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[6.6-velinux] Intel: SierreForest MAXPHYADDR support

Open x56Jason opened this issue 10 months ago • 0 comments

Description

This is to backport the following 2 upstream commits to support SRF MAXPHYADDR. SRF doesn't support 5-level EPT but has 52-bit physical address(MAXPHYADDR). With some specific Qemu version, this can cause KVM infinite loop when guest BIOS puts RAM memory or 64-bit PCI BAR in high physical address.

b628cb523c65420031b310050a3733aa7fbe2e88 KVM: x86: Advertise max mappable GPA in CPUID.0x80000008.GuestPhysBits 980b8bc01938c8bcc9742c1051f64b5f0ed178ac KVM: selftests: x86: Prioritize getting max_gfn from GuestPhysBits

Test

  • Sanity Test, build and run VM
  • On SRF platform, passthrough a NIC which has a 64-bit BAR to VM, the VM can boot successfully without hang.

x56Jason avatar Mar 27 '25 07:03 x56Jason