[PATCH v2 23/28] arm64/sve: KVM: Treat guest SVE use as undefined instruction execution
From: Alex Bennée <hidden>
Date: 2017-09-14 13:30:03
Also in:
kvmarm, linux-arch
Dave Martin [off-list ref] writes:
When trapping forbidden attempts by a guest to use SVE, we want the guest to see a trap consistent with SVE not being implemented. This patch injects an undefined instruction exception into the guest in response to such an exception. Signed-off-by: Dave Martin <Dave.Martin@arm.com>
Reviewed-by: Alex Benn?e <redacted>
quoted hunk ↗ jump to hunk
--- arch/arm64/kvm/handle_exit.c | 8 ++++++++ 1 file changed, 8 insertions(+)diff --git a/arch/arm64/kvm/handle_exit.c b/arch/arm64/kvm/handle_exit.c index 17d8a16..e3e42d0 100644 --- a/arch/arm64/kvm/handle_exit.c +++ b/arch/arm64/kvm/handle_exit.c@@ -147,6 +147,13 @@ static int kvm_handle_unknown_ec(struct kvm_vcpu *vcpu, struct kvm_run *run) return 1; } +static int handle_sve(struct kvm_vcpu *vcpu, struct kvm_run *run) +{ + /* Until SVE is supported for guests: */ + kvm_inject_undefined(vcpu); + return 1; +} + static exit_handle_fn arm_exit_handlers[] = { [0 ... ESR_ELx_EC_MAX] = kvm_handle_unknown_ec, [ESR_ELx_EC_WFx] = kvm_handle_wfx,@@ -160,6 +167,7 @@ static exit_handle_fn arm_exit_handlers[] = { [ESR_ELx_EC_HVC64] = handle_hvc, [ESR_ELx_EC_SMC64] = handle_smc, [ESR_ELx_EC_SYS64] = kvm_handle_sys_reg, + [ESR_ELx_EC_SVE] = handle_sve, [ESR_ELx_EC_IABT_LOW] = kvm_handle_guest_abort, [ESR_ELx_EC_DABT_LOW] = kvm_handle_guest_abort, [ESR_ELx_EC_SOFTSTP_LOW]= kvm_handle_guest_debug,
-- Alex Benn?e