linux-kernel - Re: [PATCH v1 4/4] KVM: MMU: Expose the LA57 feature to VM.

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Message-ID: <040155e8-510a-3ada-9d83-f4b489d0981f@linux.intel.com>
Date:   Thu, 17 Aug 2017 19:53:04 +0800
From:   Yu Zhang <yu.c.zhang@...ux.intel.com>
To:     Paolo Bonzini <pbonzini@...hat.com>, kvm@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org, rkrcmar@...hat.com,
        tglx@...utronix.de, mingo@...hat.com, hpa@...or.com,
        xiaoguangrong@...cent.com, joro@...tes.org
Subject: Re: [PATCH v1 4/4] KVM: MMU: Expose the LA57 feature to VM.



On 8/17/2017 7:57 PM, Paolo Bonzini wrote:
> On 12/08/2017 15:35, Yu Zhang wrote:
>> index a98b88a..50107ae 100644
>> --- a/arch/x86/kvm/emulate.c
>> +++ b/arch/x86/kvm/emulate.c
>> @@ -694,7 +694,7 @@ static __always_inline int __linearize(struct x86_emulate_ctxt *ctxt,
>>   	switch (mode) {
>>   	case X86EMUL_MODE_PROT64:
>>   		*linear = la;
>> -		if (is_noncanonical_address(la))
>> +		if (emul_is_noncanonical_address(la, ctxt))
>>   			goto bad;
>>   
>>   		*max_size = min_t(u64, ~0u, (1ull << 48) - la);
> Oops, you missed one here.  Probably best to use ctxt_virt_addr_bits and
> then "inline" emul_is_noncanonical_address as "get_canonical(la,
> va_bits) != la".

Sorry, I just sent out the v2 patch set without noticing this reply. :-)

The emul_is_noncanonical() is defined in x86.h so that no 
ctxt_virt_addr_bits needed in emulate.c, are you
suggesting to use ctx_virt_addr_bits in this file each time before 
emul_is_noncanonical_address() is called?

Yu

> Paolo
>