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KVM: arm64: nv: Forward SVE traps to guest hypervisor

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Similar to FPSIMD traps, don't load SVE state if the guest hypervisor
has SVE traps enabled and forward the trap instead. Note that ZCR_EL2
will require some special handling, as it takes a sysreg trap to EL2
when HCR_EL2.NV = 1.

Reviewed-by: Marc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/20240620164653.1130714-3-oliver.upton@linux.dev
Signed-off-by: Oliver Upton <oliver.upton@linux.dev>
This commit is contained in:
Oliver Upton 2024-06-20 16:46:39 +00:00
parent d2b2ecba8d
commit 399debfc97
3 changed files with 9 additions and 0 deletions
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4
arch/arm64/include/asm/kvm_emulate.h
View File

@ -702,5 +702,9 @@ static inline bool guest_hyp_fpsimd_traps_enabled(const struct kvm_vcpu *vcpu)
return __guest_hyp_cptr_xen_trap_enabled(vcpu, FPEN);
}
static inline bool guest_hyp_sve_traps_enabled(const struct kvm_vcpu *vcpu)
{
return __guest_hyp_cptr_xen_trap_enabled(vcpu, ZEN);
}
#endif /* __ARM64_KVM_EMULATE_H__ */

3
arch/arm64/kvm/handle_exit.c
View File

@ -217,6 +217,9 @@ static int kvm_handle_unknown_ec(struct kvm_vcpu *vcpu)
*/
static int handle_sve(struct kvm_vcpu *vcpu)
{
if (guest_hyp_sve_traps_enabled(vcpu))
return kvm_inject_nested_sync(vcpu, kvm_vcpu_get_esr(vcpu));
kvm_inject_undefined(vcpu);
return 1;
}

2
arch/arm64/kvm/hyp/include/hyp/switch.h
View File

@ -361,6 +361,8 @@ static bool kvm_hyp_handle_fpsimd(struct kvm_vcpu *vcpu, u64 *exit_code)
case ESR_ELx_EC_SVE:
if (!sve_guest)
return false;
if (guest_hyp_sve_traps_enabled(vcpu))
return false;
break;
default:
return false;