1: This issue just happened on 32bit dom0.(the xen VMM is 64bit).
i have test on [VMM: xen4.4 (64bit) dom0 kernel 3.10 (64bit)], this issue
can reproduce.
2: xen VMM e820 info:
(XEN) 0000000000000000 - 000000000009ac00 (usable)
.....................
(XEN) 0000000000100000 - 000000007df7f000 (usable)
.........................
(XEN) 0000000100000000 - 0000000880000000 (usable)
3: 32bit dom0 get host e820 info by XENMEM_machine_memory_map
[ 0.000000] Xen: 0000000000000000 - 000000000009a000 (usable
......
[ 0.000000] Xen: 0000000000100000 - 000000007df7f000 (usable)
.....
so the dom0 last_pfn = 0x7df7f
domo info:
[root@devserver-173 ~]# xl info | grep xen_commandline
xen_commandline : mem=1024G lowmem_emergency_pool=1M
crashkernel=64M@32M loglvl=all guest_loglvl=all dom0_mem=3072M,max:3072M
[root@devserver-173 ~]# free
total used free shared buffers cached
Mem: 1960848 240108 1720740 0 8268 88812
-/+ buffers/cache: 143028 1817820
Swap: 2096476 0 2096476
My Debug:
using the XENMEM_memory_map to get pseudo-e820 map on dom0, the dom0 mem can
work correctly.
but the dom0 console is blank.
------------------ Original ------------------
From: "Konrad Rzeszutek Wilk";<konrad.w...@oracle.com>;
Date: Wed, Apr 15, 2015 09:13 PM
To: "????"<33186...@qq.com>;
Cc: "xs-devel"<xs-de...@lists.xenserver.org>;
"xen-devel"<xen-devel@lists.xen.org>;
Subject: Re: [Xen-devel] [xen-devel] Q:xen/dom0: Use host E820 map
On Wed, Apr 15, 2015 at 03:46:37PM +0800, ???? wrote:
> Hi ALL,
>
>
> Environment
> VMM: Xen-4.1.6.1
> dom0: 3.0.101
3.0? Whoa. Yes you will hit issues with that. Please upgrade
to latest kernels.
>
>
> Quesition:
> Set dom0 mem using the kernel cmdline: dom0_mem=3072M,max:3072M, after
> booting, the dom0 mem is 1914M.
> the others (3072M-1914M) has returned to xen vmm. maybe it is the e820 hole
> issue.
>
>
> can you help me to fix this issue.
>
>
> Thanks a lot
>
>
>
>
>
> pls,
> dom0 e820 Info:
> ...
> [ 0.000000] BIOS-provided physical RAM map:
> [ 0.000000] Xen: 0000000000000000 - 000000000009a000 (usable)
> [ 0.000000] Xen: 000000000009ac00 - 0000000000100000 (reserved)
> [ 0.000000] Xen: 0000000000100000 - 000000007df7f000 (usable)
> [ 0.000000] Xen: 000000007df7f000 - 000000007e0f7000 (reserved)
> [ 0.000000] Xen: 000000007e0f7000 - 000000007e2f0000 (ACPI NVS)
> [ 0.000000] Xen: 000000007e2f0000 - 000000007f36b000 (reserved)
> [ 0.000000] Xen: 000000007f36b000 - 000000007f800000 (ACPI NVS)
> [ 0.000000] Xen: 0000000080000000 - 0000000090000000 (reserved)
> [ 0.000000] Xen: 00000000fec00000 - 00000000fec02000 (reserved)
> [ 0.000000] Xen: 00000000fec40000 - 00000000fec41000 (reserved)
> [ 0.000000] Xen: 00000000fed1c000 - 00000000fed40000 (reserved)
> [ 0.000000] Xen: 00000000fee00000 - 00000000fee01000 (reserved)
> [ 0.000000] Xen: 00000000ff000000 - 0000000100000000 (reserved)
> [ 0.000000] Notice: NX (Execute Disable) protection missing in CPU!
> [ 0.000000] SMBIOS 2.7 present.
> [ 0.000000] DMI: Supermicro X9DRL-3F/iF/X9DRL-3F/iF, BIOS 3.0a 08/08/2013
> [ 0.000000] e820 update range: 0000000000000000 - 0000000000010000
> (usable) ==> (reserved)
> [ 0.000000] e820 remove range: 00000000000a0000 - 0000000000100000 (usable)
> [ 0.000000] last_pfn = 0x7df7f max_arch_pfn = 0x1000000
>
>
>
>
>
> XEN e820 Info:
> (XEN) Xen-e820 RAM map:
> (XEN) 0000000000000000 - 000000000009ac00 (usable)
> (XEN) 000000000009ac00 - 00000000000a0000 (reserved)
> (XEN) 00000000000e0000 - 0000000000100000 (reserved)
> (XEN) 0000000000100000 - 000000007df7f000 (usable)
> (XEN) 000000007df7f000 - 000000007e0f7000 (reserved)
> (XEN) 000000007e0f7000 - 000000007e2f0000 (ACPI NVS)
> (XEN) 000000007e2f0000 - 000000007f36b000 (reserved)
> (XEN) 000000007f36b000 - 000000007f800000 (ACPI NVS)
> (XEN) 0000000080000000 - 0000000090000000 (reserved)
> (XEN) 00000000fed1c000 - 00000000fed40000 (reserved)
> (XEN) 00000000ff000000 - 0000000100000000 (reserved)
> (XEN) 0000000100000000 - 0000000880000000 (usable)
> (XEN) Kdump: 64MB (65536kB) at 0x2000000
> (XEN) ACPI: RSDP 000F04A0, 0024 (r2 ALASKA)
> (XEN) ACPI: XSDT 7E208088, 008C (r1 ALASKA A M I 1072009 AMI 10013)
> (XEN) ACPI: FACP 7E214EA0, 010C (r5 ALASKA A M I 1072009 AMI 10013)
> (XEN) ACPI Warning (tbfadt-0232): FADT (revision 5) is longer than ACPI 2.0
> version, truncating length 0x10C to 0xF4 [20070126]
> (XEN) ACPI: DSDT 7E2081A8, CCF8 (r2 ALASKA A M I 15 INTL 20051117)
> (XEN) ACPI: FACS 7E2E7080, 0040
> (XEN) ACPI: APIC 7E214FB0, 00D4 (r3 ALASKA A M I 1072009 AMI 10013)
> (XEN) ACPI: FPDT 7E215088, 0044 (r1 ALASKA A M I 1072009 AMI 10013)
> (XEN) ACPI: MCFG 7E2150D0, 003C (r1 ALASKA OEMMCFG. 1072009 MSFT 97)
> (XEN) ACPI: SRAT 7E215110, 0330 (r1 A M I AMI SRAT 1 AMI. 0)
> (XEN) ACPI: SLIT 7E215440, 0030 (r1 A M I AMI SLIT 0 AMI. 0)
> (XEN) ACPI: SPMI 7E215470, 0040 (r5 A M I OEMSPMI 0 AMI. 0)
> (XEN) ACPI: SSDT 7E2154B0, D0CB0 (r2 INTEL CpuPm 4000 INTL 20051117)
> (XEN) ACPI: EINJ 7E2E6160, 0130 (r1 AMI AMI EINJ 0 0)
> (XEN) ACPI: ERST 7E2E6290, 0230 (r1 AMIER AMI ERST 0 0)
> (XEN) ACPI: HEST 7E2E64C0, 00A8 (r1 AMI AMI HEST 0 0)
> (XEN) ACPI: BERT 7E2E6568, 0030 (r1 AMI AMI BERT 0 0)
> (XEN) ACPI: DMAR 7E2E6598, 0120 (r1 A M I OEMDMAR 1 INTL 1)
> (XEN) System RAM: 32735MB (33520740kB)
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