linux-kernel - [PATCH v2 25/28] KVM: VMX: Store required-1 VMX controls in vmcs

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Date:   Wed, 29 Jun 2022 17:06:22 +0200
From:   Vitaly Kuznetsov <vkuznets@...hat.com>
To:     kvm@...r.kernel.org, Paolo Bonzini <pbonzini@...hat.com>,
        Sean Christopherson <seanjc@...gle.com>
Cc:     Anirudh Rayabharam <anrayabh@...ux.microsoft.com>,
        Wanpeng Li <wanpengli@...cent.com>,
        Jim Mattson <jmattson@...gle.com>,
        Maxim Levitsky <mlevitsk@...hat.com>,
        linux-hyperv@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH v2 25/28] KVM: VMX: Store required-1 VMX controls in vmcs_config

While constructing nested VMX MSRs values, nested_vmx_setup_ctls_msrs()
has to re-read host VMX control MSRs to get required-1 bits which are not
stored anywhre. Add this missing information to vmcs_config.

No functional change intended.

Signed-off-by: Vitaly Kuznetsov <vkuznets@...hat.com>
---
 arch/x86/kvm/vmx/capabilities.h |  5 +++++
 arch/x86/kvm/vmx/vmx.c          | 28 +++++++++++++++++++++-------
 2 files changed, 26 insertions(+), 7 deletions(-)

diff --git a/arch/x86/kvm/vmx/capabilities.h b/arch/x86/kvm/vmx/capabilities.h
index 069d8d298e1d..2e223440e7ed 100644
--- a/arch/x86/kvm/vmx/capabilities.h
+++ b/arch/x86/kvm/vmx/capabilities.h
@@ -60,11 +60,16 @@ struct vmcs_config {
 	u32 basic_cap;
 	u32 revision_id;
 	u32 pin_based_exec_ctrl;
+	u32 pin_based_exec_ctrl_req1;
 	u32 cpu_based_exec_ctrl;
+	u32 cpu_based_exec_ctrl_req1;
 	u32 cpu_based_2nd_exec_ctrl;
+	u32 cpu_based_2nd_exec_ctrl_req1;
 	u64 cpu_based_3rd_exec_ctrl;
 	u32 vmexit_ctrl;
+	u32 vmexit_ctrl_req1;
 	u32 vmentry_ctrl;
+	u32 vmentry_ctrl_req1;
 	struct nested_vmx_msrs nested;
 };
 extern struct vmcs_config vmcs_config;
diff --git a/arch/x86/kvm/vmx/vmx.c b/arch/x86/kvm/vmx/vmx.c
index 5d4158b7421c..c195c159738d 100644
--- a/arch/x86/kvm/vmx/vmx.c
+++ b/arch/x86/kvm/vmx/vmx.c
@@ -2442,7 +2442,7 @@ static bool cpu_has_perf_global_ctrl_bug(void)
 
 
 static __init int adjust_vmx_controls(u32 ctl_min, u32 ctl_opt,
-				      u32 msr, u32 *result)
+				      u32 msr, u32 *result_high, u32 *result_low)
 {
 	u32 vmx_msr_low, vmx_msr_high;
 	u32 ctl = ctl_min | ctl_opt;
@@ -2456,7 +2456,8 @@ static __init int adjust_vmx_controls(u32 ctl_min, u32 ctl_opt,
 	if (ctl_min & ~ctl)
 		return -EIO;
 
-	*result = ctl;
+	*result_high = ctl;
+	*result_low = vmx_msr_low;
 	return 0;
 }
 
@@ -2479,6 +2480,11 @@ static __init int setup_vmcs_config(struct vmcs_config *vmcs_conf,
 	u64 _cpu_based_3rd_exec_control = 0;
 	u32 _vmexit_control = 0;
 	u32 _vmentry_control = 0;
+	u32 _pin_based_exec_control_low = 0;
+	u32 _cpu_based_exec_control_low = 0;
+	u32 _cpu_based_2nd_exec_control_low = 0;
+	u32 _vmexit_control_low = 0;
+	u32 _vmentry_control_low = 0;
 	int i;
 
 	/*
@@ -2502,13 +2508,15 @@ static __init int setup_vmcs_config(struct vmcs_config *vmcs_conf,
 	if (adjust_vmx_controls(KVM_REQ_VMX_CPU_BASED_VM_EXEC_CONTROL,
 				KVM_OPT_VMX_CPU_BASED_VM_EXEC_CONTROL,
 				MSR_IA32_VMX_PROCBASED_CTLS,
-				&_cpu_based_exec_control) < 0)
+				&_cpu_based_exec_control,
+				&_cpu_based_exec_control_low) < 0)
 		return -EIO;
 	if (_cpu_based_exec_control & CPU_BASED_ACTIVATE_SECONDARY_CONTROLS) {
 		if (adjust_vmx_controls(KVM_REQ_VMX_SECONDARY_VM_EXEC_CONTROL,
 					KVM_OPT_VMX_SECONDARY_VM_EXEC_CONTROL,
 					MSR_IA32_VMX_PROCBASED_CTLS2,
-					&_cpu_based_2nd_exec_control) < 0)
+					&_cpu_based_2nd_exec_control,
+					&_cpu_based_2nd_exec_control_low) < 0)
 			return -EIO;
 	}
 #ifndef CONFIG_X86_64
@@ -2559,13 +2567,14 @@ static __init int setup_vmcs_config(struct vmcs_config *vmcs_conf,
 	if (adjust_vmx_controls(KVM_REQ_VMX_VM_EXIT_CONTROLS,
 				KVM_OPT_VMX_VM_EXIT_CONTROLS,
 				MSR_IA32_VMX_EXIT_CTLS,
-				&_vmexit_control) < 0)
+				&_vmexit_control, &_vmexit_control_low) < 0)
 		return -EIO;
 
 	if (adjust_vmx_controls(KVM_REQ_VMX_PIN_BASED_VM_EXEC_CONTROL,
 				KVM_OPT_VMX_PIN_BASED_VM_EXEC_CONTROL,
 				MSR_IA32_VMX_PINBASED_CTLS,
-				&_pin_based_exec_control) < 0)
+				&_pin_based_exec_control,
+				&_pin_based_exec_control_low) < 0)
 		return -EIO;
 
 	if (cpu_has_broken_vmx_preemption_timer())
@@ -2577,7 +2586,7 @@ static __init int setup_vmcs_config(struct vmcs_config *vmcs_conf,
 	if (adjust_vmx_controls(KVM_REQ_VMX_VM_ENTRY_CONTROLS,
 				KVM_OPT_VMX_VM_ENTRY_CONTROLS,
 				MSR_IA32_VMX_ENTRY_CTLS,
-				&_vmentry_control) < 0)
+				&_vmentry_control, &_vmentry_control_low) < 0)
 		return -EIO;
 
 	for (i = 0; i < ARRAY_SIZE(vmcs_entry_exit_pairs); i++) {
@@ -2619,11 +2628,16 @@ static __init int setup_vmcs_config(struct vmcs_config *vmcs_conf,
 	vmcs_conf->revision_id = vmx_msr_low;
 
 	vmcs_conf->pin_based_exec_ctrl = _pin_based_exec_control;
+	vmcs_conf->pin_based_exec_ctrl_req1 = _pin_based_exec_control_low;
 	vmcs_conf->cpu_based_exec_ctrl = _cpu_based_exec_control;
+	vmcs_conf->cpu_based_exec_ctrl_req1 = _cpu_based_exec_control_low;
 	vmcs_conf->cpu_based_2nd_exec_ctrl = _cpu_based_2nd_exec_control;
+	vmcs_conf->cpu_based_2nd_exec_ctrl_req1 = _cpu_based_2nd_exec_control_low;
 	vmcs_conf->cpu_based_3rd_exec_ctrl = _cpu_based_3rd_exec_control;
 	vmcs_conf->vmexit_ctrl         = _vmexit_control;
+	vmcs_conf->vmexit_ctrl_req1         = _vmexit_control_low;
 	vmcs_conf->vmentry_ctrl        = _vmentry_control;
+	vmcs_conf->vmentry_ctrl_req1        = _vmentry_control_low;
 
 	return 0;
 }
-- 
2.35.3