linux-kernel - Re: [PATCH v19 011/130] KVM: Add new members to struct kvm_gfn

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Date: Fri, 26 Apr 2024 10:13:16 -0700
From: Sean Christopherson <seanjc@...gle.com>
To: Rick P Edgecombe <rick.p.edgecombe@...el.com>
Cc: Tina Zhang <tina.zhang@...el.com>, Hang Yuan <hang.yuan@...el.com>, 
	Kai Huang <kai.huang@...el.com>, 
	"binbin.wu@...ux.intel.com" <binbin.wu@...ux.intel.com>, Bo2 Chen <chen.bo@...el.com>, 
	"sagis@...gle.com" <sagis@...gle.com>, 
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>, 
	"isaku.yamahata@...ux.intel.com" <isaku.yamahata@...ux.intel.com>, "tabba@...gle.com" <tabba@...gle.com>, 
	"isaku.yamahata@...il.com" <isaku.yamahata@...il.com>, Erdem Aktas <erdemaktas@...gle.com>, 
	Isaku Yamahata <isaku.yamahata@...el.com>, "kvm@...r.kernel.org" <kvm@...r.kernel.org>, 
	"pbonzini@...hat.com" <pbonzini@...hat.com>
Subject: Re: [PATCH v19 011/130] KVM: Add new members to struct kvm_gfn_range
 to operate on

On Fri, Apr 26, 2024, Rick P Edgecombe wrote:
> On Fri, 2024-04-26 at 09:49 -0700, Sean Christopherson wrote:
> > 
> > Heh, where's your bitmask abuse spirit?  It's a little evil (and by "evil"
> > I mean awesome), but the need to process different roots is another good
> > argument for an enum+bitmask.
> 
> Haha. There seems to be some special love for bit math in KVM. I was just
> relaying my struggle to understand permission_fault() the other day.

LOL, you and everyone else that's ever looked at that code.  Just wait until you
run into one of Paolo's decimal-based bitmasks.