From 1c0cd66adbac8aa339b9521eceb18b00d1b0699e Mon Sep 17 00:00:00 2001 From: James Hogan Date: Fri, 6 Feb 2015 10:56:27 +0000 Subject: MIPS: KVM: Add FP exception handling Add guest exception handling for floating point exceptions and coprocessor 1 unusable exceptions. Floating point exceptions from the guest need passing to the guest kernel, so for these a guest FPE is emulated. Also, coprocessor 1 unusable exceptions are normally passed straight through to the guest (because no guest FPU was supported), but the hypervisor can now handle them if the guest has its FPU enabled by restoring the guest FPU context and enabling the FPU. Signed-off-by: James Hogan Cc: Paolo Bonzini Cc: Paul Burton Cc: Ralf Baechle Cc: Gleb Natapov Cc: linux-mips@linux-mips.org Cc: kvm@vger.kernel.org --- arch/mips/kvm/mips.c | 7 +++++++ 1 file changed, 7 insertions(+) (limited to 'arch/mips/kvm/mips.c') diff --git a/arch/mips/kvm/mips.c b/arch/mips/kvm/mips.c index b26a48d..dd08338 100644 --- a/arch/mips/kvm/mips.c +++ b/arch/mips/kvm/mips.c @@ -50,6 +50,7 @@ struct kvm_stats_debugfs_item debugfs_entries[] = { { "resvd_inst", VCPU_STAT(resvd_inst_exits), KVM_STAT_VCPU }, { "break_inst", VCPU_STAT(break_inst_exits), KVM_STAT_VCPU }, { "trap_inst", VCPU_STAT(trap_inst_exits), KVM_STAT_VCPU }, + { "fpe", VCPU_STAT(fpe_exits), KVM_STAT_VCPU }, { "flush_dcache", VCPU_STAT(flush_dcache_exits), KVM_STAT_VCPU }, { "halt_successful_poll", VCPU_STAT(halt_successful_poll), KVM_STAT_VCPU }, { "halt_wakeup", VCPU_STAT(halt_wakeup), KVM_STAT_VCPU }, @@ -1148,6 +1149,12 @@ int kvm_mips_handle_exit(struct kvm_run *run, struct kvm_vcpu *vcpu) ret = kvm_mips_callbacks->handle_trap(vcpu); break; + case T_FPE: + ++vcpu->stat.fpe_exits; + trace_kvm_exit(vcpu, FPE_EXITS); + ret = kvm_mips_callbacks->handle_fpe(vcpu); + break; + case T_MSADIS: ret = kvm_mips_callbacks->handle_msa_disabled(vcpu); break; -- cgit v1.1