From: Peter Zijlstra <peterz@infradead.org>
To: Sean Christopherson <seanjc@google.com>
Cc: "H. Peter Anvin" <hpa@zytor.com>,
x86@kernel.org, kys@microsoft.com, haiyangz@microsoft.com,
wei.liu@kernel.org, decui@microsoft.com, tglx@linutronix.de,
mingo@redhat.com, bp@alien8.de, dave.hansen@linux.intel.com,
pbonzini@redhat.com, ardb@kernel.org, kees@kernel.org,
Arnd Bergmann <arnd@arndb.de>,
gregkh@linuxfoundation.org, jpoimboe@kernel.org,
linux-hyperv@vger.kernel.org, linux-kernel@vger.kernel.org,
kvm@vger.kernel.org, linux-efi@vger.kernel.org,
samitolvanen@google.com, ojeda@kernel.org, xin@zytor.com
Subject: Re: [PATCH v2 00/13] objtool: Detect and warn about indirect calls in __nocfi functions
Date: Fri, 2 May 2025 10:40:07 +0200 [thread overview]
Message-ID: <20250502084007.GS4198@noisy.programming.kicks-ass.net> (raw)
In-Reply-To: <aBO9uoLnxCSD0UwT@google.com>
On Thu, May 01, 2025 at 11:30:18AM -0700, Sean Christopherson wrote:
> Uh, aren't you making this way more complex than it needs to be?
Possibly :-)
> IIUC, KVM never
> uses the FRED hardware entry points, i.e. the FRED entry tables don't need to be
> in place because they'll never be used. The only bits of code KVM needs is the
> __fred_entry_from_kvm() glue.
But __fred_entry_from_kvm() calls into fred_extint(), which then
directly uses the fred sysvec_table[] for dispatch. How would we not
have to set up that table?
> Lightly tested, but this combo works for IRQs and NMIs on non-FRED hardware.
So the FRED NMI code is significantly different from the IDT NMI code
and I really didn't want to go mixing those.
If we get a nested NMI I don't think it'll behave well.
next prev parent reply other threads:[~2025-05-02 8:41 UTC|newest]
Thread overview: 52+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-04-30 11:07 [PATCH v2 00/13] objtool: Detect and warn about indirect calls in __nocfi functions Peter Zijlstra
2025-04-30 11:07 ` [PATCH v2 01/13] x86/kvm/emulate: Implement test_cc() in C Peter Zijlstra
2025-04-30 11:07 ` [PATCH v2 02/13] x86/kvm/emulate: Introduce COP1 Peter Zijlstra
2025-04-30 16:19 ` Josh Poimboeuf
2025-04-30 19:05 ` Peter Zijlstra
2025-04-30 11:07 ` [PATCH v2 03/13] x86/kvm/emulate: Introduce COP2 Peter Zijlstra
2025-04-30 11:07 ` [PATCH v2 04/13] x86/kvm/emulate: Introduce COP2R Peter Zijlstra
2025-04-30 11:07 ` [PATCH v2 05/13] x86/kvm/emulate: Introduce COP2W Peter Zijlstra
2025-04-30 11:07 ` [PATCH v2 06/13] x86/kvm/emulate: Introduce COP2CL Peter Zijlstra
2025-04-30 11:07 ` [PATCH v2 07/13] x86/kvm/emulate: Introduce COP1SRC2 Peter Zijlstra
2025-04-30 11:07 ` [PATCH v2 08/13] x86/kvm/emulate: Introduce COP3WCL Peter Zijlstra
2025-04-30 11:07 ` [PATCH v2 09/13] x86/kvm/emulate: Convert em_salc() to C Peter Zijlstra
2025-04-30 11:07 ` [PATCH v2 10/13] x86/kvm/emulate: Remove fastops Peter Zijlstra
2025-04-30 11:07 ` [PATCH v2 11/13] x86,hyperv: Clean up hv_do_hypercall() Peter Zijlstra
2025-05-01 2:36 ` Michael Kelley
2025-04-30 11:07 ` [PATCH v2 12/13] x86_64,hyperv: Use direct call to hypercall-page Peter Zijlstra
2025-05-01 2:36 ` Michael Kelley
2025-05-01 8:59 ` Peter Zijlstra
2025-04-30 11:07 ` [PATCH v2 13/13] objtool: Validate kCFI calls Peter Zijlstra
2025-04-30 15:59 ` Josh Poimboeuf
2025-04-30 19:03 ` Peter Zijlstra
2025-05-01 15:56 ` Peter Zijlstra
2025-04-30 14:24 ` [PATCH v2 00/13] objtool: Detect and warn about indirect calls in __nocfi functions H. Peter Anvin
2025-04-30 19:06 ` Peter Zijlstra
2025-05-01 10:30 ` Peter Zijlstra
2025-05-01 15:38 ` Peter Zijlstra
2025-05-01 18:30 ` Sean Christopherson
2025-05-01 18:42 ` H. Peter Anvin
2025-05-01 18:59 ` Sean Christopherson
2025-05-02 6:12 ` Xin Li
2025-05-02 5:46 ` Xin Li
2025-05-02 5:48 ` Xin Li
2025-05-02 19:43 ` H. Peter Anvin
2025-05-02 8:40 ` Peter Zijlstra [this message]
2025-05-02 19:53 ` Sean Christopherson
2025-05-03 9:50 ` Peter Zijlstra
2025-05-03 18:28 ` Josh Poimboeuf
2025-05-06 7:31 ` Peter Zijlstra
2025-05-06 13:32 ` Peter Zijlstra
2025-05-06 19:18 ` Josh Poimboeuf
2025-05-28 7:44 ` Peter Zijlstra
2025-05-28 16:30 ` Peter Zijlstra
2025-05-28 16:35 ` Peter Zijlstra
2025-05-29 9:30 ` Peter Zijlstra
2025-06-03 5:43 ` Josh Poimboeuf
2025-06-03 16:29 ` Josh Poimboeuf
2025-06-05 17:19 ` Josh Poimboeuf
2025-06-06 10:49 ` Peter Zijlstra
2025-06-06 13:15 ` Sean Christopherson
2025-06-06 13:20 ` Peter Zijlstra
2025-05-01 18:33 ` Paolo Bonzini
2025-05-02 11:08 ` Peter Zijlstra
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