linux-kernel - Re: [PATCH RFC 4/4] VMX: Expose the LA57 feature to VM

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Date:   Thu, 9 Mar 2017 16:16:37 +0100
From:   Paolo Bonzini <pbonzini@...hat.com>
To:     Liang Li <liang.z.li@...el.com>, kvm@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org, tglx@...utronix.de, mingo@...hat.com,
        kirill.shutemov@...ux.intel.com, dave.hansen@...ux.intel.com,
        guangrong.xiao@...ux.intel.com, rkrcmar@...hat.com
Subject: Re: [PATCH RFC 4/4] VMX: Expose the LA57 feature to VM



On 29/12/2016 10:26, Liang Li wrote:
> -		if (is_noncanonical_address(la))
> +		if (is_noncanonical_address(la, virt_addr_bits(ctxt)))

Using virt_addr_bits and get_virt_addr_bits is quite a mouthful.  What
about using instead a pair of functions like these:

bool is_noncanonical_address(struct kvm_vcpu *vcpu, u64 addr)
{
	return addr == get_canonical(addr, get_virt_addr_bits(vcpu));
}

bool emulate_is_noncanonical_address(struct x86_emulate_ctxt *ctxt,
				     u64 addr)
{
	return addr == get_canonical(addr, virt_addr_bits(ctxt));
}


Paolo