linux-kernel - RE: [RFC RFT PATCH 0/4] Handle set_memory

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Date: Thu, 7 Mar 2024 20:25:28 +0000
From: Michael Kelley <mhklinux@...look.com>
To: "Edgecombe, Rick P" <rick.p.edgecombe@...el.com>,
	"linux-coco@...ts.linux.dev" <linux-coco@...ts.linux.dev>,
	"dave.hansen@...ux.intel.com" <dave.hansen@...ux.intel.com>,
	"davem@...emloft.net" <davem@...emloft.net>, "haiyangz@...rosoft.com"
	<haiyangz@...rosoft.com>, "kirill.shutemov@...ux.intel.com"
	<kirill.shutemov@...ux.intel.com>, "pabeni@...hat.com" <pabeni@...hat.com>,
	"edumazet@...gle.com" <edumazet@...gle.com>, "linux-kernel@...r.kernel.org"
	<linux-kernel@...r.kernel.org>, "kys@...rosoft.com" <kys@...rosoft.com>,
	"Cui, Dexuan" <decui@...rosoft.com>, "kuba@...nel.org" <kuba@...nel.org>,
	"linux-hyperv@...r.kernel.org" <linux-hyperv@...r.kernel.org>,
	"wei.liu@...nel.org" <wei.liu@...nel.org>, "gregkh@...uxfoundation.org"
	<gregkh@...uxfoundation.org>, "netdev@...r.kernel.org"
	<netdev@...r.kernel.org>
CC: "sathyanarayanan.kuppuswamy@...ux.intel.com"
	<sathyanarayanan.kuppuswamy@...ux.intel.com>, "Reshetova, Elena"
	<elena.reshetova@...el.com>
Subject: RE: [RFC RFT PATCH 0/4] Handle  set_memory_XXcrypted() errors in
 hyperv

From: Edgecombe, Rick P <rick.p.edgecombe@...el.com> Sent: Thursday, March 7, 2024 11:12 AM
> 
> On Thu, 2024-03-07 at 17:11 +0000, Michael Kelley wrote:
> > Using your patches plus the changes in my comments, I've
> > done most of the testing described above. The normal
> > paths work, and when I hack set_memory_encrypted()
> > to fail, the error paths correctly did not free the memory.
> > I checked both the ring buffer memory and the additional
> > vmalloc memory allocated by the netvsc driver and the uio
> > driver.  The memory status can be checked after-the-fact
> > via /proc/vmmallocinfo and /proc/buddyinfo since these
> > are mostly large allocations. As expected, the drivers
> > output their own error messages after the failures to
> > teardown the GPADLs.
> >
> > I did not test the vmbus_disconnect() path since that
> > effectively kills the VM.
> >
> > I tested in a normal VM, and in an SEV-SNP VM.  I didn't
> > specifically test in a TDX VM, but given that Hyper-V CoCo
> > guests run with a paravisor, the guest sees the same thing
> > either way.
> 
> Thanks Michael! How would you feel about reposting the patches with
> your changes added? I think you have a very good handle on the part of
> the problem I understand, and additionally much more familiarity with
> these drivers.

Yes, I can submit a new version.

Michael