From nobody Mon Oct 6 08:10:09 2025 Received: from mail.zytor.com (terminus.zytor.com [198.137.202.136]) (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 7A69523D288; Wed, 23 Jul 2025 17:54:40 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=198.137.202.136 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1753293282; cv=none; b=TvAXGg01ALTYN7M9HzeOMcdA4ZRBZQj3VCEswUwrSkXjtY4j9/gIFgiL0LegFEZ9GhPFa4hPuqmsLpkznLWOBOdwdJJGrFJRHP1kpdeQFG/NXMu1e8VYstFCtEQ2V0IGB1eVoXF5u7wZNG77YxSwMn9lr5QKjoNU+Jldg1HFJwo= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1753293282; c=relaxed/simple; bh=/gutJcM4arTMByvbZfk3KluI2+D980tBXtJ5GhFHKZ4=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=nKjxDjZgguCCNtRJ5QC27xMF7J62D0miXP+QHrtAKroF4S4mcIprgQfmQnXn2/GyK9k312jT1M5G1Z8vMPRW2KjCj+3cKeVUwgDkRxjMiSSLrj+TKzr+nMlQm04EdjaQ0HWgOcvl0Rk1BfgtuBUvxZ9cuIYRO2IePhPKddZwLHc= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=zytor.com; spf=pass smtp.mailfrom=zytor.com; dkim=pass (2048-bit key) header.d=zytor.com header.i=@zytor.com header.b=mSZK8gnI; arc=none smtp.client-ip=198.137.202.136 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=zytor.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=zytor.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=zytor.com header.i=@zytor.com header.b="mSZK8gnI" Received: from terminus.zytor.com (terminus.zytor.com [IPv6:2607:7c80:54:3:0:0:0:136]) (authenticated bits=0) by mail.zytor.com (8.18.1/8.17.1) with ESMTPSA id 56NHrfxq1284522 (version=TLSv1.3 cipher=TLS_AES_256_GCM_SHA384 bits=256 verify=NO); Wed, 23 Jul 2025 10:53:47 -0700 DKIM-Filter: OpenDKIM Filter v2.11.0 mail.zytor.com 56NHrfxq1284522 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=zytor.com; s=2025072201; t=1753293228; bh=GJkPKHhxeHZQ2rloiYOXgmmG+qEVAmh+lbVKbqnN2ts=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=mSZK8gnIvlS3ck43HMHNXsdBBJaeF7Brl8Coo0nIcMAhMKzJAdWZKp7Pe0b1V/3Ny GvKEUqQ7iNqzE87Lwt0X/B0P76Z3Vv3Hbu3u9oxb2RZmEgPfAMbCZA3laq680WGFIo l3ILhK/iL5/35l9gi8oaPOP1KTm/EKd0f669vgrOPUhsFkfHwfqedWh+9wMlhFykDW ONeV2Dbbhj5rQt8Rvm8rtn67XOvevTXik16IK7blGeBZOpTILfvvHtEJoUIM4pWsVE 6UfUL/za/h/SRVy2Icbk1fZQ9rVSB6TYBaXVpoB3AFPZ3F51MItt7gqr+La/0MLr4C GK9nlxaisOmXw== From: "Xin Li (Intel)" To: linux-kernel@vger.kernel.org, kvm@vger.kernel.org, linux-doc@vger.kernel.org Cc: pbonzini@redhat.com, seanjc@google.com, corbet@lwn.net, tglx@linutronix.de, mingo@redhat.com, bp@alien8.de, dave.hansen@linux.intel.com, x86@kernel.org, hpa@zytor.com, xin@zytor.com, luto@kernel.org, peterz@infradead.org, andrew.cooper3@citrix.com, chao.gao@intel.com, hch@infradead.org Subject: [PATCH v5 02/23] KVM: VMX: Initialize VM entry/exit FRED controls in vmcs_config Date: Wed, 23 Jul 2025 10:53:20 -0700 Message-ID: <20250723175341.1284463-3-xin@zytor.com> X-Mailer: git-send-email 2.50.1 In-Reply-To: <20250723175341.1284463-1-xin@zytor.com> References: <20250723175341.1284463-1-xin@zytor.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" From: Xin Li Setup VM entry/exit FRED controls in the global vmcs_config for proper FRED VMCS fields management: 1) load guest FRED state upon VM entry. 2) save guest FRED state during VM exit. 3) load host FRED state during VM exit. Also add FRED control consistency checks to the existing VM entry/exit consistency check framework. Signed-off-by: Xin Li Signed-off-by: Xin Li (Intel) Tested-by: Shan Kang Tested-by: Xuelian Guo Reviewed-by: Chao Gao --- Change in v5: * Remove the pair VM_ENTRY_LOAD_IA32_FRED/VM_EXIT_ACTIVATE_SECONDARY_CONTRO= LS, since the secondary VM exit controls are unconditionally enabled anyway, = and there are features other than FRED needing it (Chao Gao). * Add TB from Xuelian Guo. Change in v4: * Do VM exit/entry consistency checks using the new macro from Sean Christopherson. Changes in v3: * Add FRED control consistency checks to the existing VM entry/exit consistency check framework (Sean Christopherson). * Just do the unnecessary FRED state load/store on every VM entry/exit (Sean Christopherson). --- arch/x86/include/asm/vmx.h | 4 ++++ arch/x86/kvm/vmx/vmx.c | 2 ++ arch/x86/kvm/vmx/vmx.h | 7 +++++-- 3 files changed, 11 insertions(+), 2 deletions(-) diff --git a/arch/x86/include/asm/vmx.h b/arch/x86/include/asm/vmx.h index 97f7e0545534..1879de94457d 100644 --- a/arch/x86/include/asm/vmx.h +++ b/arch/x86/include/asm/vmx.h @@ -108,6 +108,9 @@ #define VM_EXIT_CLEAR_IA32_RTIT_CTL 0x02000000 #define VM_EXIT_ACTIVATE_SECONDARY_CONTROLS 0x80000000 =20 +#define SECONDARY_VM_EXIT_SAVE_IA32_FRED BIT_ULL(0) +#define SECONDARY_VM_EXIT_LOAD_IA32_FRED BIT_ULL(1) + #define VM_EXIT_ALWAYSON_WITHOUT_TRUE_MSR 0x00036dff =20 #define VM_ENTRY_LOAD_DEBUG_CONTROLS 0x00000004 @@ -120,6 +123,7 @@ #define VM_ENTRY_LOAD_BNDCFGS 0x00010000 #define VM_ENTRY_PT_CONCEAL_PIP 0x00020000 #define VM_ENTRY_LOAD_IA32_RTIT_CTL 0x00040000 +#define VM_ENTRY_LOAD_IA32_FRED 0x00800000 =20 #define VM_ENTRY_ALWAYSON_WITHOUT_TRUE_MSR 0x000011ff =20 diff --git a/arch/x86/kvm/vmx/vmx.c b/arch/x86/kvm/vmx/vmx.c index 85632de1dddb..463fc4a65788 100644 --- a/arch/x86/kvm/vmx/vmx.c +++ b/arch/x86/kvm/vmx/vmx.c @@ -2591,6 +2591,8 @@ static int setup_vmcs_config(struct vmcs_config *vmcs= _conf, u32 entry_control; u64 exit_control; } const vmcs_entry_exit2_pairs[] =3D { + { VM_ENTRY_LOAD_IA32_FRED, + SECONDARY_VM_EXIT_SAVE_IA32_FRED | SECONDARY_VM_EXIT_LOAD_IA32_FRED }, }; =20 memset(vmcs_conf, 0, sizeof(*vmcs_conf)); diff --git a/arch/x86/kvm/vmx/vmx.h b/arch/x86/kvm/vmx/vmx.h index 20194412bed3..32829f98af2f 100644 --- a/arch/x86/kvm/vmx/vmx.h +++ b/arch/x86/kvm/vmx/vmx.h @@ -484,7 +484,8 @@ static inline u8 vmx_get_rvi(void) VM_ENTRY_LOAD_IA32_EFER | \ VM_ENTRY_LOAD_BNDCFGS | \ VM_ENTRY_PT_CONCEAL_PIP | \ - VM_ENTRY_LOAD_IA32_RTIT_CTL) + VM_ENTRY_LOAD_IA32_RTIT_CTL | \ + VM_ENTRY_LOAD_IA32_FRED) =20 #define __KVM_REQUIRED_VMX_VM_EXIT_CONTROLS \ (VM_EXIT_SAVE_DEBUG_CONTROLS | \ @@ -510,7 +511,9 @@ static inline u8 vmx_get_rvi(void) VM_EXIT_ACTIVATE_SECONDARY_CONTROLS) =20 #define KVM_REQUIRED_VMX_SECONDARY_VM_EXIT_CONTROLS (0) -#define KVM_OPTIONAL_VMX_SECONDARY_VM_EXIT_CONTROLS (0) +#define KVM_OPTIONAL_VMX_SECONDARY_VM_EXIT_CONTROLS \ + (SECONDARY_VM_EXIT_SAVE_IA32_FRED | \ + SECONDARY_VM_EXIT_LOAD_IA32_FRED) =20 #define KVM_REQUIRED_VMX_PIN_BASED_VM_EXEC_CONTROL \ (PIN_BASED_EXT_INTR_MASK | \ --=20 2.50.1