linux-kernel - Re: [PATCH v19 013/130] KVM: x86: Use PFERR_GUEST_ENC

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Date: Thu, 7 Mar 2024 15:04:39 +0800
From: Yin Fengwei <fengwei.yin@...el.com>
To: <isaku.yamahata@...el.com>, <kvm@...r.kernel.org>,
	<linux-kernel@...r.kernel.org>
CC: <isaku.yamahata@...il.com>, Paolo Bonzini <pbonzini@...hat.com>,
	<erdemaktas@...gle.com>, Sean Christopherson <seanjc@...gle.com>, Sagi Shahar
	<sagis@...gle.com>, Kai Huang <kai.huang@...el.com>, <chen.bo@...el.com>,
	<hang.yuan@...el.com>, <tina.zhang@...el.com>
Subject: Re: [PATCH v19 013/130] KVM: x86: Use PFERR_GUEST_ENC_MASK to
 indicate fault is private



On 2/26/24 16:25, isaku.yamahata@...el.com wrote:
> +	/*
> +	 * This is racy with updating memory attributes with mmu_seq.  If we
> +	 * hit a race, it would result in retrying page fault.
> +	 */
> +	if (vcpu->kvm->arch.vm_type == KVM_X86_SW_PROTECTED_VM &&
There are more than two times of similar check in this patchset.
Maybe it's better to add a helper function to tell whether the type
is KVM_X86_SW_PROTECTED_VM?


Regards
Yin, Fengwei

> +	    kvm_mem_is_private(vcpu->kvm, gpa_to_gfn(cr2_or_gpa)))
> +		error_code |= PFERR_GUEST_ENC_MASK;
> +