Re: [RFC PATCH 1/1] platform-msi: Add platform check for subdevice irq domain

[David Woodhouse]

On Thu, 2020-12-10 at 08:46 +0800, Lu Baolu wrote:
> +/*
> + * We want to figure out which context we are running in. But the hardware
> + * does not introduce a reliable way (instruction, CPUID leaf, MSR, whatever)
> + * which can be manipulated by the VMM to let the OS figure out where it runs.
> + * So we go with the below probably_on_bare_metal() function as a replacement
> + * for definitely_on_bare_metal() to go forward only for the very simple reason
> + * that this is the only option we have.
> + */
> +static const char * const possible_vmm_vendor_name[] = {
> +       "QEMU", "Bochs", "KVM", "Xen", "VMware", "VMW", "VMware Inc.",
> +       "innotek GmbH", "Oracle Corporation", "Parallels", "BHYVE",
> +       "Microsoft Corporation"
> +};

People do use SeaBIOS ("Bochs") on bare metal.

You'll also see "Amazon EC2" on virt instances as well as bare metal
instances. Although in that case I believe the virt instances do have
the 'virtual machine' flag set in bit 4 of the BIOS Characteristics
Extension Byte 2, and the bare metal obviously don't.

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