linux-kernel - Re: [PATCH] KVM: nVMX: emulate the INVVPID instruction

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Message-ID: <BLU436-SMTP112386D52FE3145CBABA7F780440@phx.gbl>
Date:	Wed, 23 Sep 2015 18:30:39 +0800
From:	Wanpeng Li <wanpeng.li@...mail.com>
To:	Paolo Bonzini <pbonzini@...hat.com>
CC:	Jan Kiszka <jan.kiszka@...mens.com>, Bandan Das <bsd@...hat.com>,
	Wincy Van <fanwenyi0529@...il.com>, kvm@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] KVM: nVMX: emulate the INVVPID instruction

On 9/23/15 4:39 PM, Paolo Bonzini wrote:
>
> On 23/09/2015 09:59, Wanpeng Li wrote:
>> Add the INVVPID instruction emulation.
>>
>> Reviewed-by: Wincy Van <fanwenyi0529@...il.com>
>> Signed-off-by: Wanpeng Li <wanpeng.li@...mail.com>
>> ---
>>   arch/x86/include/asm/vmx.h |  1 +
>>   arch/x86/kvm/vmx.c         | 23 ++++++++++++++++++++++-
>>   2 files changed, 23 insertions(+), 1 deletion(-)
>>
>> diff --git a/arch/x86/include/asm/vmx.h b/arch/x86/include/asm/vmx.h
>> index d25f32a..69f3d71 100644
>> --- a/arch/x86/include/asm/vmx.h
>> +++ b/arch/x86/include/asm/vmx.h
>> @@ -397,6 +397,7 @@ enum vmcs_field {
>>   #define IDENTITY_PAGETABLE_PRIVATE_MEMSLOT	(KVM_USER_MEM_SLOTS + 2)
>>   
>>   #define VMX_NR_VPIDS				(1 << 16)
>> +#define VMX_VPID_EXTENT_INDIVIDUAL_ADDR 	0
>>   #define VMX_VPID_EXTENT_SINGLE_CONTEXT		1
>>   #define VMX_VPID_EXTENT_ALL_CONTEXT		2
>>   
>> diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c
>> index 6ad991a..794c529 100644
>> --- a/arch/x86/kvm/vmx.c
>> +++ b/arch/x86/kvm/vmx.c
>> @@ -7189,7 +7189,28 @@ static int handle_invept(struct kvm_vcpu *vcpu)
>>   
>>   static int handle_invvpid(struct kvm_vcpu *vcpu)
>>   {
>> -	kvm_queue_exception(vcpu, UD_VECTOR);
>> +	u32 vmx_instruction_info;
>> +	unsigned long type;
>> +
>> +	if (!nested_vmx_check_permission(vcpu))
>> +		return 1;
>> +
>> +	vmx_instruction_info = vmcs_read32(VMX_INSTRUCTION_INFO);
>> +	type = kvm_register_readl(vcpu, (vmx_instruction_info >> 28) & 0xf);
>> +
>> +	switch (type) {
>> +	case VMX_VPID_EXTENT_INDIVIDUAL_ADDR:
>> +	case VMX_VPID_EXTENT_SINGLE_CONTEXT:
>> +	case VMX_VPID_EXTENT_ALL_CONTEXT:
>> +		vmx_flush_tlb(vcpu);
>> +		nested_vmx_succeed(vcpu);
>> +		break;
>> +	default:
>> +		nested_vmx_failInvalid(vcpu);
>> +		break;
>> +	}
>> +
>> +	skip_emulated_instruction(vcpu);
>>   	return 1;
>>   }
>>   
>>
> This is not enough.  You need to add a VPID argument to
> vpid_sync_vcpu_single, and inline vmx_flush_tlb in handle_invvpid so
> that it can use the new VPID argument of vpid_sync_vcpu_single.
>
> Note that the "all context" variant can be mapped to
> vpid_sync_vcpu_single with vpid02 as the argument (a nice side effect of
> your vpid02 design).
>

Got it. Just send out patches to handle this. :-)

Regards,
Wanpeng Li
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