3 = vmcs_readl(GUEST_CR3); - kvm_register_mark_available(vcpu, VCPU_EXREG_CR3); -} - static void vmx_decache_cr4_guest_bits(struct kvm_vcpu *vcpu) { ulong cr4_guest_owned_bits = vcpu->arch.cr4_guest_owned_bits; @@ -2910,7 +2908,7 @@ static void ept_update_paging_mode_cr0(unsigned long *hw_cr0, struct vcpu_vmx *vmx = to_vmx(vcpu); if (!kvm_register_is_available(vcpu, VCPU_EXREG_CR3)) - vmx_decache_cr3(vcpu); + vmx_cache_reg(vcpu, VCPU_EXREG_CR3); if (!(cr0 & X86_CR0_PG)) { /* From paging/starting to nonpaging */ exec_controls_setbit(vmx, CPU_BASED_CR3_LOAD_EXITING | @@ -7792,7 +7790,6 @@ static struct kvm_x86_ops vmx_x86_ops __ro_after_init = { .get_cpl = vmx_get_cpl, .get_cs_db_l_bits = vmx_get_cs_db_l_bits, .decache_cr0_guest_bits = vmx_decache_cr0_guest_bits, - .decache_cr3 = vmx_decache_cr3, .decache_cr4_guest_bits = vmx_decache_cr4_guest_bits, .set_cr0 = vmx_set_cr0, .set_cr3 = vmx_set_cr3,