On Tue, Jan 25, 2022 at 03:30:11PM +0100, Nicolas Ojeda Leon wrote: > Read the "hardware-info" item from fw-cfg to extract specifications > of PCI host bridges and analyze the 64-bit apertures of them to > find out the highest 64-bit MMIO address required which determines > the address space required by the guest, and, consequently, the > FirstNonAddress used to calculate size of physical addresses. > > Using the static PeiHardwareInfoLib, read the fw-cfg file of > hardware information to extract, one by one, all the host > bridges. Find the last 64-bit MMIO address of each host bridge, > using the HardwareInfoPciHostBridgeLib API, and compare it to an > accumulate value to discover the highest address used, which > corresponds to the highest value that must be included in the > guest's physical address space. > > Given that platforms with multiple host bridges may provide the PCI > apertures' addresses, the memory detection logic must take into > account that, if the host provided the MMIO windows that can and must > be used, the guest needs to take those values. Therefore, if the > MMIO windows are found in the host-provided fw-cfg file, skip all the > logic calculating the physical address size and just use the value > provided. Since each PCI host bridge corresponds to an element in > the information provided by the host, each of these must be analyzed > looking for the highest address used. > > Cc: Alexander Graf <g...@amazon.de> > Cc: Gerd Hoffmann <kra...@redhat.com> > > Signed-off-by: Nicolas Ojeda Leon <ncol...@amazon.com>
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