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Commit aac45ffd authored by Dave Martin's avatar Dave Martin Committed by Will Deacon
Browse files

arm64/sve: KVM: Treat guest SVE use as undefined instruction execution 



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: default avatarDave Martin <Dave.Martin@arm.com>
Reviewed-by: default avatarAlex Bennée <alex.bennee@linaro.org>
Acked-by: default avatarCatalin Marinas <catalin.marinas@arm.com>
Acked-by: default avatarChristoffer Dall <christoffer.dall@linaro.org>
Signed-off-by: default avatarWill Deacon <will.deacon@arm.com>
parent 17eed27b

arch/arm64/kvm/handle_exit.c

+8 −0
Original line number Diff line number Diff line
@@ -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,