linux-kernel - Re: [patch V9 30/39] x86/entry: Convert various hypervisor vectors to IDTENTRY

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Date:   Wed, 27 May 2020 14:30:04 +0200
From:   Thomas Gleixner <tglx@...utronix.de>
To:     Wei Liu <wei.liu@...nel.org>, Boqun Feng <boqun.feng@...il.com>
Cc:     LKML <linux-kernel@...r.kernel.org>,
        Andy Lutomirski <luto@...nel.org>,
        Andrew Cooper <andrew.cooper3@...rix.com>,
        X86 ML <x86@...nel.org>,
        "Paul E. McKenney" <paulmck@...nel.org>,
        Alexandre Chartre <alexandre.chartre@...cle.com>,
        Frederic Weisbecker <frederic@...nel.org>,
        Paolo Bonzini <pbonzini@...hat.com>,
        Sean Christopherson <sean.j.christopherson@...el.com>,
        Masami Hiramatsu <mhiramat@...nel.org>,
        Petr Mladek <pmladek@...e.com>,
        Steven Rostedt <rostedt@...dmis.org>,
        Joel Fernandes <joel@...lfernandes.org>,
        Boris Ostrovsky <boris.ostrovsky@...cle.com>,
        Juergen Gross <jgross@...e.com>,
        Brian Gerst <brgerst@...il.com>,
        Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
        Josh Poimboeuf <jpoimboe@...hat.com>,
        Will Deacon <will@...nel.org>,
        Tom Lendacky <thomas.lendacky@....com>,
        Wei Liu <wei.liu@...nel.org>,
        Michael Kelley <mikelley@...rosoft.com>,
        Jason Chen CJ <jason.cj.chen@...el.com>,
        Zhao Yakui <yakui.zhao@...el.com>,
        "Peter Zijlstra \(Intel\)" <peterz@...radead.org>
Subject: Re: [patch V9 30/39] x86/entry: Convert various hypervisor vectors to IDTENTRY_SYSVEC

Wei Liu <wei.liu@...nel.org> writes:
> On Wed, May 27, 2020 at 09:46:16AM +0800, Boqun Feng wrote:
> VMBus is being loaded. That gives me some clue.
>
> I notice a hunk in the patch:
>
> @@ -331,17 +327,19 @@ static void __init ms_hyperv_init_platfo
>         x86_platform.apic_post_init = hyperv_init;
>         hyperv_setup_mmu_ops();
>         /* Setup the IDT for hypervisor callback */
> -       alloc_intr_gate(HYPERVISOR_CALLBACK_VECTOR, hyperv_callback_vector);
> +       alloc_intr_gate(HYPERVISOR_CALLBACK_VECTOR, sysvec_hyperv_callback);
>
> It is not using the asm variant.
>
> Could this be the culprit? Thomas?

Of course ... Sorry