[PATCH v1 15/23] KVM: nVMX: Add support for the secondary VM exit controls

Xin Li
2023-11-08T19:00:31Z

Enable the secondary VM exit controls to prepare for nested FRED.

Tested-by: Shan Kang <shan.kang@intel.com>
Signed-off-by: Xin Li <xin3.li@intel.com>
---
Documentation/virt/kvm/x86/nested-vmx.rst | 1 +
arch/x86/include/asm/hyperv-tlfs.h | 1 +
arch/x86/kvm/vmx/capabilities.h | 1 +
arch/x86/kvm/vmx/hyperv.c | 18 +++++++++++++++++-
arch/x86/kvm/vmx/nested.c | 18 +++++++++++++++++-
arch/x86/kvm/vmx/vmcs12.c | 1 +
arch/x86/kvm/vmx/vmcs12.h | 2 ++
arch/x86/kvm/x86.h | 2 +-
8 files changed, 41 insertions(+), 3 deletions(-)

diff --git a/Documentation/virt/kvm/x86/nested-vmx.rst b/Documentation/virt/kvm/x86/nested-vmx.rst
index ac2095d41f02..e64ef231f310 100644
--- a/Documentation/virt/kvm/x86/nested-vmx.rst
+++ b/Documentation/virt/kvm/x86/nested-vmx.rst
@@ -217,6 +217,7 @@ struct shadow_vmcs is ever changed.
u16 host_fs_selector;
u16 host_gs_selector;
u16 host_tr_selector;
+ u64 secondary_vm_exit_controls;
};

diff --git a/arch/x86/include/asm/hyperv-tlfs.h b/arch/x86/include/asm/hyperv-tlfs.h
index 2ff26f53cd62..299554708e37 100644
--- a/arch/x86/include/asm/hyperv-tlfs.h
+++ b/arch/x86/include/asm/hyperv-tlfs.h
@@ -616,6 +616,7 @@ struct hv_enlightened_vmcs {
u64 host_ssp;
u64 host_ia32_int_ssp_table_addr;
u64 padding64_6;
+ u64 secondary_vm_exit_controls;
} __packed;

#define HV_VMX_ENLIGHTENED_CLEAN_FIELD_NONE 0
diff --git a/arch/x86/kvm/vmx/capabilities.h b/arch/x86/kvm/vmx/capabilities.h
index e8f3ad0f79ee..caf38a54856c 100644
--- a/arch/x86/kvm/vmx/capabilities.h
+++ b/arch/x86/kvm/vmx/capabilities.h
@@ -38,6 +38,7 @@ struct nested_vmx_msrs {
u32 pinbased_ctls_high;
u32 exit_ctls_low;
u32 exit_ctls_high;
+ u64 secondary_exit_ctls;
u32 entry_ctls_low;
u32 entry_ctls_high;
u32 misc_low;
diff --git a/arch/x86/kvm/vmx/hyperv.c b/arch/x86/kvm/vmx/hyperv.c
index 313b8bb5b8a7..b8cd53601a00 100644
--- a/arch/x86/kvm/vmx/hyperv.c
+++ b/arch/x86/kvm/vmx/hyperv.c
@@ -103,7 +103,10 @@
VM_EXIT_LOAD_IA32_EFER | \
VM_EXIT_CLEAR_BNDCFGS | \
VM_EXIT_PT_CONCEAL_PIP | \
- VM_EXIT_CLEAR_IA32_RTIT_CTL)
+ VM_EXIT_CLEAR_IA32_RTIT_CTL | \
+ VM_EXIT_ACTIVATE_SECONDARY_CONTROLS)
+
+#define EVMCS1_SUPPORTED_VMEXIT_CTRL2 (0ULL)

#define EVMCS1_SUPPORTED_VMENTRY_CTRL \
(VM_ENTRY_ALWAYSON_WITHOUT_TRUE_MSR | \
@@ -315,6 +318,8 @@ const struct evmcs_field vmcs_field_to_evmcs_1[] = {
HV_VMX_ENLIGHTENED_CLEAN_FIELD_CONTROL_GRP1),
EVMCS1_FIELD(VM_EXIT_CONTROLS, vm_exit_controls,
HV_VMX_ENLIGHTENED_CLEAN_FIELD_CONTROL_GRP1),
+ EVMCS1_FIELD(SECONDARY_VM_EXIT_CONTROLS, secondary_vm_exit_controls,
+ HV_VMX_ENLIGHTENED_CLEAN_FIELD_CONTROL_GRP1),
EVMCS1_FIELD(SECONDARY_VM_EXEC_CONTROL, secondary_vm_exec_control,
HV_VMX_ENLIGHTENED_CLEAN_FIELD_CONTROL_GRP1),
EVMCS1_FIELD(GUEST_ES_LIMIT, guest_es_limit,
@@ -464,6 +469,7 @@ enum evmcs_revision {

enum evmcs_ctrl_type {
EVMCS_EXIT_CTRLS,
+ EVMCS_2NDEXIT,
EVMCS_ENTRY_CTRLS,
EVMCS_EXEC_CTRL,
EVMCS_2NDEXEC,
@@ -477,6 +483,9 @@ static const u32 evmcs_supported_ctrls[NR_EVMCS_CTRLS][NR_EVMCS_REVISIONS] = {
[EVMCS_EXIT_CTRLS] = {
[EVMCSv1_LEGACY] = EVMCS1_SUPPORTED_VMEXIT_CTRL,
},
+ [EVMCS_2NDEXIT] = {
+ [EVMCSv1_LEGACY] = EVMCS1_SUPPORTED_VMEXIT_CTRL2,
+ },
[EVMCS_ENTRY_CTRLS] = {
[EVMCSv1_LEGACY] = EVMCS1_SUPPORTED_VMENTRY_CTRL,
},
@@ -539,6 +548,9 @@ void nested_evmcs_filter_control_msr(struct kvm_vcpu *vcpu, u32 msr_index, u64 *
supported_ctrls &= ~VM_EXIT_LOAD_IA32_PERF_GLOBAL_CTRL;
ctl_high &= supported_ctrls;
break;
+ case MSR_IA32_VMX_EXIT_CTLS2:
+ ctl_low &= evmcs_get_supported_ctls(EVMCS_2NDEXIT);
+ break;
case MSR_IA32_VMX_ENTRY_CTLS:
case MSR_IA32_VMX_TRUE_ENTRY_CTLS:
supported_ctrls = evmcs_get_supported_ctls(EVMCS_ENTRY_CTRLS);
@@ -589,6 +601,10 @@ int nested_evmcs_check_controls(struct vmcs12 *vmcs12)
vmcs12->vm_exit_controls)))
return -EINVAL;

+ if (CC(!nested_evmcs_is_valid_controls(EVMCS_2NDEXIT,
+ vmcs12->secondary_vm_exit_controls)))
+ return -EINVAL;
+
if (CC(!nested_evmcs_is_valid_controls(EVMCS_ENTRY_CTRLS,
vmcs12->vm_entry_controls)))
return -EINVAL;
diff --git a/arch/x86/kvm/vmx/nested.c b/arch/x86/kvm/vmx/nested.c
index ff07d6e736a2..d6341845df43 100644
--- a/arch/x86/kvm/vmx/nested.c
+++ b/arch/x86/kvm/vmx/nested.c
@@ -1411,6 +1411,7 @@ int vmx_set_vmx_msr(struct kvm_vcpu *vcpu, u32 msr_index, u64 data)
case MSR_IA32_VMX_PINBASED_CTLS:
case MSR_IA32_VMX_PROCBASED_CTLS:
case MSR_IA32_VMX_EXIT_CTLS:
+ case MSR_IA32_VMX_EXIT_CTLS2:
case MSR_IA32_VMX_ENTRY_CTLS:
/*
* The "non-true" VMX capability MSRs are generated from the
@@ -1489,6 +1490,9 @@ int vmx_get_vmx_msr(struct nested_vmx_msrs *msrs, u32 msr_index, u64 *pdata)
if (msr_index == MSR_IA32_VMX_EXIT_CTLS)
*pdata |= VM_EXIT_ALWAYSON_WITHOUT_TRUE_MSR;
break;
+ case MSR_IA32_VMX_EXIT_CTLS2:
+ *pdata = msrs->secondary_exit_ctls;
+ break;
case MSR_IA32_VMX_TRUE_ENTRY_CTLS:
case MSR_IA32_VMX_ENTRY_CTLS:
*pdata = vmx_control_msr(
@@ -1692,6 +1696,8 @@ static void copy_enlightened_to_vmcs12(struct vcpu_vmx *vmx, u32 hv_clean_fields
vmcs12->pin_based_vm_exec_control =
evmcs->pin_based_vm_exec_control;
vmcs12->vm_exit_controls = evmcs->vm_exit_controls;
+ vmcs12->secondary_vm_exit_controls =
+ evmcs->secondary_vm_exit_controls;
vmcs12->secondary_vm_exec_control =
evmcs->secondary_vm_exec_control;
}
@@ -1894,6 +1900,7 @@ static void copy_vmcs12_to_enlightened(struct vcpu_vmx *vmx)
* evmcs->vmcs_link_pointer = vmcs12->vmcs_link_pointer;
* evmcs->pin_based_vm_exec_control = vmcs12->pin_based_vm_exec_control;
* evmcs->vm_exit_controls = vmcs12->vm_exit_controls;
+ * evmcs->secondary_vm_exit_controls = vmcs12->secondary_vm_exit_controls;
* evmcs->secondary_vm_exec_control = vmcs12->secondary_vm_exec_control;
* evmcs->page_fault_error_code_mask =
* vmcs12->page_fault_error_code_mask;
@@ -2411,6 +2418,11 @@ static void prepare_vmcs02_early(struct vcpu_vmx *vmx, struct loaded_vmcs *vmcs0
exec_control &= ~VM_EXIT_LOAD_IA32_EFER;
vm_exit_controls_set(vmx, exec_control);

+ if (exec_control & VM_EXIT_ACTIVATE_SECONDARY_CONTROLS) {
+ exec_control = __secondary_vm_exit_controls_get(vmcs01);
+ secondary_vm_exit_controls_set(vmx, exec_control);
+ }
+
/*
* Interrupt/Exception Fields
*/
@@ -6819,13 +6831,17 @@ static void nested_vmx_setup_exit_ctls(struct vmcs_config *vmcs_conf,
VM_EXIT_HOST_ADDR_SPACE_SIZE |
#endif
VM_EXIT_LOAD_IA32_PAT | VM_EXIT_SAVE_IA32_PAT |
- VM_EXIT_CLEAR_BNDCFGS;
+ VM_EXIT_CLEAR_BNDCFGS | VM_EXIT_ACTIVATE_SECONDARY_CONTROLS;
msrs->exit_ctls_high |=
VM_EXIT_ALWAYSON_WITHOUT_TRUE_MSR |
VM_EXIT_LOAD_IA32_EFER | VM_EXIT_SAVE_IA32_EFER |
VM_EXIT_SAVE_VMX_PREEMPTION_TIMER | VM_EXIT_ACK_INTR_ON_EXIT |
VM_EXIT_LOAD_IA32_PERF_GLOBAL_CTRL;

+ /* secondary exit controls */
+ if (msrs->exit_ctls_high & VM_EXIT_ACTIVATE_SECONDARY_CONTROLS)
+ rdmsrl(MSR_IA32_VMX_EXIT_CTLS2, msrs->secondary_exit_ctls);
+
/* We support free control of debug control saving. */
msrs->exit_ctls_low &= ~VM_EXIT_SAVE_DEBUG_CONTROLS;
}
diff --git a/arch/x86/kvm/vmx/vmcs12.c b/arch/x86/kvm/vmx/vmcs12.c
index 106a72c923ca..98457d7b2b23 100644
--- a/arch/x86/kvm/vmx/vmcs12.c
+++ b/arch/x86/kvm/vmx/vmcs12.c
@@ -73,6 +73,7 @@ const unsigned short vmcs12_field_offsets[] = {
FIELD(PAGE_FAULT_ERROR_CODE_MATCH, page_fault_error_code_match),
FIELD(CR3_TARGET_COUNT, cr3_target_count),
FIELD(VM_EXIT_CONTROLS, vm_exit_controls),
+ FIELD(SECONDARY_VM_EXIT_CONTROLS, secondary_vm_exit_controls),
FIELD(VM_EXIT_MSR_STORE_COUNT, vm_exit_msr_store_count),
FIELD(VM_EXIT_MSR_LOAD_COUNT, vm_exit_msr_load_count),
FIELD(VM_ENTRY_CONTROLS, vm_entry_controls),
diff --git a/arch/x86/kvm/vmx/vmcs12.h b/arch/x86/kvm/vmx/vmcs12.h
index 01936013428b..f50f897b9b5f 100644
--- a/arch/x86/kvm/vmx/vmcs12.h
+++ b/arch/x86/kvm/vmx/vmcs12.h
@@ -185,6 +185,7 @@ struct __packed vmcs12 {
u16 host_gs_selector;
u16 host_tr_selector;
u16 guest_pml_index;
+ u64 secondary_vm_exit_controls;
};

/*
@@ -358,6 +359,7 @@ static inline void vmx_check_vmcs12_offsets(void)
CHECK_OFFSET(host_gs_selector, 992);
CHECK_OFFSET(host_tr_selector, 994);
CHECK_OFFSET(guest_pml_index, 996);
+ CHECK_OFFSET(secondary_vm_exit_controls, 998);
}

extern const unsigned short vmcs12_field_offsets[];
diff --git a/arch/x86/kvm/x86.h b/arch/x86/kvm/x86.h
index 63e543c6834b..96ad139adc3f 100644
--- a/arch/x86/kvm/x86.h
+++ b/arch/x86/kvm/x86.h
@@ -47,7 +47,7 @@ void kvm_spurious_fault(void);
* associated feature that KVM supports for nested virtualization.
*/
#define KVM_FIRST_EMULATED_VMX_MSR MSR_IA32_VMX_BASIC
-#define KVM_LAST_EMULATED_VMX_MSR MSR_IA32_VMX_VMFUNC
+#define KVM_LAST_EMULATED_VMX_MSR MSR_IA32_VMX_EXIT_CTLS2

#define KVM_DEFAULT_PLE_GAP 128
#define KVM_VMX_DEFAULT_PLE_WINDOW 4096
--
2.42.0