From: Wei Liu <wei.liu@kernel.org>
To: Boqun Feng <boqun.feng@gmail.com>, Thomas Gleixner <tglx@linutronix.de>
Cc: Thomas Gleixner <tglx@linutronix.de>,
LKML <linux-kernel@vger.kernel.org>,
Andy Lutomirski <luto@kernel.org>,
Andrew Cooper <andrew.cooper3@citrix.com>,
X86 ML <x86@kernel.org>, "Paul E. McKenney" <paulmck@kernel.org>,
Alexandre Chartre <alexandre.chartre@oracle.com>,
Frederic Weisbecker <frederic@kernel.org>,
Paolo Bonzini <pbonzini@redhat.com>,
Sean Christopherson <sean.j.christopherson@intel.com>,
Masami Hiramatsu <mhiramat@kernel.org>,
Petr Mladek <pmladek@suse.com>,
Steven Rostedt <rostedt@goodmis.org>,
Joel Fernandes <joel@joelfernandes.org>,
Boris Ostrovsky <boris.ostrovsky@oracle.com>,
Juergen Gross <jgross@suse.com>, Brian Gerst <brgerst@gmail.com>,
Mathieu Desnoyers <mathieu.desnoyers@efficios.com>,
Josh Poimboeuf <jpoimboe@redhat.com>,
Will Deacon <will@kernel.org>,
Tom Lendacky <thomas.lendacky@amd.com>,
Wei Liu <wei.liu@kernel.org>,
Michael Kelley <mikelley@microsoft.com>,
Jason Chen CJ <jason.cj.chen@intel.com>,
Zhao Yakui <yakui.zhao@intel.com>,
"Peter Zijlstra (Intel)" <peterz@infradead.org>
Subject: Re: [patch V9 30/39] x86/entry: Convert various hypervisor vectors to IDTENTRY_SYSVEC
Date: Wed, 27 May 2020 12:09:18 +0000 [thread overview]
Message-ID: <20200527120918.ly5vuhvxzqesdt6j@liuwe-devbox-debian-v2.j3c5onc20sse1dnehy4noqpfcg.zx.internal.cloudapp.net> (raw)
In-Reply-To: <20200527083803.gpigonfy2kd2g5t4@debian>
On Wed, May 27, 2020 at 09:38:03AM +0100, Wei Liu wrote:
> On Wed, May 27, 2020 at 09:46:16AM +0800, Boqun Feng wrote:
> > Hi Thomas,
> >
> > On Thu, May 21, 2020 at 10:05:43PM +0200, Thomas Gleixner wrote:
> > > From: Thomas Gleixner <tglx@linutronix.de>
> > >
> > > Convert various hypervisor vectors to IDTENTRY_SYSVEC
> > > - Implement the C entry point with DEFINE_IDTENTRY_SYSVEC
> > > - Emit the ASM stub with DECLARE_IDTENTRY_SYSVEC
> > > - Remove the ASM idtentries in 64bit
> > > - Remove the BUILD_INTERRUPT entries in 32bit
> > > - Remove the old prototypes
> > >
> > > No functional change.
> > >
> > > Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
> > > Acked-by: Andy Lutomirski <luto@kernel.org>
> >
> > I hit the following while trying to test the whole patchset on a Hyper-V
> > guest, and git bisect told me this patch introduced the problem, the
> > config file is in the attachment.
> >
> > Regards,
> > Boqun
> >
>
> Hi Boqun,
>
> Thanks for testing and reporting.
>
> This patch modifies Hyper-V's entry point so no wonder you pin down this
> patch.
>
> > [ 3.366637] BUG: kernel NULL pointer dereference, address: 0000000000000010
> > [ 3.369959] #PF: supervisor instruction fetch in kernel mode
> > [ 3.369959] #PF: error_code(0x0010) - not-present page
> > [ 3.369959] PGD 0 P4D 0
> > [ 3.369959] Oops: 0010 [#1] PREEMPT SMP PTI
> > [ 3.369959] CPU: 27 PID: 0 Comm: swapper/27 Not tainted 5.7.0-rc5-00374-ge2d215d23d72 #23
> > [ 3.369959] Hardware name: Microsoft Corporation Virtual Machine/Virtual Machine, BIOS Hyper-V UEFI Release v4.0 05/16/2019
> > [ 3.369959] RIP: 0010:0x10
>
> Hmmm... NULL pointer here.
>
> > [ 3.369959] Code: Bad RIP value.
> > [ 3.369959] RSP: 0000:ffffbf444018beb8 EFLAGS: 00010086
> > [ 3.369959] RAX: 000000000000001b RBX: ffffa04620900000 RCX: 00000000c8aab6dc
> > [ 3.369959] RDX: 0000000000000001 RSI: ffffffffb390feaf RDI: ffffffffb3919e60
> > [ 3.369959] RBP: 000000000000001b R08: 0000000000000000 R09: 0000000000000101
> > [ 3.369959] R10: 0000000000dda899 R11: 0000000001d417ad R12: 0000000000000000
> > [ 3.369959] R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
> > [ 3.369959] FS: 0000000000000000(0000) GS:ffffa04627ac0000(0000) knlGS:0000000000000000
> > [ 3.369959] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> > [ 3.369959] CR2: ffffffffffffffe6 CR3: 000000101bcba002 CR4: 00000000003606e0
> > [ 3.369959] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
> > [ 3.369959] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
> > [ 3.369959] Call Trace:
> > [ 3.369959] ? default_idle+0x1c/0x190
> > [ 3.369959] ? do_idle+0x1cd/0x230
> > [ 3.369959] ? cpu_startup_entry+0x19/0x20
> > [ 3.369959] ? secondary_startup_64+0xa4/0xb0
>
> And I certainly didn't expect this.
>
> > [ 3.369959] Modules linked in: crc32c_intel hv_vmbus(+)
>
> 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?
>
I'm able to reproduce the issue locally. And after applying the
following diff I'm able to get a VM booting again on Hyper-V.
diff --git a/arch/x86/kernel/cpu/mshyperv.c b/arch/x86/kernel/cpu/mshyperv.c
index a103e1c0b90e..af94f05a5c66 100644
--- a/arch/x86/kernel/cpu/mshyperv.c
+++ b/arch/x86/kernel/cpu/mshyperv.c
@@ -327,7 +327,7 @@ static void __init ms_hyperv_init_platform(void)
x86_platform.apic_post_init = hyperv_init;
hyperv_setup_mmu_ops();
/* Setup the IDT for hypervisor callback */
- alloc_intr_gate(HYPERVISOR_CALLBACK_VECTOR, sysvec_hyperv_callback);
+ alloc_intr_gate(HYPERVISOR_CALLBACK_VECTOR, asm_sysvec_hyperv_callback);
/* Setup the IDT for reenlightenment notifications */
if (ms_hyperv.features & HV_X64_ACCESS_REENLIGHTENMENT) {
Boqun, can you give this a try?
Thomas, feel free to fold this in.
Wei.
next prev parent reply other threads:[~2020-05-27 12:09 UTC|newest]
Thread overview: 132+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-05-21 20:05 [patch V9 00/39] x86/entry: Rework leftovers (was part V) Thomas Gleixner
2020-05-21 20:05 ` [patch V9 01/39] nmi, tracing: Make hardware latency tracing noinstr safe Thomas Gleixner
2020-05-27 8:12 ` [tip: x86/entry] " tip-bot2 for Thomas Gleixner
2020-05-21 20:05 ` [patch V9 02/39] rcu: Abstract out rcu_irq_enter_check_tick() from rcu_nmi_enter() Thomas Gleixner
2020-05-21 21:03 ` Paul E. McKenney
2020-05-21 21:25 ` Thomas Gleixner
2020-05-26 8:14 ` Ingo Molnar
2020-05-26 15:34 ` Paul E. McKenney
2020-05-27 8:12 ` [tip: x86/entry] " tip-bot2 for Paul E. McKenney
2020-05-21 20:05 ` [patch V9 03/39] rcu: Provide rcu_irq_exit_check_preempt() Thomas Gleixner
2020-05-27 8:12 ` [tip: x86/entry] " tip-bot2 for Thomas Gleixner
2020-05-21 20:05 ` [patch V9 04/39] x86/entry: Provide idtentry_entry/exit_cond_rcu() Thomas Gleixner
2020-05-21 21:06 ` Paul E. McKenney
2020-05-26 8:23 ` Ingo Molnar
2020-05-26 8:58 ` Thomas Gleixner
2020-05-21 20:05 ` [patch V9 05/39] x86/entry: Provide idtentry_enter/exit_user() Thomas Gleixner
2020-05-27 8:12 ` [tip: x86/entry] " tip-bot2 for Thomas Gleixner
2020-05-21 20:05 ` [patch V9 06/39] x86/idtentry: Switch to conditional RCU handling Thomas Gleixner
2020-05-27 8:11 ` [tip: x86/entry] " tip-bot2 for Thomas Gleixner
2020-05-21 20:05 ` [patch V9 07/39] x86/entry: Cleanup idtentry_enter/exit() leftovers Thomas Gleixner
2020-05-27 8:11 ` [tip: x86/entry] x86/entry: Clean up " tip-bot2 for Thomas Gleixner
2020-05-21 20:05 ` [patch V9 08/39] genirq: Provide irq_enter/exit_rcu() Thomas Gleixner
2020-05-27 8:11 ` [tip: x86/entry] " tip-bot2 for Thomas Gleixner
2020-05-21 20:05 ` [patch V9 09/39] genirq: Provide __irq_enter/exit_raw() Thomas Gleixner
2020-05-27 8:11 ` [tip: x86/entry] " tip-bot2 for Thomas Gleixner
2020-05-21 20:05 ` [patch V9 10/39] x86/entry: Provide helpers for execute on irqstack Thomas Gleixner
2020-05-27 8:11 ` [tip: x86/entry] x86/entry: Provide helpers for executing on the irqstack tip-bot2 for Thomas Gleixner
2020-06-05 17:18 ` [patch V9 10/39] x86/entry: Provide helpers for execute on irqstack Qian Cai
2020-06-05 17:36 ` Peter Zijlstra
2020-06-05 17:52 ` Qian Cai
2020-06-07 11:59 ` Thomas Gleixner
2020-06-07 18:27 ` Qian Cai
2020-06-08 16:01 ` Qian Cai
2020-06-08 22:20 ` Thomas Gleixner
2020-06-09 2:32 ` Qian Cai
2020-06-09 20:33 ` Thomas Gleixner
2020-06-09 20:50 ` Thomas Gleixner
2020-06-10 12:38 ` Qian Cai
2020-06-10 19:38 ` Thomas Gleixner
2020-06-13 13:55 ` Qian Cai
2020-06-13 14:03 ` Thomas Gleixner
2020-06-13 21:41 ` Qian Cai
2020-06-14 8:59 ` Thomas Gleixner
2020-05-21 20:05 ` [patch V9 11/39] x86/entry/64: Move do_softirq_own_stack() to C Thomas Gleixner
2020-05-27 8:11 ` [tip: x86/entry] " tip-bot2 for Thomas Gleixner
2020-05-21 20:05 ` [patch V9 12/39] x86/entry: Split out idtentry_exit_cond_resched() Thomas Gleixner
2020-05-27 8:11 ` [tip: x86/entry] " tip-bot2 for Thomas Gleixner
2020-05-21 20:05 ` [patch V9 13/39] x86/entry: Switch XEN/PV hypercall entry to IDTENTRY Thomas Gleixner
2020-05-22 18:32 ` [patch V9-1 " Thomas Gleixner
2020-05-26 7:44 ` Jürgen Groß
2020-05-27 8:11 ` [tip: x86/entry] " tip-bot2 for Thomas Gleixner
2020-05-21 20:05 ` [patch V9 14/39] x86/entry/64: Simplify idtentry_body Thomas Gleixner
2020-05-27 8:11 ` [tip: x86/entry] " tip-bot2 for Thomas Gleixner
2020-05-21 20:05 ` [patch V9 15/39] x86/entry: Switch page fault exception to IDTENTRY_RAW Thomas Gleixner
2020-05-27 8:11 ` [tip: x86/entry] " tip-bot2 for Thomas Gleixner
2020-05-21 20:05 ` [patch V9 16/39] x86/entry: Remove the transition leftovers Thomas Gleixner
2020-05-27 8:11 ` [tip: x86/entry] " tip-bot2 for Thomas Gleixner
2020-05-21 20:05 ` [patch V9 17/39] x86/entry: Change exit path of xen_failsafe_callback Thomas Gleixner
2020-05-27 8:11 ` [tip: x86/entry] " tip-bot2 for Thomas Gleixner
2020-05-21 20:05 ` [patch V9 18/39] x86/entry/64: Remove error_exit Thomas Gleixner
2020-05-27 8:11 ` [tip: x86/entry] x86/entry/64: Remove error_exit() tip-bot2 for Thomas Gleixner
2020-05-21 20:05 ` [patch V9 19/39] x86/entry/32: Remove common_exception Thomas Gleixner
2020-05-27 8:11 ` [tip: x86/entry] x86/entry/32: Remove common_exception() tip-bot2 for Thomas Gleixner
2020-05-21 20:05 ` [patch V9 20/39] x86/irq: Use generic irq_regs implementation Thomas Gleixner
2020-05-26 18:39 ` damian
2020-05-28 9:50 ` Thomas Gleixner
2020-05-28 20:20 ` damian
2020-05-27 8:11 ` [tip: x86/entry] " tip-bot2 for Thomas Gleixner
2020-05-21 20:05 ` [patch V9 21/39] x86/irq: Convey vector as argument and not in ptregs Thomas Gleixner
2020-05-22 19:34 ` Thomas Gleixner
2020-05-27 8:11 ` [tip: x86/entry] " tip-bot2 for Thomas Gleixner
2020-08-24 17:29 ` [patch V9 21/39] " Alexander Graf
2020-08-25 10:28 ` Thomas Gleixner
2020-08-25 23:17 ` Alexander Graf
2020-08-25 23:41 ` Andy Lutomirski
2020-08-26 0:04 ` Alexander Graf
2020-08-26 1:03 ` Brian Gerst
2020-08-26 0:55 ` Thomas Gleixner
2020-05-21 20:05 ` [patch V9 22/39] x86/irq: Rework handle_irq() for 64bit Thomas Gleixner
2020-05-27 8:11 ` [tip: x86/entry] x86/irq: Rework handle_irq() for 64-bit tip-bot2 for Thomas Gleixner
2020-05-21 20:05 ` [patch V9 23/39] x86/entry: Add IRQENTRY_IRQ macro Thomas Gleixner
2020-05-27 8:11 ` [tip: x86/entry] " tip-bot2 for Thomas Gleixner
2020-05-21 20:05 ` [patch V9 24/39] x86/entry: Use idtentry for interrupts Thomas Gleixner
2020-05-27 8:11 ` [tip: x86/entry] " tip-bot2 for Thomas Gleixner
2020-05-21 20:05 ` [patch V9 25/39] x86/entry: Provide IDTENTRY_SYSVEC Thomas Gleixner
2020-05-27 8:11 ` [tip: x86/entry] " tip-bot2 for Thomas Gleixner
2020-05-21 20:05 ` [patch V9 26/39] x86/entry: Convert APIC interrupts to IDTENTRY_SYSVEC Thomas Gleixner
2020-05-27 8:11 ` [tip: x86/entry] " tip-bot2 for Thomas Gleixner
2020-05-21 20:05 ` [patch V9 27/39] x86/entry: Convert SMP system vectors " Thomas Gleixner
2020-05-27 8:11 ` [tip: x86/entry] " tip-bot2 for Thomas Gleixner
2020-05-21 20:05 ` [patch V9 28/39] x86/entry: Convert various system vectors Thomas Gleixner
2020-05-27 8:11 ` [tip: x86/entry] " tip-bot2 for Thomas Gleixner
2020-05-21 20:05 ` [patch V9 29/39] x86/entry: Convert KVM vectors to IDTENTRY_SYSVEC* Thomas Gleixner
2020-05-27 8:11 ` [tip: x86/entry] " tip-bot2 for Thomas Gleixner
2020-05-21 20:05 ` [patch V9 30/39] x86/entry: Convert various hypervisor vectors to IDTENTRY_SYSVEC Thomas Gleixner
2020-05-26 9:29 ` Wei Liu
2020-05-27 1:46 ` Boqun Feng
2020-05-27 8:38 ` Wei Liu
2020-05-27 12:09 ` Wei Liu [this message]
2020-05-27 23:06 ` Boqun Feng
2020-05-27 12:30 ` Thomas Gleixner
2020-05-27 8:11 ` [tip: x86/entry] " tip-bot2 for Thomas Gleixner
2020-05-21 20:05 ` [patch V9 31/39] x86/entry: Convert XEN hypercall vector " Thomas Gleixner
2020-05-27 8:11 ` [tip: x86/entry] " tip-bot2 for Thomas Gleixner
2020-05-21 20:05 ` [patch V9 32/39] x86/entry: Convert reschedule interrupt to IDTENTRY_SYSVEC_SIMPLE Thomas Gleixner
2020-05-27 8:11 ` [tip: x86/entry] " tip-bot2 for Thomas Gleixner
2020-05-21 20:05 ` [patch V9 33/39] x86/entry: Remove the apic/BUILD interrupt leftovers Thomas Gleixner
2020-05-27 8:11 ` [tip: x86/entry] " tip-bot2 for Thomas Gleixner
2020-05-21 20:05 ` [patch V9 34/39] x86/entry/64: Remove IRQ stack switching ASM Thomas Gleixner
2020-05-27 8:11 ` [tip: x86/entry] " tip-bot2 for Thomas Gleixner
2020-05-21 20:05 ` [patch V9 35/39] x86/entry: Make enter_from_user_mode() static Thomas Gleixner
2020-05-27 8:11 ` [tip: x86/entry] " tip-bot2 for Thomas Gleixner
2020-05-21 20:05 ` [patch V9 36/39] x86/entry/32: Remove redundant irq disable code Thomas Gleixner
2020-05-27 8:11 ` [tip: x86/entry] " tip-bot2 for Thomas Gleixner
2020-05-21 20:05 ` [patch V9 37/39] x86/entry/64: Remove TRACE_IRQS_*_DEBUG Thomas Gleixner
2020-05-27 8:11 ` [tip: x86/entry] " tip-bot2 for Thomas Gleixner
2020-05-21 20:05 ` [patch V9 38/39] x86/entry: Move paranoid irq tracing out of ASM code Thomas Gleixner
2020-05-27 8:11 ` [tip: x86/entry] " tip-bot2 for Thomas Gleixner
2020-05-21 20:05 ` [patch V9 39/39] x86/entry: Remove the TRACE_IRQS cruft Thomas Gleixner
2020-05-27 8:11 ` [tip: x86/entry] " tip-bot2 for Thomas Gleixner
2020-05-22 7:20 ` [patch V9 00/39] x86/entry: Rework leftovers (was part V) Andrew Cooper
2020-05-22 21:17 ` Peter Zijlstra
2020-06-03 19:18 ` Andrew Cooper
2020-06-04 13:25 ` Peter Zijlstra
2020-06-04 13:29 ` Paolo Bonzini
2020-06-04 13:35 ` Peter Zijlstra
2020-06-04 15:42 ` Andy Lutomirski
2020-06-04 15:55 ` Peter Zijlstra
2020-05-22 14:26 ` Boris Ostrovsky
2020-05-22 17:47 ` Thomas Gleixner
2020-05-22 18:08 ` Thomas Gleixner
2020-05-26 4:33 ` Andy Lutomirski
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20200527120918.ly5vuhvxzqesdt6j@liuwe-devbox-debian-v2.j3c5onc20sse1dnehy4noqpfcg.zx.internal.cloudapp.net \
--to=wei.liu@kernel.org \
--cc=alexandre.chartre@oracle.com \
--cc=andrew.cooper3@citrix.com \
--cc=boqun.feng@gmail.com \
--cc=boris.ostrovsky@oracle.com \
--cc=brgerst@gmail.com \
--cc=frederic@kernel.org \
--cc=jason.cj.chen@intel.com \
--cc=jgross@suse.com \
--cc=joel@joelfernandes.org \
--cc=jpoimboe@redhat.com \
--cc=linux-kernel@vger.kernel.org \
--cc=luto@kernel.org \
--cc=mathieu.desnoyers@efficios.com \
--cc=mhiramat@kernel.org \
--cc=mikelley@microsoft.com \
--cc=paulmck@kernel.org \
--cc=pbonzini@redhat.com \
--cc=peterz@infradead.org \
--cc=pmladek@suse.com \
--cc=rostedt@goodmis.org \
--cc=sean.j.christopherson@intel.com \
--cc=tglx@linutronix.de \
--cc=thomas.lendacky@amd.com \
--cc=will@kernel.org \
--cc=x86@kernel.org \
--cc=yakui.zhao@intel.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).