[PATCH v5 0/7] Add RAS virtualization support to SEA/SEI notification type

Dongjiu Geng
2017-08-18T13:47:56Z

In the firmware-first RAS solution, corrupt data is detected in a
memory location when guest OS application software executing at EL0
or guest OS kernel El1 software are reading from the memory. The
memory node records errors in an error record accessible using
system registers.

Because SCR_EL3.EA is 1, then CPU will trap to El3 firmware, EL3
firmware records the error to APEI table through reading system
register.

Because the error was taken from a lower Exception leve, if the
exception is SEA/SEI and HCR_EL2.TEA/HCR_EL2.AMO is 1, firmware
sets ESR_EL2/FAR_El to fake a exception trap to EL2, then
transfers to hypervisor.

Hypervisor calls the momory failure to deal with this error, momory
failure read the APEI table and decide whether it needs to deliver
SIGBUS signal to user space, the advantage of using SIGBUS signal
to notify user space is that it can be compatible Non-Kvm users.

Dongjiu Geng (5):
acpi: apei: Add SEI notification type support for ARMv8
support user space to query RAS extension feature
arm64: kvm: route synchronous external abort exceptions to el2
KVM: arm/arm64: Allow get exception syndrome and
arm64: kvm: handle SEI notification and inject virtual SError

James Morse (1):
KVM: arm64: Save ESR_EL2 on guest SError

Xie XiuQi (1):
arm64: cpufeature: Detect CPU RAS Extentions

arch/arm/include/asm/kvm_host.h | 2 ++
arch/arm/kvm/guest.c | 5 +++
arch/arm64/Kconfig | 16 ++++++++++
arch/arm64/include/asm/barrier.h | 1 +
arch/arm64/include/asm/cpucaps.h | 3 +-
arch/arm64/include/asm/kvm_arm.h | 2 ++
arch/arm64/include/asm/kvm_emulate.h | 17 ++++++++++
arch/arm64/include/asm/kvm_host.h | 2 ++
arch/arm64/include/asm/sysreg.h | 5 +++
arch/arm64/include/asm/system_misc.h | 1 +
arch/arm64/include/uapi/asm/kvm.h | 5 +++
arch/arm64/kernel/cpufeature.c | 13 ++++++++
arch/arm64/kernel/process.c | 3 ++
arch/arm64/kvm/guest.c | 48 +++++++++++++++++++++++++++++
arch/arm64/kvm/handle_exit.c | 21 +++++++++++--
arch/arm64/kvm/hyp/switch.c | 29 +++++++++++++++--
arch/arm64/kvm/reset.c | 3 ++
arch/arm64/mm/fault.c | 21 +++++++++++--
drivers/acpi/apei/Kconfig | 15 +++++++++
drivers/acpi/apei/ghes.c | 60 +++++++++++++++++++++++-------------
include/acpi/ghes.h | 2 +-
include/uapi/linux/kvm.h | 3 ++
virt/kvm/arm/arm.c | 7 +++++
23 files changed, 254 insertions(+), 30 deletions(-)

--
2.14.0