From: Jarkko Sakkinen <jarkko@kernel.org>
To: Dave Hansen <dave.hansen@intel.com>
Cc: "Huang, Kai" <kai.huang@intel.com>,
Andrew Zaborowski <andrew.zaborowski@intel.com>,
x86@kernel.org, linux-sgx@vger.kernel.org,
linux-kernel@vger.kernel.org,
Dave Hansen <dave.hansen@linux.intel.com>,
Tony Luck <tony.luck@intel.com>,
Thomas Gleixner <tglx@linutronix.de>,
Borislav Petkov <bp@alien8.de>, Ingo Molnar <mingo@redhat.com>,
"H . Peter Anvin" <hpa@zytor.com>,
balrogg@gmail.com
Subject: Re: [PATCH] x86: sgx: Don't track poisoned pages for reclaiming
Date: Wed, 12 Feb 2025 23:25:04 +0200 [thread overview]
Message-ID: <Z60RsC1h94UdsjRb@kernel.org> (raw)
In-Reply-To: <7ed9b288-69a2-446c-9f7f-50ef6bc56673@intel.com>
On Tue, Feb 11, 2025 at 03:31:54PM -0800, Dave Hansen wrote:
> On 2/11/25 13:18, Huang, Kai wrote:
> >>> This requires low-level SGX implementation knowledge to fully
> >>> understand. Both what "ETRACK, EBLOCK and EWB" are in the first place,
> >>> how they are involved in reclaim and also why EREMOVE doesn't lead to
> >>> the same fate.
> >>
> >> Does it? [I'll dig up Intel SDM to check this]
> >>
> > I just did. 🙂
> >
> > It seems EREMOVE only reads and updates the EPCM entry for the target
> > EPC page but won't actually access that EPC page.
>
> Actually, now that I think about it even more, why would ETRACK or
> EBLOCK access the page itself? They seem superficially like they'd be
> metadata-only too.
Did a sanity check to SDM.
I think you're correct, and also there's zero rational reason them use
anything but EPCM (no legit reason to access payload itself).
BR, Jarkko
next prev parent reply other threads:[~2025-02-12 21:25 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-02-11 15:01 Andrew Zaborowski
2025-02-11 16:25 ` Dave Hansen
2025-02-11 21:03 ` Jarkko Sakkinen
2025-02-11 21:18 ` Huang, Kai
2025-02-11 23:24 ` Jarkko Sakkinen
2025-02-11 23:31 ` Dave Hansen
2025-02-12 0:32 ` andrzej zaborowski
2025-02-12 0:37 ` Dave Hansen
2025-02-12 10:38 ` Huang, Kai
2025-02-12 21:25 ` Jarkko Sakkinen [this message]
2025-02-12 0:22 ` Andrew Zaborowski
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