[RFC PATCH v1 0/2] Allow the RAS feature bit in ID_AA64PFR0_EL1 writable from userspace

Shaoqin Huang
2024-09-26T03:23:14Z

Currently the RAS feature bit is not writable in ID_AA64PFR0EL1, this makes
migration fail when migration from the machine which RAS is 1 to another machine
which RAS is 2.

Allow RAS writable from userspace would make the migration possible between two
machines which RAS is different.

Shaoqin Huang (2):
KVM: arm64: Use kvm_has_feat() to check if FEAT_RAS is advertised to
the guest
KVM: arm64: Allow the RAS feature bit in ID_AA64PFR0_EL1 writable from
userspace

arch/arm64/kvm/guest.c | 4 ++--
arch/arm64/kvm/handle_exit.c | 2 +-
arch/arm64/kvm/hyp/include/hyp/switch.h | 2 +-
arch/arm64/kvm/hyp/include/hyp/sysreg-sr.h | 7 +++++--
arch/arm64/kvm/sys_regs.c | 3 +--
tools/testing/selftests/kvm/aarch64/set_id_regs.c | 1 +
6 files changed, 11 insertions(+), 8 deletions(-)

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2.40.1