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KVM: nSVM: implement KVM_GET_NESTED_STATE and KVM_SET_NESTED_STATE

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Similar to VMX, the state that is captured through the currently available
IOCTLs is a mix of L1 and L2 state, dependent on whether the L2 guest was
running at the moment when the process was interrupted to save its state.

In particular, the SVM-specific state for nested virtualization includes
the L1 saved state (including the interrupt flag), the cached L2 controls,
and the GIF.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Paolo Bonzini
2020-05-13 13:36:32 -04:00
parent 8ec107c89b
commit cc440cdad5
6 changed files with 171 additions and 7 deletions
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17
arch/x86/include/uapi/asm/kvm.h
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@@ -385,18 +385,22 @@ struct kvm_sync_regs {
#define KVM_X86_QUIRK_MISC_ENABLE_NO_MWAIT (1 << 4)
#define KVM_STATE_NESTED_FORMAT_VMX 0
#define KVM_STATE_NESTED_FORMAT_SVM 1 /* unused */
#define KVM_STATE_NESTED_FORMAT_SVM 1
#define KVM_STATE_NESTED_GUEST_MODE 0x00000001
#define KVM_STATE_NESTED_RUN_PENDING 0x00000002
#define KVM_STATE_NESTED_EVMCS 0x00000004
#define KVM_STATE_NESTED_MTF_PENDING 0x00000008
#define KVM_STATE_NESTED_GIF_SET 0x00000100
#define KVM_STATE_NESTED_SMM_GUEST_MODE 0x00000001
#define KVM_STATE_NESTED_SMM_VMXON 0x00000002
#define KVM_STATE_NESTED_VMX_VMCS_SIZE 0x1000
#define KVM_STATE_NESTED_SVM_VMCB_SIZE 0x1000
struct kvm_vmx_nested_state_data {
__u8 vmcs12[KVM_STATE_NESTED_VMX_VMCS_SIZE];
__u8 shadow_vmcs12[KVM_STATE_NESTED_VMX_VMCS_SIZE];
@@ -411,6 +415,15 @@ struct kvm_vmx_nested_state_hdr {
} smm;
};
struct kvm_svm_nested_state_data {
/* Save area only used if KVM_STATE_NESTED_RUN_PENDING. */
__u8 vmcb12[KVM_STATE_NESTED_SVM_VMCB_SIZE];
};
struct kvm_svm_nested_state_hdr {
__u64 vmcb_pa;
};
/* for KVM_CAP_NESTED_STATE */
struct kvm_nested_state {
__u16 flags;
@@ -419,6 +432,7 @@ struct kvm_nested_state {
union {
struct kvm_vmx_nested_state_hdr vmx;
struct kvm_svm_nested_state_hdr svm;
/* Pad the header to 128 bytes. */
__u8 pad[120];
@@ -431,6 +445,7 @@ struct kvm_nested_state {
*/
union {
struct kvm_vmx_nested_state_data vmx[0];
struct kvm_svm_nested_state_data svm[0];
} data;
};