From: William Roche <william.roche@xxxxxxxxxx> This set of patches fixes several problems with hardware memory errors impacting hugetlbfs memory backed VMs. When using hugetlbfs large pages, any large page location being impacted by an HW memory error results in poisoning the entire page, suddenly making a large chunk of the VM memory unusable. The main problem that currently exists in Qemu is the lack of backend file repair before resetting the VM memory, resulting in the impacted memory to be silently unusable even after a VM reboot. In order to fix this issue, we track the SIGBUS page size information when informed of a HW error (with si_addr_lsb) and record the size with the appropriate poisoned page location. On recording a large page position, we take note of the beginning of the page and its size. The size information is taken from the backend file page_size value. Also provide the impact information of a large page of memory loss, only reported once when the page is poisoned -- for a better debug-ability of these situations. This code is scripts/checkpatch.pl clean 'make check' runs fine on both x86 and ARM. Units tests have been successfully run on x86, but the ARM VM doesn't deal with several errors on different memory locations triggered too quickly from each other (which is the case with hugetlbfs page being poisoned) and either aborts after a "failed to record the error" message or becomes unresponsive. William Roche (4): accel/kvm: SIGBUS handler should also deal with si_addr_lsb accel/kvm: Keep track of the HWPoisonPage page_size system/physmem: Largepage punch hole before reset of memory pages accel/kvm: Report the loss of a large memory page accel/kvm/kvm-all.c | 27 +++++++++++++++++++++------ accel/stubs/kvm-stub.c | 4 ++-- include/exec/cpu-common.h | 1 + include/qemu/osdep.h | 5 +++-- include/sysemu/kvm.h | 7 ++++--- include/sysemu/kvm_int.h | 7 +++++-- system/cpus.c | 6 ++++-- system/physmem.c | 28 ++++++++++++++++++++++++++++ target/arm/kvm.c | 8 ++++++-- target/i386/kvm/kvm.c | 8 ++++++-- util/oslib-posix.c | 3 +++ 11 files changed, 83 insertions(+), 21 deletions(-) -- 2.43.5
