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From: Cam Macdonell <cam@cs.ualberta.ca>
To: "qemu-devel@nongnu.org Developers" <qemu-devel@nongnu.org>,
	Avi Kivity <avi@redhat.com>,
	"Michael S. Tsirkin" <mst@redhat.com>
Subject: [Qemu-devel] Unusual physical address when using 64-bit BAR
Date: Mon, 19 Apr 2010 10:41:39 -0600	[thread overview]
Message-ID: <y2u8286e4ee1004190941jfa473787z795d8a4dd1b295d5@mail.gmail.com> (raw)

Hi,

I'm trying to use a 64-bit BAR for my shared memory device.  In simply
changing the memory type in pci_register_bar() to
PCI_BASE_ADDRESS_MEM_TYPE_64 I get an unusual physical address for
that BAR (and my driver crashes in pci_ioremap).

from lspci:

00:04.0 RAM memory: Qumranet, Inc. Device 1110
        Subsystem: Qumranet, Inc. Device 1100
        Flags: fast devsel, IRQ 10
        Memory at f1020000 (32-bit, non-prefetchable) [size=1K]
        Memory at f1021000 (32-bit, non-prefetchable) [size=4K]
        Memory at c20000000000 (64-bit, non-prefetchable) [size=1024M]
        Capabilities: <access denied>
00: f4 1a 10 11 03 00 10 00 00 00 00 05 00 00 00 00
10: 00 00 02 f1 00 10 02 f1 04 00 00 00 00 c2 00 00
20: 00 00 00 00 00 00 00 00 00 00 00 00 f4 1a 00 11
30: 00 00 00 00 40 00 00 00 00 00 00 00 0b 01 00 00

with DEBUG_MEMREG, I see

kvm_unregister_memory_area:666 Unregistering memory region
c20000000000 (40000000)
kvm_destroy_phys_mem:649 slot 7 start c20000000000 len 0 flags 0
IVSHMEM: addr = 3221225472 size = 1073741824
kvm_register_phys_mem:605 memory: gpa: c200c0000000, size: 40000000,
uaddr: 7f6dd7ffe000, slot: 7, flags: 0
kvm_unregister_memory_area:666 Unregistering memory region
c200c0000000 (40000000)
kvm_destroy_phys_mem:649 slot 7 start c200c0000000 len 0 flags 0
IVSHMEM: addr = 0 size = 1073741824
kvm_register_phys_mem:605 memory: gpa: c20000000000, size: 40000000,
uaddr: 7f6dd7ffe000, slot: 7, flags: 0
kvm_unregister_memory_area:666 Unregistering memory region
c20000000000 (40000000)
kvm_destroy_phys_mem:649 slot 7 start c20000000000 len 0 flags 0
IVSHMEM: addr = 0 size = 1073741824
kvm_register_phys_mem:605 memory: gpa: ffffffff00000000, size:
40000000, uaddr: 7f6dd7ffe000, slot: 7, flags: 0
kvm_unregister_memory_area:666 Unregistering memory region
ffffffff00000000 (40000000)
kvm_destroy_phys_mem:649 slot 7 start ffffffff00000000 len 0 flags 0
IVSHMEM: addr = 0 size = 1073741824
kvm_register_phys_mem:605 memory: gpa: c20000000000, size: 40000000,
uaddr: 7f6dd7ffe000, slot: 7, flags: 0

(the IVSHMEM lines are my debug statements)

address sizes   : 40 bits physical, 48 bits virtual  (guest)
address sizes   : 38 bits physical, 48 bits virtual  (host)

Thanks,
Cam

             reply	other threads:[~2010-04-19 16:41 UTC|newest]

Thread overview: 21+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2010-04-19 16:41 Cam Macdonell [this message]
2010-06-11 17:31 ` [Qemu-devel] Re: Unusual physical address when using 64-bit BAR Cam Macdonell
2010-06-15 11:04   ` Avi Kivity
2010-06-24 21:51     ` Cam Macdonell
2010-06-27  8:39       ` Avi Kivity
2010-06-28 20:38         ` Cam Macdonell
2010-06-29  6:50           ` Avi Kivity
2010-06-29 17:48             ` Cam Macdonell
2010-06-30  3:29               ` Isaku Yamahata
2010-07-13 20:05                 ` Cam Macdonell
2010-07-13 20:41                   ` Isaku Yamahata
2010-07-13 22:48                     ` Cam Macdonell
2010-07-14  2:52                       ` Isaku Yamahata
2010-07-14 15:10                         ` Cam Macdonell
2010-07-20  9:52                           ` Isaku Yamahata
2010-07-21  3:31                             ` Michael S. Tsirkin
2010-07-21  3:49                               ` Isaku Yamahata
2010-08-24 16:52                                 ` Cam Macdonell
2010-08-25  2:21                                   ` Isaku Yamahata
2010-08-27 19:35                                     ` Cam Macdonell
2010-08-30  2:36                                       ` Isaku Yamahata

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