Re: [Xen-devel] [PATCH] x86/setup: do not relocate below the end of current Xen image placement

[Andrew Cooper <andrew.cooper3@xxxxxxxxxx>]

On 27/11/17 15:41, Daniel Kiper wrote:
> If it is possible we would like to have the Xen image higher than the
> booloader put it and certainly do not overwrite the Xen code and data
> during copy/relocation. Otherwise the Xen may crash silently at boot.
>
> Signed-off-by: Daniel Kiper <daniel.kiper@xxxxxxxxxx>

Actually, there is a second related bug which I've only just got to the
bottom of, and haven't had time to fix yet.

(XEN) Bootloader: GRUB 2.02
(XEN) Command line: hvm_fep com1=115200,8n1 console=com1,vga
dom0_mem=2048M,max:2048M watchdog ucode=scan dom0_max_vcpus=8
crashkernel=192M,below=4G
(XEN) Xen image load base address: 0xaba00000
(XEN) Video information:
(XEN)  VGA is text mode 80x25, font 8x16
(XEN)  VBE/DDC methods: none; EDID transfer time: 0 seconds
(XEN)  EDID info not retrieved because no DDC retrieval method detected
(XEN) Disc information:
(XEN)  Found 1 MBR signatures
(XEN)  Found 1 EDD information structures
(XEN) Xen-e820 RAM map:
(XEN)  0000000000000000 - 000000000009bc00 (usable)
(XEN)  000000000009bc00 - 00000000000a0000 (reserved)
(XEN)  00000000000e0000 - 0000000000100000 (reserved)
(XEN)  0000000000100000 - 00000000ac209000 (usable)
(XEN)  00000000ac209000 - 00000000aeb99000 (reserved)
(XEN)  00000000aeb99000 - 00000000aeb9d000 (ACPI NVS)
(XEN)  00000000aeb9d000 - 00000000aecd1000 (reserved)
(XEN)  00000000aecd1000 - 00000000aecd4000 (ACPI NVS)
(XEN)  00000000aecd4000 - 00000000aecf5000 (reserved)
(XEN)  00000000aecf5000 - 00000000aecf6000 (ACPI NVS)
(XEN)  00000000aecf6000 - 00000000aed24000 (reserved)
(XEN)  00000000aed24000 - 00000000aef2f000 (ACPI NVS)
(XEN)  00000000aef2f000 - 00000000aefed000 (ACPI data)
(XEN)  00000000aefed000 - 00000000af000000 (usable)
(XEN)  00000000af000000 - 00000000b0000000 (reserved)
(XEN)  00000000f8000000 - 00000000fc000000 (reserved)
(XEN)  00000000fec00000 - 00000000fec01000 (reserved)
(XEN)  00000000fed19000 - 00000000fed1a000 (reserved)
(XEN)  00000000fed1c000 - 00000000fed20000 (reserved)
(XEN)  00000000fee00000 - 00000000fee01000 (reserved)
(XEN)  00000000ff400000 - 0000000100000000 (reserved)
(XEN)  0000000100000000 - 0000000850000000 (usable)
(XEN) Kdump: DISABLED (failed to reserve 192MB (196608kB) at 0xa0200000)
(XEN) ACPI: RSDP 000F0410, 0024 (r2 INTEL )

When booting with Grub2 capable of locating Xen at its preferred
location, the calculation for the kexec region fails, because the
current location of Xen isn't taken into account.

The end of the chosen kexec region (0xa0200000 + 0x0c000000) overlaps
with the bottom of the Xen image.

~Andrew

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