[Xen-devel] Xen 4.12.0 Dom0=pvh mode EFI variables 'not supported' after boot

[PGNet Dev <pgnet.dev@xxxxxxxxx>]

ref: from chat in #xen

        [08:53] <royger> pgnd: would be good to send an email so we can keep 
track of this in a more formal way.

I've got Xen PV Dom0 booted on a Linux UEFI box

        dmesg | grep -i "xen version"
                [    1.185996] Xen version: 4.12.0_09-lp150.640 (preserve-AD)

        uname -rm
                5.0.7-lp150.5.g012b5f1-default x86_64

        lsb_release -rd
                Description:    openSUSE Leap 15.0
                Release:        15.0

        rpm -qa | grep -i qemu | egrep "seabios|u-3"
                qemu-seabios-1.12.0-lp150.513.13.noarch
                qemu-3.1.0-lp150.513.13.x86_64

        rpm -qa | grep -i ovmf
                ovmf-tools-2019+git1552059899.89910a39dcfd-lp150.100.3.x86_64
                
qemu-ovmf-x86_64-2019+git1552059899.89910a39dcfd-lp150.100.3.noarch
                ovmf-2019+git1552059899.89910a39dcfd-lp150.100.3.x86_64

        rpm -qa | grep grub2 |egrep "xen|efi"
                grub2-x86_64-efi-2.02-lp150.64.10.noarch
                grub2-x86_64-xen-2.02-lp150.64.10.noarch
&

        rpm -qa | grep -i efi | grep git | sort
                efibootmgr-999.git.20190306.438ba96-lp150.7.22.x86_64
                efivar-devel-999.git.20190305.836461e-lp150.6.21.x86_64
                libefivar1-999.git.20190305.836461e-lp150.6.21.x86_64

note these^^ EFI* tools -- src from efi master branch, pkgs available here,

        https://build.opensuse.org/package/show/home:pgnd:Kernel:stable/efivar
        
https://build.opensuse.org/package/show/home:pgnd:Kernel:stable/efibootmgr

-- were needed, as distro packaged versions' were old/problematic ...

With this^^ config, all's well

        serial boot log
                ...
                [    0.000000] efi: EFI v2.31 by American Megatrends
                [    0.000000] efi:  ESRT=0x9ef8d998  ACPI 2.0=0x9e819000  
ACPI=0x9e819000  SMBIOS=0xf04c0  MPS=0xfd490
                [    0.000000] SMBIOS 2.7 present.
                [    0.000000] Hypervisor detected: Xen PV
                [    0.000000] Xen version 4.12.
                ...

at shell prompt,

        xl list
                Name                                        ID   Mem VCPUs      
State   Time(s)
                Domain-0                                     0  4016     4     
r-----    5949.6
                Xenstore                                     1    31     1     
-b----       0.2

        efibootmgr -v
                BootCurrent: 0000
                Timeout: 1 seconds
                BootOrder: 0000
                Boot0000* openSUSE-pgnXEN 
HD(2,GPT,98026223-f11d-3c68-8d30-3f9856c8c21e,0x1000,0x96000)/File(\EFI\opensuse\grubx64.efi)
                      dp: 04 01 2a ... 04 00

enabling PVH Dom0, adding to grub configs,

        GRUB_CMDLINE_LINUX_XEN_REPLACE="... intel_iommu=on ..."
        GRUB_CMDLINE_XEN="... dom0=pvh dom0-iommu=map-reserved ..."

then mkinitrd & grub reconfig,

        serial boot log
                Xen 4.12.0_09-lp150.640 (c/s ) EFI loader
                ...
                (XEN) [00000027dcded44e] Bootloader: EFI
                ...
                Using configuration file 'xen-4.12.0_09-lp150.640.cfg'
                ...
                [    0.000000] BIOS-e820: [mem 
0x0000000100000000-0x000000016a2acfff] usable
                [    0.000000] BIOS-e820: [mem 
0x000000016a2ad000-0x000000085dffffff] unusable
                [    0.000000] NX (Execute Disable) protection: active
                [    0.000000] SMBIOS 2.7 present.
                [    0.000000] Hypervisor detected: Xen HVM
                [    0.000000] Xen version 4.12.
                ...

Note, there is NO "efi: ..." log content, as in the prior, PV mode example.

at shell prompt,

        xl list
                Name                                        ID   Mem VCPUs      
State   Time(s)
                Domain-0                                     0  4015     4     
r-----     563.0
                Xenstore                                     1    31     1     
-b----       0.0

but, in this Dom0=pvh mode,

        efibootmgr -v
                EFI variables are not supported on this system.

checking

        mount | grep -i efi
                systemd-1 on /boot/efi type autofs 
(rw,relatime,fd=54,pgrp=1,timeout=0,minproto=5,maxproto=5,direct,pipe_ino=21340)
                /dev/sde2 on /boot/efi type vfat 
(rw,relatime,fmask=0002,dmask=0002,allow_utime=0020,codepage=437,iocharset=iso8859-1,shortname=mixed,utf8,errors=remount-ro,x-systemd.automount)

        tree /boot/efi/
                /boot/efi/
                ├── [root            4096]  EFI
                │   ├── [root            4096]  BOOT
                │   │   └── [root          142848]  BOOTX64.EFI
                │   └── [root            4096]  opensuse
                │       ├── [root          142848]  grubx64.efi
                │       ├── [root             532]  grub.xen-files
                │       ├── [root        18318448]  
initrd-5.0.7-lp150.5.g012b5f1-default
                │       ├── [root         8199608]  
vmlinuz-5.0.7-lp150.5.g012b5f1-default
                │       ├── [root            4924]  xen-4.12.0_09-lp150.640.cfg
                │       └── [root         2735560]  xen-4.12.0_09-lp150.640.efi
                └── [root              30]  startup.nsh


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