From: "Luck, Tony" <tony.luck@intel.com>
To: "H. Peter Anvin" <hpa@zytor.com>,
Peter Zijlstra <peterz@infradead.org>,
Pawan Gupta <pawan.kumar.gupta@linux.intel.com>
Cc: Thomas Gleixner <tglx@linutronix.de>,
Ingo Molnar <mingo@redhat.com>, Borislav Petkov <bp@alien8.de>,
Dave Hansen <dave.hansen@linux.intel.com>,
"x86@kernel.org" <x86@kernel.org>,
Josh Poimboeuf <jpoimboe@kernel.org>,
"Lutomirski, Andy" <luto@kernel.org>,
Jonathan Corbet <corbet@lwn.net>, "Christopherson,,
Sean" <seanjc@google.com>, Paolo Bonzini <pbonzini@redhat.com>,
"ak@linux.intel.com" <ak@linux.intel.com>,
"tim.c.chen@linux.intel.com" <tim.c.chen@linux.intel.com>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
"linux-doc@vger.kernel.org" <linux-doc@vger.kernel.org>,
"kvm@vger.kernel.org" <kvm@vger.kernel.org>,
Alyssa Milburn <alyssa.milburn@linux.intel.com>,
Daniel Sneddon <daniel.sneddon@linux.intel.com>,
"antonio.gomez.iglesias@linux.intel.com"
<antonio.gomez.iglesias@linux.intel.com>,
"Milburn, Alyssa" <alyssa.milburn@intel.com>
Subject: RE: [PATCH v2 1/6] x86/bugs: Add asm helpers for executing VERW
Date: Tue, 24 Oct 2023 18:49:07 +0000 [thread overview]
Message-ID: <SJ1PR11MB6083E3E2D35B30F4E40E8FE7FCDFA@SJ1PR11MB6083.namprd11.prod.outlook.com> (raw)
In-Reply-To: <DD2F34A0-4F2F-4C8C-A634-7DBEF31C40F0@zytor.com>
> the only overhead to modules other than load time (including the runtime linking) is that modules can't realistically be mapped using large page entries.
If there were some significant win for using large pages, couldn't the
kernel pre-allocate some 2MB pages in the [-2GiB,0) range? Boot parameter
for how many (perhaps two for separate code/data pages). First few loaded
modules get to use that space until it is all gone.
It would all be quite messy if those modules were later unloaded/reloaded
... so there would have to be some compelling benchmarks to justify
the complexity.
That's probably why Peter said "can't realistically".
-Tony
next prev parent reply other threads:[~2023-10-24 18:49 UTC|newest]
Thread overview: 31+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-10-24 8:08 [PATCH v2 0/6] Delay VERW Pawan Gupta
2023-10-24 8:08 ` [PATCH v2 1/6] x86/bugs: Add asm helpers for executing VERW Pawan Gupta
2023-10-24 10:36 ` Peter Zijlstra
2023-10-24 16:35 ` Pawan Gupta
2023-10-24 16:36 ` Peter Zijlstra
2023-10-24 16:45 ` Pawan Gupta
2023-10-24 17:02 ` Peter Zijlstra
2023-10-24 17:30 ` Pawan Gupta
2023-10-24 18:27 ` H. Peter Anvin
2023-10-24 18:49 ` Luck, Tony [this message]
2023-10-24 19:14 ` H. Peter Anvin
2023-10-24 19:40 ` Luck, Tony
2023-10-24 20:30 ` H. Peter Anvin
2023-10-24 22:30 ` Peter Zijlstra
2023-10-24 22:28 ` Peter Zijlstra
2023-10-25 4:00 ` Pawan Gupta
2023-10-25 6:56 ` Peter Zijlstra
2023-10-25 15:06 ` Pawan Gupta
2023-10-25 6:58 ` Peter Zijlstra
2023-10-25 15:10 ` Pawan Gupta
2023-10-24 8:08 ` [PATCH v2 2/6] x86/entry_64: Add VERW just before userspace transition Pawan Gupta
2023-10-24 8:08 ` [PATCH v2 3/6] x86/entry_32: " Pawan Gupta
2023-10-24 8:08 ` [PATCH v2 4/6] x86/bugs: Use ALTERNATIVE() instead of mds_user_clear static key Pawan Gupta
2023-10-25 22:08 ` kernel test robot
2023-10-24 8:08 ` [PATCH v2 5/6] KVM: VMX: Use BT+JNC, i.e. EFLAGS.CF to select VMRESUME vs. VMLAUNCH Pawan Gupta
2023-10-25 8:15 ` Nikolay Borisov
2023-10-24 8:08 ` [PATCH v2 6/6] KVM: VMX: Move VERW closer to VMentry for MDS mitigation Pawan Gupta
2023-10-25 7:47 ` Chao Gao
2023-10-25 15:15 ` Pawan Gupta
2023-10-24 12:26 ` [PATCH v2 0/6] Delay VERW Matthew Wilcox
2023-10-24 17:01 ` Pawan Gupta
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