linux-kernel - Re: KVM overflows the stack

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Message-Id: <1216276049.11664.16.camel@nimitz>
Date:	Wed, 16 Jul 2008 23:27:29 -0700
From:	Dave Hansen <dave@...ux.vnet.ibm.com>
To:	Avi Kivity <avi@...ranet.com>
Cc:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	kvm-devel <kvm@...r.kernel.org>,
	"Anthony N. Liguori [imap]" <aliguori@...ibm.com>
Subject: Re: KVM overflows the stack

A newer gcc (4.2) makes this a wee bit better, but probably still
worrisome.

dave@...itz:~/src/kvm-userspace-virgin/kernel$ objdump -d *.ko | perl /home/dave/kernels/linux-2.6.git-t61/scripts/checkstack.pl i386
0x00007b33 kvm_arch_vm_ioctl [kvm]:			1164
0x000072e8 kvm_arch_vcpu_ioctl [kvm]:			1060
0x00007497 kvm_arch_vcpu_ioctl [kvm]:			1060
0x0000adad kvm_pv_mmu_op [kvm]:				564
0x0000ae6b kvm_pv_mmu_op [kvm]:				564
0x00002553 kvm_vcpu_ioctl [kvm]:			468
0x0000d7e8 paging64_prefetch_page [kvm]:		304
0x0000d926 paging64_prefetch_page [kvm]:		304
0x0000d936 paging64_prefetch_page [kvm]:		304
0x0000c118 paging32_prefetch_page [kvm]:		300
0x0000c146 paging32_prefetch_page [kvm]:		300
0x0000c286 paging32_prefetch_page [kvm]:		300
0x0000f1eb x86_emulate_insn [kvm]:			192
0x0000f372 x86_emulate_insn [kvm]:			192
0x0000f5f2 x86_emulate_insn [kvm]:			192
0x00005373 kvm_task_switch [kvm]:			172
0x00001466 __kvm_set_memory_region [kvm]:		164
0x000014da __kvm_set_memory_region [kvm]:		164
0x0000dae8 paging64_page_fault [kvm]:			156
0x0000db06 paging64_page_fault [kvm]:			156
0x0000db67 paging64_page_fault [kvm]:			156
0x0000dcd5 paging64_page_fault [kvm]:			156
0x0000dcf1 paging64_page_fault [kvm]:			156
0x0000c356 kvm_mmu_pte_write [kvm]:			152
0x0000c50a kvm_mmu_pte_write [kvm]:			152
0x0000df28 paging32_page_fault [kvm]:			144
0x0000df46 paging32_page_fault [kvm]:			144
0x0000dfa7 paging32_page_fault [kvm]:			144
0x0000e115 paging32_page_fault [kvm]:			144
0x0000e131 paging32_page_fault [kvm]:			144
0x00014ed3 apic_mmio_read [kvm]:			108

-- Dave

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