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 CF72CC433EF for ; Wed, 20 Jul 2022 01:13:49 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S240882AbiGTBNs (ORCPT ); Tue, 19 Jul 2022 21:13:48 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:33234 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S240847AbiGTBNV (ORCPT ); Tue, 19 Jul 2022 21:13:21 -0400 Received: from dfw.source.kernel.org (dfw.source.kernel.org [139.178.84.217]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 4101065D79; Tue, 19 Jul 2022 18:12:27 -0700 (PDT) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by dfw.source.kernel.org (Postfix) with ESMTPS id C43A261729; Wed, 20 Jul 2022 01:12:26 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id CD2F3C341CA; Wed, 20 Jul 2022 01:12:24 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1658279546; bh=5dmXdSTqQQBWXAc0XvVtaF6Pu2EXBPQ6z9XzsNc1Ojg=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=h95gDXSccD3M1nUHO6Ii8b2Whtaz80FXwezZFFH3tV1lh+8iVHVSWLXoSF5e7O9VS dcSm1ehF2kxfbESbnwmCSQlgMjGPBH4/4BQ9r18lOdH5Zm2BlIZhjyltLDBNfWaM9e pAvE/9uFs3xEZICDxo9LkEJtETl4J4E592DKeDM42YPUeeVILy1fMeUUNAxnnJTB6D XfZSo1RpJLCAU8qYDwwcNDocJJu886Urk0GfDtPZ2MjMLFt2IqWuh93RzwQFE8wh3j YFRmRpMKV8Y63uZVl3YPvwgJLoH9ALGoa1iSvlpsTRZE8xIN5EaAJELzFBPY8358fw eOJmlol2wgnCA== From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Josh Poimboeuf , Peter Zijlstra , Borislav Petkov , Sasha Levin , seanjc@google.com, pbonzini@redhat.com, tglx@linutronix.de, mingo@redhat.com, bp@alien8.de, dave.hansen@linux.intel.com, x86@kernel.org, kvm@vger.kernel.org Subject: [PATCH AUTOSEL 5.18 26/54] KVM: VMX: Convert launched argument to flags Date: Tue, 19 Jul 2022 21:10:03 -0400 Message-Id: <20220720011031.1023305-26-sashal@kernel.org> X-Mailer: git-send-email 2.35.1 In-Reply-To: <20220720011031.1023305-1-sashal@kernel.org> References: <20220720011031.1023305-1-sashal@kernel.org> MIME-Version: 1.0 X-stable: review X-Patchwork-Hint: Ignore Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Josh Poimboeuf [ Upstream commit bb06650634d3552c0f8557e9d16aa1a408040e28 ] Convert __vmx_vcpu_run()'s 'launched' argument to 'flags', in preparation for doing SPEC_CTRL handling immediately after vmexit, which will need another flag. This is much easier than adding a fourth argument, because this code supports both 32-bit and 64-bit, and the fourth argument on 32-bit would have to be pushed on the stack. Note that __vmx_vcpu_run_flags() is called outside of the noinstr critical section because it will soon start calling potentially traceable functions. Signed-off-by: Josh Poimboeuf Signed-off-by: Peter Zijlstra (Intel) Signed-off-by: Borislav Petkov Signed-off-by: Sasha Levin --- arch/x86/kvm/vmx/nested.c | 2 +- arch/x86/kvm/vmx/run_flags.h | 7 +++++++ arch/x86/kvm/vmx/vmenter.S | 9 +++++---- arch/x86/kvm/vmx/vmx.c | 17 ++++++++++++++--- arch/x86/kvm/vmx/vmx.h | 5 ++++- 5 files changed, 31 insertions(+), 9 deletions(-) create mode 100644 arch/x86/kvm/vmx/run_flags.h diff --git a/arch/x86/kvm/vmx/nested.c b/arch/x86/kvm/vmx/nested.c index ee7df31883cd..28ccf25c4124 100644 --- a/arch/x86/kvm/vmx/nested.c +++ b/arch/x86/kvm/vmx/nested.c @@ -3091,7 +3091,7 @@ static int nested_vmx_check_vmentry_hw(struct kvm_vcpu *vcpu) } vm_fail = __vmx_vcpu_run(vmx, (unsigned long *)&vcpu->arch.regs, - vmx->loaded_vmcs->launched); + __vmx_vcpu_run_flags(vmx)); if (vmx->msr_autoload.host.nr) vmcs_write32(VM_EXIT_MSR_LOAD_COUNT, vmx->msr_autoload.host.nr); diff --git a/arch/x86/kvm/vmx/run_flags.h b/arch/x86/kvm/vmx/run_flags.h new file mode 100644 index 000000000000..57f4c664ea9c --- /dev/null +++ b/arch/x86/kvm/vmx/run_flags.h @@ -0,0 +1,7 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +#ifndef __KVM_X86_VMX_RUN_FLAGS_H +#define __KVM_X86_VMX_RUN_FLAGS_H + +#define VMX_RUN_VMRESUME (1 << 0) + +#endif /* __KVM_X86_VMX_RUN_FLAGS_H */ diff --git a/arch/x86/kvm/vmx/vmenter.S b/arch/x86/kvm/vmx/vmenter.S index c83163fb2e9c..ddc3bf85db33 100644 --- a/arch/x86/kvm/vmx/vmenter.S +++ b/arch/x86/kvm/vmx/vmenter.S @@ -5,6 +5,7 @@ #include #include #include +#include "run_flags.h" #define WORD_SIZE (BITS_PER_LONG / 8) @@ -34,7 +35,7 @@ * __vmx_vcpu_run - Run a vCPU via a transition to VMX guest mode * @vmx: struct vcpu_vmx * (forwarded to vmx_update_host_rsp) * @regs: unsigned long * (to guest registers) - * @launched: %true if the VMCS has been launched + * @flags: VMX_RUN_VMRESUME: use VMRESUME instead of VMLAUNCH * * Returns: * 0 on VM-Exit, 1 on VM-Fail @@ -59,7 +60,7 @@ SYM_FUNC_START(__vmx_vcpu_run) */ push %_ASM_ARG2 - /* Copy @launched to BL, _ASM_ARG3 is volatile. */ + /* Copy @flags to BL, _ASM_ARG3 is volatile. */ mov %_ASM_ARG3B, %bl lea (%_ASM_SP), %_ASM_ARG2 @@ -69,7 +70,7 @@ SYM_FUNC_START(__vmx_vcpu_run) mov (%_ASM_SP), %_ASM_AX /* Check if vmlaunch or vmresume is needed */ - testb %bl, %bl + testb $VMX_RUN_VMRESUME, %bl /* Load guest registers. Don't clobber flags. */ mov VCPU_RCX(%_ASM_AX), %_ASM_CX @@ -92,7 +93,7 @@ SYM_FUNC_START(__vmx_vcpu_run) mov VCPU_RAX(%_ASM_AX), %_ASM_AX /* Check EFLAGS.ZF from 'testb' above */ - je .Lvmlaunch + jz .Lvmlaunch /* * After a successful VMRESUME/VMLAUNCH, control flow "magically" diff --git a/arch/x86/kvm/vmx/vmx.c b/arch/x86/kvm/vmx/vmx.c index da103938e62e..a961e276273b 100644 --- a/arch/x86/kvm/vmx/vmx.c +++ b/arch/x86/kvm/vmx/vmx.c @@ -839,6 +839,16 @@ static bool msr_write_intercepted(struct vcpu_vmx *vmx, u32 msr) MSR_IA32_SPEC_CTRL); } +unsigned int __vmx_vcpu_run_flags(struct vcpu_vmx *vmx) +{ + unsigned int flags = 0; + + if (vmx->loaded_vmcs->launched) + flags |= VMX_RUN_VMRESUME; + + return flags; +} + static void clear_atomic_switch_msr_special(struct vcpu_vmx *vmx, unsigned long entry, unsigned long exit) { @@ -6827,7 +6837,8 @@ static fastpath_t vmx_exit_handlers_fastpath(struct kvm_vcpu *vcpu) } static noinstr void vmx_vcpu_enter_exit(struct kvm_vcpu *vcpu, - struct vcpu_vmx *vmx) + struct vcpu_vmx *vmx, + unsigned long flags) { guest_state_enter_irqoff(); @@ -6846,7 +6857,7 @@ static noinstr void vmx_vcpu_enter_exit(struct kvm_vcpu *vcpu, native_write_cr2(vcpu->arch.cr2); vmx->fail = __vmx_vcpu_run(vmx, (unsigned long *)&vcpu->arch.regs, - vmx->loaded_vmcs->launched); + flags); vcpu->arch.cr2 = native_read_cr2(); @@ -6954,7 +6965,7 @@ static fastpath_t vmx_vcpu_run(struct kvm_vcpu *vcpu) x86_spec_ctrl_set_guest(vmx->spec_ctrl, 0); /* The actual VMENTER/EXIT is in the .noinstr.text section. */ - vmx_vcpu_enter_exit(vcpu, vmx); + vmx_vcpu_enter_exit(vcpu, vmx, __vmx_vcpu_run_flags(vmx)); /* * We do not use IBRS in the kernel. If this vCPU has used the diff --git a/arch/x86/kvm/vmx/vmx.h b/arch/x86/kvm/vmx/vmx.h index 8d2342ede0c5..1b1982448aa4 100644 --- a/arch/x86/kvm/vmx/vmx.h +++ b/arch/x86/kvm/vmx/vmx.h @@ -13,6 +13,7 @@ #include "vmcs.h" #include "vmx_ops.h" #include "cpuid.h" +#include "run_flags.h" #define MSR_TYPE_R 1 #define MSR_TYPE_W 2 @@ -404,7 +405,9 @@ void vmx_set_virtual_apic_mode(struct kvm_vcpu *vcpu); struct vmx_uret_msr *vmx_find_uret_msr(struct vcpu_vmx *vmx, u32 msr); void pt_update_intercept_for_msr(struct kvm_vcpu *vcpu); void vmx_update_host_rsp(struct vcpu_vmx *vmx, unsigned long host_rsp); -bool __vmx_vcpu_run(struct vcpu_vmx *vmx, unsigned long *regs, bool launched); +unsigned int __vmx_vcpu_run_flags(struct vcpu_vmx *vmx); +bool __vmx_vcpu_run(struct vcpu_vmx *vmx, unsigned long *regs, + unsigned int flags); int vmx_find_loadstore_msr_slot(struct vmx_msrs *m, u32 msr); void vmx_ept_load_pdptrs(struct kvm_vcpu *vcpu); -- 2.35.1