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Merged
ramosian-glider merged 1 commit into from
Dec 3, 2025
Merged

nested state descriptions #6495

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59 changes: 46 additions & 13 deletions sys/linux/dev_kvm_amd64.txt
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Original file line number Diff line number Diff line change
Expand Up @@ -590,28 +590,61 @@ kvm_guest_debug_arch_x86 {
reg array[int64, 8]
}

kvm_nested_state {
kvm_vmx_smm {
flags flags[kvm_nested_smm_flags, int16]
}

# Size must be 120 bytes to start data at 128 bytes.
kvm_vmx_nested_state_hdr {
vmxon_pa flags[kvm_guest_addrs, int64]
vmcs12_pa flags[kvm_guest_addrs, int64]
smm kvm_vmx_smm
flags flags[kvm_vmx_nested_state_hdr_flags, int32]
preemption_timer_deadline int64
} [size[120]]

kvm_vmx_nested_state_data {
vmcs12 array[int8, KVM_STATE_NESTED_VMX_VMCS_SIZE]
shadow_vmcs12 array[int8, KVM_STATE_NESTED_VMX_VMCS_SIZE]
}

# format = KVM_STATE_NESTED_FORMAT_VMX
kvm_nested_state_vmx {
flags flags[kvm_nested_state_flags, int16]
format const[0, int16]
size bytesize[parent, int32]
hdr kvm_vmx_nested_state
data void
hdr kvm_vmx_nested_state_hdr
data kvm_vmx_nested_state_data
}

# SVM descriptions taken from https://elixir.bootlin.com/linux/latest/source/arch/x86/include/uapi/asm/kvm.h
# Size must be 120 bytes to start data at 128 bytes.
kvm_svm_nested_state_hdr {
vmcb_pa flags[kvm_guest_addrs, int64]
} [size[120]]

kvm_svm_nested_state_data {
vmcb12 array[int8, KVM_STATE_NESTED_SVM_VMCB_SIZE]
}

kvm_nested_state_arg {
state kvm_nested_state
current_vmcs array[int8, VMCS12_SIZE]
shadow_vmcs array[int8, VMCS12_SIZE]
# format = KVM_STATE_NESTED_FORMAT_SVM
kvm_nested_state_svm {
flags flags[kvm_nested_state_flags, int16]
format const[1, int16]
size bytesize[parent, int32]
hdr kvm_svm_nested_state_hdr
data kvm_svm_nested_state_data
}

kvm_vmx_nested_state {
vmxon_pa flags[kvm_guest_addrs, int64]
vmcs_pa flags[kvm_guest_addrs, int64]
smm_flags flags[kvm_nested_smm_flags, int16]
} [size[120]]
# See https://docs.kernel.org/virt/kvm/api.html#kvm-get-nested-state.
kvm_nested_state_arg [
vmx kvm_nested_state_vmx
svm kvm_nested_state_svm
] [varlen]

kvm_nested_state_flags = KVM_STATE_NESTED_GUEST_MODE, KVM_STATE_NESTED_RUN_PENDING
kvm_nested_state_flags = KVM_STATE_NESTED_GUEST_MODE, KVM_STATE_NESTED_RUN_PENDING, KVM_STATE_NESTED_EVMCS, KVM_STATE_NESTED_MTF_PENDING, KVM_STATE_NESTED_GIF_SET
kvm_nested_smm_flags = KVM_STATE_NESTED_SMM_GUEST_MODE, KVM_STATE_NESTED_SMM_VMXON
kvm_vmx_nested_state_hdr_flags = KVM_STATE_VMX_PREEMPTION_TIMER_DEADLINE

kvm_cpuid_entry {
func flags[kvm_cpu_function, int32]
Expand Down
7 changes: 6 additions & 1 deletion sys/linux/dev_kvm_amd64.txt.const
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Original file line number Diff line number Diff line change
Expand Up @@ -154,10 +154,16 @@ KVM_SEV_SNP_PAGE_TYPE_UNMEASURED = 4
KVM_SEV_SNP_PAGE_TYPE_ZERO = 3
KVM_SMI = 44727
KVM_SREGS2_FLAGS_PDPTRS_VALID = 1
KVM_STATE_NESTED_EVMCS = 4
KVM_STATE_NESTED_GIF_SET = 256
KVM_STATE_NESTED_GUEST_MODE = 1
KVM_STATE_NESTED_MTF_PENDING = 8
KVM_STATE_NESTED_RUN_PENDING = 2
KVM_STATE_NESTED_SMM_GUEST_MODE = 1
KVM_STATE_NESTED_SMM_VMXON = 2
KVM_STATE_NESTED_SVM_VMCB_SIZE = 4096
KVM_STATE_NESTED_VMX_VMCS_SIZE = 4096
KVM_STATE_VMX_PREEMPTION_TIMER_DEADLINE = 1
KVM_TPR_ACCESS_REPORTING = 3223891602
KVM_TRANSLATE = 3222843013
KVM_X2APIC_API_DISABLE_BROADCAST_QUIRK = 2
Expand Down Expand Up @@ -203,6 +209,5 @@ MCI_STATUS_PCC = 144115188075855872
MCI_STATUS_S = 72057594037927936
MCI_STATUS_UC = 2305843009213693952
MCI_STATUS_VAL = 9223372036854775808
VMCS12_SIZE = ???
__NR_ioctl = 386:54, amd64:16
__NR_openat = 386:295, amd64:257
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