tree 9885a7108c2f1c6c6d6972f1c5e9056428250928
parent 116551307532d759b937d4d268251ec5e6949080
author Alistair Delva <adelva@google.com> 1595027858 -0700
committer Alistair Delva <adelva@google.com> 1595474867 -0700

Add ramoops pstore support to QEMU

Implement ramoops pstore using a fake 2MB NVDIMM. QEMU will assign the
NVDIMM to 0x100000000, next to any other pmem region. Currently, the x86
GKI kernel doesn't support NVDIMM detection via CONFIG_ACPI_NFIT, which
is actually a good thing because then the LIBNVDIMM driver would claim
the region, which we don't want (we want to be able to claim with the
legacy "ramoops pstore" driver).

In the longer term, we should add a pmem backend to the pstore driver,
then we can simply use virtio_pmem, which will also enable arm64
support.

Bug: 159242186
Change-Id: Ic434c62f458a7b0ddb47a985d23f4fa76e461734
Signed-off-by: Alistair Delva <adelva@google.com>