mirror of https://github.com/acidanthera/audk.git
6ced1e91ef
BZ: https://bugzilla.tianocore.org/show_bug.cgi?id=4654 Add initial support for the new AmdSvsmLib library to OvmfPkg. The initial implementation fully implements the library interfaces. The SVSM presence check, AmdSvsmIsSvsmPresent(), determines the presence of an SVSM by checking if an SVSM has been advertised in the SEV-SNP Secrets Page. The VMPL API, AmdSvsmSnpGetVmpl(), returns the VMPL level at which OVMF is currently running. The CAA API, AmdSvsmSnpGetCaa(), returns the Calling Area Address when an SVSM is present, 0 otherwise. The PVALIDATE API, AmdSvsmSnpPvalidate(), copies the PVALIDATE logic from the BaseMemEncryptSevLib library for the initial implementation. The BaseMemEncryptSevLib library will be changed to use this new API so that the decision as to whether the SVSM is needed to perform the operation can be isolated to this library. The VMSA API, AmdSvsmSnpVmsaRmpAdjust(), copies the RMPUPDATE logic from the MpInitLib library for the initial implementation. The MpInitLib library will be changed to use this new API so that the decision as to whether the SVSM is needed to perform the operation can be isolated to this library. Cc: Anatol Belski <anbelski@linux.microsoft.com> Cc: Ard Biesheuvel <ardb+tianocore@kernel.org> Cc: Erdem Aktas <erdemaktas@google.com> Cc: Gerd Hoffmann <kraxel@redhat.com> Cc: Jianyong Wu <jianyong.wu@arm.com> Cc: Jiewen Yao <jiewen.yao@intel.com> Cc: Laszlo Ersek <lersek@redhat.com> Cc: Michael Roth <michael.roth@amd.com> Cc: Min Xu <min.m.xu@intel.com> Signed-off-by: Tom Lendacky <thomas.lendacky@amd.com> Acked-by: Gerd Hoffmann <kraxel@redhat.com> |
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README
This is an *experimental* port of OVMF for the QEMU microvm machine type. microvm background info ----------------------- microvm is designed for modern, virtio-based workloads. Most legacy lpc/isa devices like pit and pic can be turned off. virtio-mmio (i.e. '-device virtio-{blk,net,scsi,...}-device') is used for storage/network/etc. Optional pcie support is available and any pcie device supported by QEMU can be plugged in (including virtio-pci if you prefer that over virtio-mmio). https://qemu.readthedocs.io/en/latest/system/i386/microvm.html https://www.kraxel.org/blog/2020/10/qemu-microvm-acpi/ design issues ------------- Not fully clear yet how to do hardware detection best. Right now using device tree to find virtio-mmio devices and pcie host bridge, can reuse existing ArmVirtPkg code that way. Needs patched QEMU. features -------- [working] serial console [working] direct kernel boot [working] virtio-mmio support [working] pcie support known limitations ----------------- * rtc=on is required for now. * can't use separate code/vars (actually an microvm limitation, there is no pflash support). * transitional virtio-pci devices do not work. microvm doesn't support ioports on pcie, and ovmf doesn't initialize pcie devices with ioports if there is no address space for them (even though pcie devices are required to be functional without ioports). usage ----- qemu-system-x86_64 \ -nographic \ -machine microvm,acpi=on,pit=off,pic=off,rtc=on \ -bios /path/to/MICROVM.fd \ [ ... more args here ... ]