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Re: [Xen-devel] pvops dom0 work roadmap

To: Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>

From: Jeremy Fitzhardinge <jeremy@xxxxxxxx>

Date: Wed, 19 Aug 2009 12:06:09 -0700

Cc: Xen-devel <xen-devel@xxxxxxxxxxxxxxxxxxx>, Gianluca Guida <gianluca.guida@xxxxxxxxxx>

Delivery-date: Wed, 19 Aug 2009 12:06:34 -0700

List-id: Xen developer discussion <xen-devel.lists.xensource.com>

On 08/19/09 10:45, Konrad Rzeszutek Wilk wrote: > I will retry this, but in the meantime I am tracking balloon accessing > non-existent pages: > Gianluca mentioned something about this to me. I think he's looking into it. J > <BEGIN> > [ 0.239963] xen_balloon: Initialising balloon driver. > [ 0.240057] xen_ballon: 131072 -> 1245184 <-- added a printk. > [ 0.257938] BUG: unable to handle kernel [ 0.257938] BUG: unable to > handle kernel paging requestpaging request at ffffea0002d80028 > at ffffea0002d80028 > [ 0.257960] IP:[ 0.257960] IP: [<ffffffff81215f7b>] > balloon_append+0x13/0x36 > [<ffffffff81215f7b>] balloon_append+0x13/0x36 > [ 0.257960] PGD 10402067 [ 0.257960] PGD 10402067 PUD 10403067 PUD > 10403067 PMD 1301a067 PMD 1301a067 PTE 0PTE 0 > > [ 0.257960] Oops: 0002 [#1] [ 0.257960] Oops: 0002 [#1] SMP SMP > > [ 0.257960] last sysfs file: > [ 0.257960] last sysfs file: > [ 0.257960] CPU 0 [ 0.257960] CPU 0 > > [ 0.257960] Modules linked in:[ 0.257960] Modules linked in: > > [ 0.257960] Pid: 1, comm: swapper Not tainted > 2.6.31-rc5-xen0-23866-g8584ce8-dirty #6 . > [ 0.257960] Pid: 1, comm: swapper Not tainted > 2.6.31-rc5-xen0-23866-g8584ce8-dirty #6 . > [ 0.257960] RIP: e030:[<ffffffff81215f7b>] [ 0.257960] RIP: > e030:[<ffffffff81215f7b>] [<ffffffff81215f7b>] balloon_append+0x13/0x36 > [<ffffffff81215f7b>] balloon_append+0x13/0x36 > [ 0.257960] RSP: e02b:ffff88001fc81e70 EFLAGS: 00010282 > [ 0.257960] RSP: e02b:ffff88001fc81e70 EFLAGS: 00010282 > [ 0.257960] RAX: ffffea0002d80028 RBX: 00000000000d0001 RCX: > 0000000000000064 > [ 0.257960] RAX: ffffea0002d80028 RBX: 00000000000d0001 RCX: > 0000000000000064 > [ 0.257960] RDX: ffffea0002d7fff0 RSI: ffffffff810000df RDI: > ffffea0002d80000 > [ 0.257960] RDX: ffffea0002d7fff0 RSI: ffffffff810000df RDI: > ffffea0002d80000 > [ 0.257960] RBP: ffff88001fc81e70 R08: 0000000000000000 R09: > ffff88001fc38000 > [ 0.257960] RBP: ffff88001fc81e70 R08: 0000000000000000 R09: > ffff88001fc38000 > [ 0.257960] R10: ffff88001fc81c20 R11: ffff88001fc81da0 R12: > ffffea0002d80038 > [ 0.257960] R10: ffff88001fc81c20 R11: ffff88001fc81da0 R12: > ffffea0002d80038 > [ 0.257960] R13: ffffffff816e1907 R14: 0000000000000000 R15: > 0000000000000000 > [ 0.257960] R13: ffffffff816e1907 R14: 0000000000000000 R15: > 0000000000000000 > [ 0.257960] FS: 0000000000000000(0000) GS:ffffc90000000000(0000) > knlGS:0000000000000000 > [ 0.257960] FS: 0000000000000000(0000) GS:ffffc90000000000(0000) > knlGS:0000000000000000 > [ 0.257960] CS: e033 DS: 0000 ES: 0000 CR0: 000000008005003b > [ 0.257960] CS: e033 DS: 0000 ES: 0000 CR0: 000000008005003b > [ 0.257960] CR2: ffffea0002d80028 CR3: 0000000001001000 CR4: > 0000000000002660 > [ 0.257960] CR2: ffffea0002d80028 CR3: 0000000001001000 CR4: > 0000000000002660 > [ 0.257960] DR0: 0000000000000000 DR1: 0000000000000000 DR2: > 0000000000000000 > [ 0.257960] DR0: 0000000000000000 DR1: 0000000000000000 DR2: > 0000000000000000 > [ 0.257960] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: > 0000000000000400 > [ 0.257960] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: > 0000000000000400 > [ 0.257960] Process swapper (pid: 1, threadinfo ffff88001fc80000, task > ffff88001fc78000) > [ 0.257960] Process swapper (pid: 1, threadinfo ffff88001fc80000, task > ffff88001fc78000) > [ 0.257960] Stack: > [ 0.257960] Stack: > [ 0.257960] ffff88001fc81ea0[ 0.257960] ffff88001fc81ea0 > ffffffff816e1ad0 ffffffff816e1ad0 ffff88001fc81ea0 ffff88001fc81ea0 > ffffffff816e18ad ffffffff816e18ad > > [ 0.257960] <0>[ 0.257960] <0> ffffffff817167a8 ffffffff817167a8 > 0000000000000040 0000000000000040 ffff88001fc81f10 ffff88001fc81f10 > ffffffff8100a05c ffffffff8100a05c > > [ 0.257960] <0>[ 0.257960] <0> ffff88001fc81e00 ffff88001fc81e00 > ffffffff8108e691 ffffffff8108e691 0000000000003333 0000000000003333 > ffffffff81110000 ffffffff81110000 > > [ 0.257960] Call Trace: > [ 0.257960] Call Trace: > [ 0.257960] [<ffffffff816e1ad0>] balloon_init+0x1c9/0x1fd > [ 0.257960] [<ffffffff816e1ad0>] balloon_init+0x1c9/0x1fd > [ 0.257960] [<ffffffff816e18ad>] ? xenbus_probe_frontend_init+0x53/0x59 > [ 0.257960] [<ffffffff816e18ad>] ? xenbus_probe_frontend_init+0x53/0x59 > [ 0.257960] [<ffffffff8100a05c>] do_one_initcall+0x56/0x136 > [ 0.257960] [<ffffffff8100a05c>] do_one_initcall+0x56/0x136 > [ 0.257960] [<ffffffff8108e691>] ? register_irq_proc+0xae/0xca > [ 0.257960] [<ffffffff8108e691>] ? register_irq_proc+0xae/0xca > [ 0.257960] [<ffffffff81110000>] ? elf_core_dump+0x81e/0xc29 > [ 0.257960] [<ffffffff81110000>] ? elf_core_dump+0x81e/0xc29 > [ 0.257960] [<ffffffff816bc9aa>] kernel_init+0x15e/0x1b6 > [ 0.257960] [<ffffffff816bc9aa>] kernel_init+0x15e/0x1b6 > [ 0.257960] [<ffffffff81012cea>] child_rip+0xa/0x20 > [ 0.257960] [<ffffffff81012cea>] child_rip+0xa/0x20 > [ 0.257960] [<ffffffff81011ea7>] ? int_ret_from_sys_call+0x7/0x1b > [ 0.257960] [<ffffffff81011ea7>] ? int_ret_from_sys_call+0x7/0x1b > [ 0.257960] [<ffffffff8101265d>] ? retint_restore_args+0x5/0x6 > [ 0.257960] [<ffffffff8101265d>] ? retint_restore_args+0x5/0x6 > [ 0.257960] [<ffffffff81012ce0>] ? child_rip+0x0/0x20 > [ 0.257960] [<ffffffff81012ce0>] ? child_rip+0x0/0x20 > [ 0.257960] Code: [ 0.257960] Code: 55 55 89 89 ff ff 48 48 89 89 e5 e5 > e8 e8 25 25 32 32 df df ff ff c9 c9 c3 c3 55 55 48 48 89 89 e5 e5 e8 e8 5a 5a > 32 32 df df ff ff c9 c9 c3 c3 48 48 8b 8b 15 15 d1 d1 0c 0c 43 43 00 00 48 48 > 8d 8d 47 47 28 28 55 55 48 48 89 89 e5 e5 48 48 89 89 42 42 08 08 <48> <48> > 89 89 57 57 28 28 48 48 c7 c7 40 40 08 08 40 40 6c 6c 64 64 81 81 48 48 ff ff > 05 05 6a 6a ac ac 60 60 00 00 48 48 ff ff > > [ 0.257960] RIP [ 0.257960] RIP [<ffffffff81215f7b>] > balloon_append+0x13/0x36 > [<ffffffff81215f7b>] balloon_append+0x13/0x36 > [ 0.257960] RSP <ffff88001fc81e70> > [ 0.257960] RSP <ffff88001fc81e70> > [ 0.257960] CR2: ffffea0002d80028 > [ 0.257960] CR2: ffffea0002d80028 > [ 0.257960] ---[ end trace 4eaa2a86a8e2da22 ]--- > [ 0.257960] ---[ end trace 4eaa2a86a8e2da22 ]--- > <END> > > Sorry for the duplicate lines. I think the combination of earlycons and > console both pointing > to the Xen console driver is screwing this up. > > This could be a simple bug with the max_pfn being reset to phantom value: > > [ 0.000000] BIOS-provided physical RAM map: > [ 0.000000] Xen: 0000000000000000 - 000000000009f400 (usable) > [ 0.000000] Xen: 000000000009f400 - 0000000000100000 (reserved) > [ 0.000000] Xen: 0000000000100000 - 00000000cfee0000 (usable) > [ 0.000000] Xen: 00000000cfee0000 - 00000000cfee3000 (ACPI NVS) > [ 0.000000] Xen: 00000000cfee3000 - 00000000cfef0000 (ACPI data) > [ 0.000000] Xen: 00000000cfef0000 - 00000000cff00000 (reserved) > [ 0.000000] Xen: 00000000e0000000 - 00000000f0000000 (reserved) > [ 0.000000] Xen: 00000000fec00000 - 0000000100000000 (reserved) > [ 0.000000] Xen: 0000000100000000 - 0000000130000000 (usable) > [ 0.000000] console [xenboot0] enabled > [ 0.000000] DMI 2.5 present. > [ 0.000000] Phoenix BIOS detected: BIOS may corrupt low RAM, working > around it. > [ 0.000000] e820 update range: 0000000000000000 - 0000000000010000 > (usable) ==> (reserved) > [ 0.000000] last_pfn = 0x130000 max_arch_pfn = 0x400000000 > [ 0.000000] max_pfn = 1245184 <-- Added a printk > [ 0.000000] num_physpages: 1245184 <-- Added a printk > [ 0.000000] Searching for max PFN under 4GB <-- Added a > printk > [ 0.000000] last_pfn = 0xcfee0 max_arch_pfn = 0x400000000 > [ 0.000000] max_low_pfn: 851680m <-- Added a printk > [ 0.000000] Scanning 0 areas for low memory corruption > [ 0.000000] modified physical RAM map: > [ 0.000000] modified: 0000000000000000 - 0000000000010000 (reserved) > [ 0.000000] modified: 0000000000010000 - 000000000009f400 (usable) > [ 0.000000] modified: 000000000009f400 - 0000000000100000 (reserved) > [ 0.000000] modified: 0000000000100000 - 00000000cfee0000 (usable) > [ 0.000000] modified: 00000000cfee0000 - 00000000cfee3000 (ACPI NVS) > [ 0.000000] modified: 00000000cfee3000 - 00000000cfef0000 (ACPI data) > [ 0.000000] modified: 00000000cfef0000 - 00000000cff00000 (reserved) > [ 0.000000] modified: 00000000e0000000 - 00000000f0000000 (reserved) > [ 0.000000] modified: 00000000fec00000 - 0000000100000000 (reserved) > [ 0.000000] modified: 0000000100000000 - 0000000130000000 (usable) > [ 0.000000] initial memory mapped : 0 - 20000000 > > The machine has 4GB, but somehow the max_pfn is set to point to 5.1GB which is > surely not right. Oh, I am compiling a 64-bit Linux and Xen. > > _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-devel

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