Re: [PATCH 1/2] KVM: VMX: Sanitize VM-Entry/VM-Exit control pairs at kvm_intel load time

[Paolo Bonzini]

On 5/25/22 23:04, Sean Christopherson wrote:
>   
> +#define VMCS_ENTRY_EXIT_PAIR(name, entry_action, exit_action) \
> +	{ VM_ENTRY_##entry_action##_##name, VM_EXIT_##exit_action##_##name }
> +
>   static __init int setup_vmcs_config(struct vmcs_config *vmcs_conf,
>   				    struct vmx_capability *vmx_cap)
>   {
> @@ -2473,6 +2476,24 @@ 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;
> +	int i;
> +
> +	/*
> +	 * LOAD/SAVE_DEBUG_CONTROLS are absent because both are mandatory.
> +	 * SAVE_IA32_PAT and SAVE_IA32_EFER are absent because KVM always
> +	 * intercepts writes to PAT and EFER, i.e. never enables those controls.
> +	 */
> +	struct {
> +		u32 entry_control;
> +		u32 exit_control;
> +	} vmcs_entry_exit_pairs[] = {
> +		VMCS_ENTRY_EXIT_PAIR(IA32_PERF_GLOBAL_CTRL, LOAD, LOAD),
> +		VMCS_ENTRY_EXIT_PAIR(IA32_PAT, LOAD, LOAD),
> +		VMCS_ENTRY_EXIT_PAIR(IA32_EFER, LOAD, LOAD),
> +		VMCS_ENTRY_EXIT_PAIR(BNDCFGS, LOAD, CLEAR),
> +		VMCS_ENTRY_EXIT_PAIR(IA32_RTIT_CTL, LOAD, CLEAR),
> +		VMCS_ENTRY_EXIT_PAIR(IA32_LBR_CTL, LOAD, CLEAR),

No macros please, it's just as clear to expand them especially since the 
#define is far from the struct definition.

Paolo