Re: [kvm-unit-tests PATCH] x86: check that clflushopt of an MMIO address succeeds

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> On Nov 3, 2020, at 8:08 AM, David Edmondson <david.edmondson@xxxxxxxxxx> wrote:
> 
> Verify that the clflushopt instruction succeeds when applied to an
> MMIO address at both cpl0 and cpl3.
> 
> Suggested-by: Joao Martins <joao.m.martins@xxxxxxxxxx>
> Signed-off-by: David Edmondson <david.edmondson@xxxxxxxxxx>
> 

[snip]

> +	ret = pci_find_dev(PCI_VENDOR_ID_REDHAT, PCI_DEVICE_ID_REDHAT_TEST);
> +	if (ret != PCIDEVADDR_INVALID) {
> +		pci_dev_init(&pcidev, ret);

Just wondering, and perhaps this question is more general: does this test
really need the Red-Hat test device?

I know it is an emulated device, but can’t we use some other MMIO address
(e.g., PIT) that is also available on bare-metal?





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