Re: Windows 10 Inaccessible Boot device starting 5.2.0-rc0

[Michael S. Tsirkin]

Can you try this please:

  git://git.kernel.org/pub/scm/virt/kvm/mst/qemu.git tags/for_upstream

?


On Tue, Mar 02, 2021 at 09:59:47PM -0800, Nick S wrote:
> I found the commit that breaks my VM. Anybody has any background on why it was
> done? The comments are fairly extensive, but they are Mac related and I am
> running Windows 10 with UEFI.  My VM is pc-q35-4.2 and this change definitely
> breaks Windows 10. Anything before I can check out, compile and it runs fine.
> Anything after this commit and it produces that boot device inaccessible 
> error.
> Reverting this change on the current master also makes it work fine.
> 
> git diff af1b80ae56c9495999e8ccf7b70ef894378de642~
> af1b80ae56c9495999e8ccf7b70ef894378de642
> diff --git a/hw/i386/acpi-build.c b/hw/i386/acpi-build.c
> index b7bcbbbb2a..7a5a8b3521 100644
> --- a/hw/i386/acpi-build.c
> +++ b/hw/i386/acpi-build.c
> @@ -1497,7 +1497,7 @@ build_dsdt(GArray *table_data, BIOSLinker *linker,
>          dev = aml_device("PCI0");
>          aml_append(dev, aml_name_decl("_HID", aml_eisaid("PNP0A03")));
>          aml_append(dev, aml_name_decl("_ADR", aml_int(0)));
> -        aml_append(dev, aml_name_decl("_UID", aml_int(1)));
> +        aml_append(dev, aml_name_decl("_UID", aml_int(0)));
>          aml_append(sb_scope, dev);
>          aml_append(dsdt, sb_scope);
>  
> @@ -1512,7 +1512,7 @@ build_dsdt(GArray *table_data, BIOSLinker *linker,
>          aml_append(dev, aml_name_decl("_HID", aml_eisaid("PNP0A08")));
>          aml_append(dev, aml_name_decl("_CID", aml_eisaid("PNP0A03")));
>          aml_append(dev, aml_name_decl("_ADR", aml_int(0)));
> -        aml_append(dev, aml_name_decl("_UID", aml_int(1)));
> +        aml_append(dev, aml_name_decl("_UID", aml_int(0)));
>          aml_append(dev, build_q35_osc_method());
>          aml_append(sb_scope, dev);
>          aml_append(dsdt, sb_scope);
> 
> It looks like a regression issue in 5.2.x so I registered a bug for it: 
> https:/
> /bugs.launchpad.net/qemu/+bug/1917565
> 
> 
> On Sun, Feb 28, 2021 at 9:13 PM Nick S <nick.kvmhv@gmail.com> wrote:
> 
> 
>     I have a VM set up on a USB SSD drive that I assign directly using linux
>     device (-blockdev '{"driver":"host_device","filename":"/dev/disk/by-id/
>     
> scsi-1SanDisk_Extreme_SSD_20072F404043","aio":"native","node-name":"libvirt-2-storage","cache":
>     
> {"direct":true,"no-flush":false},"auto-read-only":true,"discard":"unmap"}')
> 
>     I've been using it for a few years now and recently decided to compile the
>     most recent version of qemu to do some hacking. To my surprise, when I
>     compiled the master branch, Windows failed to load with the "Boot Device
>     Inaccessible" error. I went through tags in git and the latest tag that
>     works is 5.1.0. On 5.2.0-rc0 I started getting this error. Was something
>     changed recently for passing a linux block device as "raw"?
> 
>     Thank you,
>     Nick
>