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

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Date:   Thu, 17 Aug 2017 13:57:47 +0200
From:   Paolo Bonzini <pbonzini@...hat.com>
To:     Yu Zhang <yu.c.zhang@...ux.intel.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 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".

Paolo