Re: Windows 10 Inaccessible Boot device starting 5.2.0-rc0

[Michael S. Tsirkin]

OK great, good to know. note it works because you
specified an old machine type as libvirt does for
old installed VMs.

My next question then is, what happens if you install
a new VM? Does it work fine for you then?


On Wed, Mar 03, 2021 at 08:56:32AM -0800, Nick S wrote:
> This change works perfectly, thank you!
> 
> On Wed, Mar 3, 2021 at 1:26 AM Michael S. Tsirkin <mst@redhat.com> wrote:
> 
>     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
>     >
> 
>