From: Peter Zijlstra <peterz@infradead.org>
To: "Luck, Tony" <tony.luck@intel.com>
Cc: "H. Peter Anvin" <hpa@zytor.com>,
Pawan Gupta <pawan.kumar.gupta@linux.intel.com>,
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: Wed, 25 Oct 2023 00:30:23 +0200 [thread overview]
Message-ID: <20231024223023.GI33965@noisy.programming.kicks-ass.net> (raw)
In-Reply-To: <SJ1PR11MB6083E3E2D35B30F4E40E8FE7FCDFA@SJ1PR11MB6083.namprd11.prod.outlook.com>
On Tue, Oct 24, 2023 at 06:49:07PM +0000, Luck, Tony wrote:
> > 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
There is. The 4k TLBs really hurt. Thomas and me ran into that when
doing the retbleed call depth crud. Similarly Song ran into it with BPF,
they really want eBPF JIT to write to large pages.
next prev parent reply other threads:[~2023-10-24 22:31 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
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 [this message]
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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