linux-kernel - Re: [PATCH v7 8/9] mmu: spp: Handle SPP protected pages when VM memory changes

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Date:   Thu, 21 Nov 2019 23:01:50 +0800
From:   Yang Weijiang <weijiang.yang@...el.com>
To:     Paolo Bonzini <pbonzini@...hat.com>
Cc:     Yang Weijiang <weijiang.yang@...el.com>, kvm@...r.kernel.org,
        linux-kernel@...r.kernel.org, jmattson@...gle.com,
        sean.j.christopherson@...el.com, yu.c.zhang@...ux.intel.com,
        alazar@...defender.com, edwin.zhai@...el.com
Subject: Re: [PATCH v7 8/9] mmu: spp: Handle SPP protected pages when VM
 memory changes

On Thu, Nov 21, 2019 at 11:32:15AM +0100, Paolo Bonzini wrote:
> On 19/11/19 09:49, Yang Weijiang wrote:
> > +			/*
> > +			 * if it's EPT leaf entry and the physical page is
> > +			 * SPP protected, then re-enable SPP protection for
> > +			 * the page.
> > +			 */
> > +			if (kvm->arch.spp_active &&
> > +			    level == PT_PAGE_TABLE_LEVEL) {
> > +				struct kvm_subpage spp_info = {0};
> > +				int i;
> > +
> > +				spp_info.base_gfn = gfn;
> > +				spp_info.npages = 1;
> > +				i = kvm_spp_get_permission(kvm, &spp_info);
> > +				if (i == 1 &&
> > +				    spp_info.access_map[0] != FULL_SPP_ACCESS)
> > +					new_spte |= PT_SPP_MASK;
> > +			}
> 
> This can use gfn_to_subpage_wp_info directly (or is_spp_protected if you
> prefer).
>
Sure, will change it, thank you!
> Paolo