32-bit FreeBSD under 64-bit KVM
Hi all,
While I am able to run a 64-bit FreeBSD under a 64-bit KVM perfectly, I am having problems with running a 32-bit FreeBSD under the same KVM:
INIT: version 2.86 booting
INIT: PANIC: segmentation violation! sleeping for 30 seconds. pid 34 (init), uid 0: exited on signal 11
INIT: PANIC: segmentation violation! sleeping for 30 seconds.
INIT: PANIC: segmentation violation! sleeping for 30 seconds.
INIT: PANIC: segmentation violation! sleeping for 30 seconds.
INIT: PANIC: segmentation violation! sleeping for 30 seconds.
INIT: PANIC: segmentation violation! sleeping for 30 seconds.
INIT: PANIC: segmentation violation! sleeping for 30 seconds.
INIT: PANIC: segmentation violation! sleeping for 30 seconds.
Basically the kernel boots correctly, but then the userland fails to work. I am using KVM-15 on an AMD64 CPU.
I am able to run the same OS with -no-kvm, also I am able to run a 32-bit Linux under a 64-bit KVM. It seems the 32-bit support is at least not totally broken, though I haven't made extensive tests.
Does somebody is experiencing the same problems? Do you have a solution?
I will try to run the same guest under a 32-bit KVM, but I have to install a 32-bit distribution first.
Thanks,
Aurelien
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Quoted 16 lines · Aurelien Jarno
Hi all,
While I am able to run a 64-bit FreeBSD under a 64-bit KVM perfectly, I am having problems with running a 32-bit FreeBSD under the same KVM:
INIT: version 2.86 booting
INIT: PANIC: segmentation violation! sleeping for 30 seconds. pid 34 (init), uid 0: exited on signal 11
INIT: PANIC: segmentation violation! sleeping for 30 seconds.
INIT: PANIC: segmentation violation! sleeping for 30 seconds.
INIT: PANIC: segmentation violation! sleeping for 30 seconds.
INIT: PANIC: segmentation violation! sleeping for 30 seconds.
INIT: PANIC: segmentation violation! sleeping for 30 seconds.
INIT: PANIC: segmentation violation! sleeping for 30 seconds.
INIT: PANIC: segmentation violation! sleeping for 30 seconds.
Quoted 10 lines
Basically the kernel boots correctly, but then the userland fails to work. I am using KVM-15 on an AMD64 CPU.
I am able to run the same OS with -no-kvm, also I am able to run a 32-bit Linux under a 64-bit KVM. It seems the 32-bit support is at least not totally broken, though I haven't made extensive tests.
Does somebody is experiencing the same problems? Do you have a solution?
Can you try turning the '#undef AUDIT' to '#define AUDIT' in mmu.c? Also, change 'int dbg = 1' to 'int dbg = 0' in the same file. Note kvm will be very slower after this. dmesg will show any issues (issue a 'echo 9 > /proc/sysrq-trigger' to make sure all messages are shown)
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Quoted 24 lines · Avi Kivity
Quoted 23 lines · Aurelien Jarno
Hi all,
While I am able to run a 64-bit FreeBSD under a 64-bit KVM perfectly, I am having problems with running a 32-bit FreeBSD under the same KVM:
INIT: version 2.86 booting
INIT: PANIC: segmentation violation! sleeping for 30 seconds. pid 34 (init), uid 0: exited on signal 11
INIT: PANIC: segmentation violation! sleeping for 30 seconds.
INIT: PANIC: segmentation violation! sleeping for 30 seconds.
INIT: PANIC: segmentation violation! sleeping for 30 seconds.
INIT: PANIC: segmentation violation! sleeping for 30 seconds.
INIT: PANIC: segmentation violation! sleeping for 30 seconds.
INIT: PANIC: segmentation violation! sleeping for 30 seconds.
INIT: PANIC: segmentation violation! sleeping for 30 seconds.Basically the kernel boots correctly, but then the userland fails to work. I am using KVM-15 on an AMD64 CPU.
I am able to run the same OS with -no-kvm, also I am able to run a 32-bit Linux under a 64-bit KVM. It seems the 32-bit support is at least not totally broken, though I haven't made extensive tests.
Quoted 9 lines
Quoted 3 lines
Does somebody is experiencing the same problems? Do you have a solution?
Can you try turning the '#undef AUDIT' to '#define AUDIT' in
mmu.c? Also, change 'int dbg = 1' to 'int dbg = 0' in the same file. Note kvm will be very slower after this. dmesg will show any issues (issue a 'echo 9 >/proc/sysrq-trigger' to make sure all messages are shown)
Yep I confirm it is very slow, especially when your tty0 device is actually a serial port running at 9600 bauds!
I also got some problems, as it seems logging so much data slowed down the machine, including the emulated machine. The segmentation violation message disappeared, but the OS was like in an endless loop. So the problem _may_ be due to a race condition.
After a lot of tries, I found that I was able to get the segmentation violation by sending the kernel log to another machine. The full log is available on http://temp.aurel32.net/kvm-gnu_kfreebsd32.log.bz2. But I don't know what to look for in a such big log.
Bye,
Aurelien
Signature · 10 lines
.''`. Aurelien Jarno | GPG: 1024D/F1BCDB73 : :' : Debian developer | Electrical Engineer `. `' [email protected] | [email protected] `- people.debian.org/~aurel32 | www.aurel32.net ------------------------------------------------------------------------- Take Surveys. Earn Cash. Influence the Future of IT Join SourceForge.net's Techsay panel and you'll get the chance to share your opinions on IT & business topics through brief surveys-and earn cash http://www.techsay.com/default.php?page=join.php&p=sourceforge&CID=DEVDEV
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Quoted 15 lines · Aurelien Jarno
Quoted 6 lines
Can you try turning the '#undef AUDIT' to '#define AUDIT' in
mmu.c? Also, change 'int dbg = 1' to 'int dbg = 0' in the same file. Note kvm will be very slower after this. dmesg will show any issues (issue a 'echo 9 >/proc/sysrq-trigger' to make sure all messages are shown)Yep I confirm it is very slow, especially when your tty0 device is actually a serial port running at 9600 bauds!
I also got some problems, as it seems logging so much data slowed down the machine, including the emulated machine. The segmentation violation message disappeared, but the OS was like in an endless loop. So the problem _may_ be due to a race condition.
Quoted 5 lines
After a lot of tries, I found that I was able to get the segmentation violation by sending the kernel log to another machine. The full log is available on http://temp.aurel32.net/kvm-gnu_kfreebsd32.log.bz2. But I don't know what to look for in a such big log.
Are you sure you set 'dbg = 0'? There aren't supposed to be any logs, except if an error is found during audit (that's what the '#define AUDIT' is for).
Signature · 8 lines
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Quoted 21 lines · Avi Kivity
Quoted 14 lines · Aurelien Jarno
Quoted 6 lines
Can you try turning the '#undef AUDIT' to '#define AUDIT' in
mmu.c? Also, change 'int dbg = 1' to 'int dbg = 0' in the same file. Note kvm will be very slower after this. dmesg will show any issues (issue a 'echo 9 >/proc/sysrq-trigger' to make sure all messages are shown)Yep I confirm it is very slow, especially when your tty0 device is actually a serial port running at 9600 bauds!
I also got some problems, as it seems logging so much data slowed down the machine, including the emulated machine. The segmentation violation message disappeared, but the OS was like in an endless loop. So the problem _may_ be due to a race condition.
Quoted 5 lines
After a lot of tries, I found that I was able to get the segmentation violation by sending the kernel log to another machine. The full log is available on http://temp.aurel32.net/kvm-gnu_kfreebsd32.log.bz2. But I don't know what to look for in a such big log.
Quoted 4 lines
Are you sure you set 'dbg = 0'? There aren't supposed to be any logs, except if an error is found during audit (that's what the '#define AUDIT' is for).
Oh sorry, I did that wrong.
I have tried with dbg = = 0 and #define AUDIT, and it is indeed far less verbose.
However I experienced the same problem as with DEBUG, ie when the guest is running slower (in that case due to AUDIT), the problem get away and the guest is running correctly, but very slowly.
I guess it will be difficult to debug such a thing, so I think I will have to wait until another way to trigger the bug is found.
Anyway, thanks for your help.
Bye,
Aurelien
Signature · 10 lines
.''`. Aurelien Jarno | GPG: 1024D/F1BCDB73 : :' : Debian developer | Electrical Engineer `. `' [email protected] | [email protected] `- people.debian.org/~aurel32 | www.aurel32.net ------------------------------------------------------------------------- Take Surveys. Earn Cash. Influence the Future of IT Join SourceForge.net's Techsay panel and you'll get the chance to share your opinions on IT & business topics through brief surveys-and earn cash http://www.techsay.com/default.php?page=join.php&p=sourceforge&CID=DEVDEV
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Quoted 13 lines · Aurelien Jarno
Quoted 7 lines
Quoted 2 lines
Are you sure you set 'dbg = 0'? There aren't supposed to be any logs, except if an error is found during audit (that's what the '#define AUDIT' is for).
Oh sorry, I did that wrong.
I have tried with dbg = = 0 and #define AUDIT, and it is indeed far less verbose.
Quoted 7 lines
However I experienced the same problem as with DEBUG, ie when the guest is running slower (in that case due to AUDIT), the problem get away and the guest is running correctly, but very slowly.
I guess it will be difficult to debug such a thing, so I think I will have to wait until another way to trigger the bug is found.
It shouldn't say anything under audit unless something is wrong. Can you post your dmesg?
Signature · 8 lines
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Quoted 18 lines · Avi Kivity
Quoted 17 lines · Aurelien Jarno
Quoted 7 lines
Quoted 2 lines
Are you sure you set 'dbg = 0'? There aren't supposed to be any logs, except if an error is found during audit (that's what the '#define AUDIT' is for).
Oh sorry, I did that wrong.
I have tried with dbg = = 0 and #define AUDIT, and it is indeed far less verbose.
However I experienced the same problem as with DEBUG, ie when the guest is running slower (in that case due to AUDIT), the problem get away and the guest is running correctly, but very slowly.
Quoted 6 lines
Quoted 3 lines
I guess it will be difficult to debug such a thing, so I think I will have to wait until another way to trigger the bug is found.
It shouldn't say anything under audit unless something is wrong. Can you post your dmesg?
Yep. Here are what I get in my dmesg. The lines below are output when the kernel is started (just after the bootloader):
Mar 3 16:50:35 joule kernel: assertion failed /usr/local/src/kvm-15/kernel/mmu.c:722: (gpa & HPA_ERR_MASK) == 0 Mar 3 16:50:35 joule kernel: audit error: (pre page fault) levels 2 gva 444000 gpa ffffffffffffffff hpa ffffffffffffffff ent 3e369021 Mar 3 16:50:36 joule kernel: assertion failed /usr/local/src/kvm-15/kernel/mmu.c:722: (gpa & HPA_ERR_MASK) == 0 Mar 3 16:50:36 joule kernel: audit error: (post page fault (fixed)) levels 2 gva 444000 gpa ffffffffffffffff hpa ffffffffffffffff ent 3e369021
Then the kernel takes a huge time to boot, and at then end of the kernel boot, or maybe when trying to start init, the following lines are printed hundred thousand of time:
Mar 3 18:40:30 joule kernel: audit error: (pre page fault) levels 2 gva ffffffffbfbfe000 gpa 1e81e000 hpa 4749c000 ent 564ca825 Mar 3 18:40:30 joule kernel: audit error: (post page fault (fixed)) levels 2 gva ffffffffbfbfe000 gpa 1e81e000 hpa 4749c000 ent 564ca825
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.''`. Aurelien Jarno | GPG: 1024D/F1BCDB73 : :' : Debian developer | Electrical Engineer `. `' [email protected] | [email protected] `- people.debian.org/~aurel32 | www.aurel32.net ------------------------------------------------------------------------- Take Surveys. Earn Cash. Influence the Future of IT Join SourceForge.net's Techsay panel and you'll get the chance to share your opinions on IT & business topics through brief surveys-and earn cash http://www.techsay.com/default.php?page=join.php&p=sourceforge&CID=DEVDEV
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Quoted 9 lines · Aurelien Jarno
Yep. Here are what I get in my dmesg. The lines below are output when the kernel is started (just after the bootloader):
Mar 3 16:50:35 joule kernel: assertion failed /usr/local/src/kvm-15/kernel/mmu.c:722: (gpa & HPA_ERR_MASK) == 0 Mar 3 16:50:35 joule kernel: audit error: (pre page fault) levels 2 gva 444000 gpa ffffffffffffffff hpa ffffffffffffffff ent 3e369021 Mar 3 16:50:36 joule kernel: assertion failed /usr/local/src/kvm-15/kernel/mmu.c:722: (gpa & HPA_ERR_MASK) == 0 Mar 3 16:50:36 joule kernel: audit error: (post page fault (fixed)) levels 2 gva 444000 gpa ffffffffffffffff hpa ffffffffffffffff ent 3e369021
Quoted 6 lines
Then the kernel takes a huge time to boot, and at then end of the kernel boot, or maybe when trying to start init, the following lines are printed hundred thousand of time:
Mar 3 18:40:30 joule kernel: audit error: (pre page fault) levels 2 gva ffffffffbfbfe000 gpa 1e81e000 hpa 4749c000 ent 564ca825 Mar 3 18:40:30 joule kernel: audit error: (post page fault (fixed)) levels 2 gva ffffffffbfbfe000 gpa 1e81e000 hpa 4749c000 ent 564ca825
Okay, an mmu bug. Been a while since we've seen one.
Please post a URL for the .iso so I can take a look, along with exact instructions for reproducing the bug.
Signature · 8 lines
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Quoted 13 lines · Avi Kivity
Quoted 12 lines · Aurelien Jarno
Yep. Here are what I get in my dmesg. The lines below are output when the kernel is started (just after the bootloader):
Mar 3 16:50:35 joule kernel: assertion failed /usr/local/src/kvm-15/kernel/mmu.c:722: (gpa & HPA_ERR_MASK) == 0 Mar 3 16:50:35 joule kernel: audit error: (pre page fault) levels 2 gva 444000 gpa ffffffffffffffff hpa ffffffffffffffff ent 3e369021 Mar 3 16:50:36 joule kernel: assertion failed /usr/local/src/kvm-15/kernel/mmu.c:722: (gpa & HPA_ERR_MASK) == 0 Mar 3 16:50:36 joule kernel: audit error: (post page fault (fixed)) levels 2 gva 444000 gpa ffffffffffffffff hpa ffffffffffffffff ent 3e369021Then the kernel takes a huge time to boot, and at then end of the kernel boot, or maybe when trying to start init, the following lines are printed hundred thousand of time:
Quoted 8 lines
Quoted 3 lines
Mar 3 18:40:30 joule kernel: audit error: (pre page fault) levels 2 gva ffffffffbfbfe000 gpa 1e81e000 hpa 4749c000 ent 564ca825 Mar 3 18:40:30 joule kernel: audit error: (post page fault (fixed)) levels 2 gva ffffffffbfbfe000 gpa 1e81e000 hpa 4749c000 ent 564ca825Okay, an mmu bug. Been a while since we've seen one.
Please post a URL for the .iso so I can take a look, along with exact instructions for reproducing the bug.
I have put a qcow image on http://aurel32.free.fr . You have to bunzip2 the image and then run:
qemu-system-x86_64 -hda gnu_kfreebsd.qcow
Then wait for the system to boot and look at the boot process. The kernel should boot fine, but when INIT is started, you will get a "SEGMENTATION VIOLATION" from the kernel.
At least is what I observe here on two different computers, both with AMD CPU (Turion 64 X2 and Athlon 64 X2), for kvm versions 14 (maybe also before) through 16. Note also that the problem is not always reproducible if the system load is high (for example running cpuburn on both cores).
Thanks for your help.
Bye,
Aurelien
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.''`. Aurelien Jarno | GPG: 1024D/F1BCDB73 : :' : Debian developer | Electrical Engineer `. `' [email protected] | [email protected] `- people.debian.org/~aurel32 | www.aurel32.net ------------------------------------------------------------------------- Take Surveys. Earn Cash. Influence the Future of IT Join SourceForge.net's Techsay panel and you'll get the chance to share your opinions on IT & business topics through brief surveys-and earn cash http://www.techsay.com/default.php?page=join.php&p=sourceforge&CID=DEVDEV
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Quoted 14 lines · Aurelien Jarno
Quoted 4 lines
Okay, an mmu bug. Been a while since we've seen one.
Please post a URL for the .iso so I can take a look, along with exact instructions for reproducing the bug.
I have put a qcow image on http://aurel32.free.fr . You have to bunzip2 the image and then run:
qemu-system-x86_64 -hda gnu_kfreebsd.qcow
Then wait for the system to boot and look at the boot process. The kernel should boot fine, but when INIT is started, you will get a "SEGMENTATION VIOLATION" from the kernel.
Quoted 6 lines
At least is what I observe here on two different computers, both with AMD CPU (Turion 64 X2 and Athlon 64 X2), for kvm versions 14 (maybe also before) through 16. Note also that the problem is not always reproducible if the system load is high (for example running cpuburn on both cores).
The attached patch should fix it. If you're using the external module, you'll need to apply with 'patch -p3' in the kernel/ subdirectory.
Signature · 1 line
error compiling committee.c: too many arguments to function
commit 6ee9853b015f8807f497ffad39b142ddc1403aa9
Author: Avi Kivity <avi-atKUWr5tajBWk0Htik3J/[email protected]> Date: Thu Mar 8 17:13:32 2007 +0200
KVM: MMU: Fix guest writes to nonpae pde
KVM shadow page tables are always in pae mode, regardless of the guest setting. This means that a guest pde (mapping 4MB of memory) is mapped to two shadow pdes (mapping 2MB each).
When the guest writes to a pte or pde, we intercept the write and emulate it. We also remove any shadowed mappings corresponding to the write. Since the mmu did not account for the doubling in the number of pdes, it removed the wrong entry, resulting in a mismatch between shadow page tables and guest page tables, followed shortly by guest memory corruption.
This patch fixes the problem by detecting the special case of writing to a non-pae pde and adjusting the address and number of shadow pdes zapped accordingly.
drivers/kvm/mmu.c +33 -11
@@ -1093,22 +1093,40 @@ out:return r; } +static void mmu_pre_write_zap_pte (struct kvm_vcpu *vcpu, +struct kvm_mmu_page *page, +u64 *spte) +{ +u64 pte; +struct kvm_mmu_page *child; + + pte = *spte; +if (is_present_pte (pte)) { +if (page->role.level ==PT_PAGE_TABLE_LEVEL ) +rmap_remove (vcpu, spte); +else { + child =page_header (pte &PT64_BASE_ADDR_MASK ); +mmu_page_remove_parent_pte (vcpu, child, spte); + } + } + *spte =0 ; +} +void kvm_mmu_pre_write (struct kvm_vcpu *vcpu,gpa_t gpa,int bytes) {gfn_t gfn = gpa >>PAGE_SHIFT ;struct kvm_mmu_page *page; -struct kvm_mmu_page *child;struct hlist_node *node, *n;struct hlist_head *bucket;unsigned index;u64 *spte; -u64 pte;unsigned offset =offset_in_page (gpa);unsigned pte_size;unsigned page_offset;unsigned misaligned;int level;int flooded =0 ; +int npte;pgprintk ("%s: gpa %llx bytes %d\n" , __FUNCTION__, gpa, bytes);if (gfn == vcpu->last_pt_write_gfn) {
@@ -1144,22 +1162,26 @@ void kvm_mmu_pre_write(struct kvm_vcpu *vcpu, gpa_t gpa, int bytes) } page_offset = offset; level = page->role.level; + npte =1 ;if (page->role.glevels ==PT32_ROOT_LEVEL ) { page_offset <<=1 ;/* 32->64 */ +/* +* A 32-bit pde maps 4MB while the shadow pdes map +* only 2MB. So we need to double the offset again +* and zap two pdes instead of one. +*/ +if (level ==PT32_ROOT_LEVEL ) { + page_offset <<=1 ; + npte =2 ; + } page_offset &= ~PAGE_MASK ; } spte =__va (page->page_hpa); spte += page_offset /sizeof (*spte); - pte = *spte; -if (is_present_pte (pte)) { -if (level ==PT_PAGE_TABLE_LEVEL ) -rmap_remove (vcpu, spte); -else { - child =page_header (pte &PT64_BASE_ADDR_MASK ); -mmu_page_remove_parent_pte (vcpu, child, spte); - } +while (npte--) { +mmu_pre_write_zap_pte (vcpu, page, spte); + ++spte; } - *spte =0 ; } }
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Quoted 2 lines · Avi Kivity
The attached patch should fix it. If you're using the external module, you'll need to apply with 'patch -p3' in the
kernel/subdirectory.
Thanks a lot, with this patch it's works very well. It boots correctly, and everything seems to work correctly, even with high load. I will do more intensive tests later today.
Plain FreeBSD also works correctly.
I have also updated the status page on the wiki.
Thanks,
Aurelien
Signature · 10 lines
.''`. Aurelien Jarno | GPG: 1024D/F1BCDB73 : :' : Debian developer | Electrical Engineer `. `' [email protected] | [email protected] `- people.debian.org/~aurel32 | www.aurel32.net ------------------------------------------------------------------------- Take Surveys. Earn Cash. Influence the Future of IT Join SourceForge.net's Techsay panel and you'll get the chance to share your opinions on IT & business topics through brief surveys-and earn cash http://www.techsay.com/default.php?page=join.php&p=sourceforge&CID=DEVDEV
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Quoted 6 lines · Aurelien Jarno
Quoted 3 lines · Avi Kivity
The attached patch should fix it. If you're using the external module, you'll need to apply with 'patch -p3' in the
kernel/subdirectory.
Quoted 7 lines
Thanks a lot, with this patch it's works very well. It boots correctly, and everything seems to work correctly, even with high load. I will do more intensive tests later today.
Plain FreeBSD also works correctly.
Great. Thanks for the testing and reporting.
Quoted 2 lines
I have also updated the status page on the wiki.
Good to see the trophy collection growing :)
Signature · 8 lines
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Quoted 14 lines · Avi Kivity
Quoted 12 lines · Aurelien Jarno
Quoted 3 lines · Avi Kivity
The attached patch should fix it. If you're using the external module, you'll need to apply with 'patch -p3' in the
kernel/subdirectory.Thanks a lot, with this patch it's works very well. It boots correctly, and everything seems to work correctly, even with high load. I will do more intensive tests later today.
Plain FreeBSD also works correctly.
Quoted 8 lines
Great. Thanks for the testing and reporting.
Quoted 2 lines
I have also updated the status page on the wiki.
Good to see the trophy collection growing :)
FYI, this also fixed OpenBSD.
Signature · 10 lines
.''`. Aurelien Jarno | GPG: 1024D/F1BCDB73 : :' : Debian developer | Electrical Engineer `. `' [email protected] | [email protected] `- people.debian.org/~aurel32 | www.aurel32.net ------------------------------------------------------------------------- Take Surveys. Earn Cash. Influence the Future of IT Join SourceForge.net's Techsay panel and you'll get the chance to share your opinions on IT & business topics through brief surveys-and earn cash http://www.techsay.com/default.php?page=join.php&p=sourceforge&CID=DEVDEV