linux-kernel - Re: [PATCH 07/12] KVM: x86: stubs for SMM support

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Date:	Thu, 21 May 2015 16:55:48 +0200
From:	Radim Krčmář <rkrcmar@...hat.com>
To:	Paolo Bonzini <pbonzini@...hat.com>
Cc:	linux-kernel@...r.kernel.org, kvm@...r.kernel.org, bsd@...hat.com
Subject: Re: [PATCH 07/12] KVM: x86: stubs for SMM support

2015-05-08 13:20+0200, Paolo Bonzini:
> This patch adds the interface between x86.c and the emulator: the
> SMBASE register, a new emulator flag, the RSM instruction.  It also
> adds a new request bit that will be used by the KVM_SMI ioctl.
> 
> Signed-off-by: Paolo Bonzini <pbonzini@...hat.com>
> --
> 	RFC->v1: make SMBASE host-readable only
> 		 add support for latching an SMI
> 		 do not reset SMBASE on INIT
> ---
> diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_host.h
> @@ -367,6 +367,7 @@ struct kvm_vcpu_arch {
>  	int32_t apic_arb_prio;
>  	int mp_state;
>  	u64 ia32_misc_enable_msr;
> +	u64 smbase;

smbase is u32 in hardware.

> diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c
> @@ -2504,7 +2504,7 @@ static void nested_vmx_setup_ctls_msrs(struct vcpu_vmx *vmx)
>  	vmx->nested.nested_vmx_misc_low &= VMX_MISC_SAVE_EFER_LMA;
>  	vmx->nested.nested_vmx_misc_low |=
>  		VMX_MISC_EMULATED_PREEMPTION_TIMER_RATE |
> -		VMX_MISC_ACTIVITY_HLT;
> +		VMX_MISC_ACTIVITY_HLT | VMX_MISC_IA32_SMBASE_MSR;

No need to expose this feature when the MSR isn't readable.

> diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
> @@ -2220,6 +2221,11 @@ int kvm_set_msr_common(struct kvm_vcpu *vcpu, struct msr_data *msr_info)
> +	case MSR_IA32_SMBASE:
> +		if (!msr_info->host_initiated)
> +			return 1;
> +		vcpu->arch.smbase = data;
> +		break;
> @@ -2615,6 +2621,11 @@ int kvm_get_msr_common(struct kvm_vcpu *vcpu, struct msr_data *msr_info)
> +	case MSR_IA32_SMBASE:
> +		if (!msr_info->host_initiated)
> +			return 1;
> +		msr_info->data = vcpu->arch.smbase;
> +		break;
--
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