From: Andriy Gapon <avg@FreeBSD.org>
To: Paolo Bonzini <pbonzini@redhat.com>
Cc: "Andreas Färber" <afaerber@suse.de>,
"Gleb Natapov" <gleb@redhat.com>,
qemu-devel@nongnu.org
Subject: Re: [Qemu-devel] in_asm substitute for accel=kvm:tcg
Date: Thu, 19 Sep 2013 20:49:51 +0300 [thread overview]
Message-ID: <523B393F.10203@FreeBSD.org> (raw)
In-Reply-To: <523B2C06.3060309@redhat.com>
on 19/09/2013 19:53 Paolo Bonzini said the following:
> Il 19/09/2013 16:36, Andriy Gapon ha scritto:
>> Not sure how the code ends up at 0x9315 after that.
>
> Events are dropped, probably corresponding to more emulation.
I've got a trace without dropped events between the last "normal" instruction
and the loop (and also including a snippet where the same code is executed
without a problem):
...
qemu-system-x86-12024 [003] 278157.048876: kvm_emulate_insn: 0:9366:b1 10
(prot32)
qemu-system-x86-12024 [003] 278157.048877: kvm_entry: vcpu 0
qemu-system-x86-12024 [003] 278157.048878: kvm_emulate_insn: 0:9368:8e d1
(prot32)
qemu-system-x86-12024 [003] 278157.048880: kvm_entry: vcpu 0
qemu-system-x86-12024 [003] 278157.048882: kvm_exit: reason
CR_ACCESS rip 0x9312 info 0 0
qemu-system-x86-12024 [003] 278157.048883: kvm_cr: cr_write 0 = 0x10
qemu-system-x86-12024 [003] 278157.048885: kvm_entry: vcpu 0
qemu-system-x86-12024 [003] 278157.048886: kvm_emulate_insn: 0:9315:ea 1a
93 00 00 (real)
qemu-system-x86-12024 [003] 278157.048887: kvm_entry: vcpu 0
qemu-system-x86-12024 [003] 278157.048888: kvm_emulate_insn: 0:931a:31 c0
(real)
... ...
qemu-system-x86-12024 [003] 278157.048990: kvm_set_irq: gsi 4 level 0
source 0
qemu-system-x86-12024 [003] 278157.048991: kvm_pic_set_irq: chip 0 pin 4
(edge|masked)
qemu-system-x86-12024 [003] 278157.048992: kvm_ioapic_set_irq: pin 4 dst 0
vec=0 (Fixed|physical|edge|masked)
qemu-system-x86-12024 [003] 278157.049001: kvm_entry: vcpu 0
qemu-system-x86-12024 [003] 278157.049002: kvm_exit: reason
IO_INSTRUCTION rip 0x1e675 info 3fd0008 0
qemu-system-x86-12024 [003] 278157.049005: kvm_emulate_insn: a000:1e675:ec
(prot32)
qemu-system-x86-12024 [003] 278157.049005: kvm_pio: pio_read at
0x3fd size 1 count 1
qemu-system-x86-12024 [003] 278157.049006: kvm_userspace_exit: reason
KVM_EXIT_IO (2)
qemu-system-x86-12024 [003] 278157.049024: kvm_entry: vcpu 0
qemu-system-x86-12024 [003] 278157.049027: kvm_exit: reason
CR_ACCESS rip 0x9312 info 0 0
qemu-system-x86-12024 [003] 278157.049028: kvm_cr: cr_write 0 = 0x10
qemu-system-x86-12024 [003] 278157.049030: kvm_entry: vcpu 0
qemu-system-x86-12024 [003] 278157.049031: kvm_emulate_insn: 0:9315: (real)
qemu-system-x86-12024 [003] 278157.049033: kvm_emulate_insn: 0:9315: (real)
qemu-system-x86-12024 [003] 278157.049034: kvm_emulate_insn: 0:9315: (real)
...
It's strange that no instruction gets reported in those repeating "0:9315:
(real)" lines. It's like kvm is somehow losing track of what should be executed
and just loops over the same ip without actually doing anything.
--
Andriy Gapon
next prev parent reply other threads:[~2013-09-19 17:51 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-09-17 11:37 [Qemu-devel] in_asm substitute for accel=kvm:tcg Andriy Gapon
2013-09-17 12:32 ` Andreas Färber
2013-09-17 14:33 ` Andriy Gapon
2013-09-17 18:49 ` Gleb Natapov
2013-09-19 14:36 ` Andriy Gapon
2013-09-19 16:53 ` Paolo Bonzini
2013-09-19 17:18 ` Andriy Gapon
2013-09-19 17:26 ` Paolo Bonzini
2013-09-19 18:05 ` Andriy Gapon
2013-09-19 17:49 ` Andriy Gapon [this message]
2013-09-22 6:31 ` Gleb Natapov
2013-09-22 8:05 ` Andriy Gapon
2013-09-22 8:17 ` Gleb Natapov
2013-09-22 9:41 ` Andriy Gapon
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