On Mon, Feb 26, 2024 at 04:00:34PM +0100, Gerd Hoffmann wrote:
> On Mon, Feb 26, 2024 at 10:56:05AM +0000, Max Tottenham wrote:
> > On 02/26, Gerd Hoffmann wrote:
> > > Recommended action: turn off 64-bit support (long mode) in the cpu:
> > >
> > > qemu -cpu host,lm=off
> >
> > Hi Gerd
> >
> > Thanks for the response,
> >
> > that gets the VM booting - unfortunately we have many customers who may
> > be running 32bit distro kernels - we won't know ahead of time before
> > launching the VM whether they need this compatibility flag or not, I
> > don't think we can use this as a suitable work-around.
>
> You can turn this off completely this way:
Apologies for resurrecting this old thread. We have just hit this case.
> +#if 0
> if (CPUPhysBits >= 36 && CPULongMode && RamSizeOver4G)
> pci_pad_mem64 = 1;
> +#endif
>
> dprintf(1, "=== PCI bus & bridge init ===\n");
> if (pci_probe_host() != 0) {
>
> Another option would be to try tweak the condition which turns on
> pci_pad_mem64. The obvious candidate would be to raise the memory
> limit, i.e. turn this on only in case memory is present above 64G
> (outside the PAE-addressable physical address space), or choose
> some value between 4G and 64G.
>
> I'm wondering how widespread it is in 2024 to run 32bit kernels with
> alot of memory?
I see that no change has been made to seabios for this regression. Is it the
position of the maintainers that such guest VMs are no longer supported by
seabios, and anyone doing so is responsible for patching as necessary?
Or would there still be interest in fixing this up in master?
thanks
john
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