diff options
| author | Bibo Mao <maobibo@loongson.cn> | 2024-05-06 22:00:46 +0800 |
|---|---|---|
| committer | Huacai Chen <chenhuacai@loongson.cn> | 2024-05-06 22:00:46 +0800 |
| commit | 372631bb62d3791f0122a67f5a3e959a4d99bebd (patch) | |
| tree | aca3159d80eacf27edfd3745fae958f22a292821 /arch/loongarch/kvm | |
| parent | 316863cb62fe7aaea30e7ef8e6481f1ba414b044 (diff) | |
| download | lwn-372631bb62d3791f0122a67f5a3e959a4d99bebd.tar.gz lwn-372631bb62d3791f0122a67f5a3e959a4d99bebd.zip | |
LoongArch: KVM: Add hypercall instruction emulation
On LoongArch system, there is a hypercall instruction special for
virtualization. When system executes this instruction on host side,
there is an illegal instruction exception reported, however it will
trap into host when it is executed in VM mode.
When hypercall is emulated, A0 register is set with value
KVM_HCALL_INVALID_CODE, rather than inject EXCCODE_INE invalid
instruction exception. So VM can continue to executing the next code.
Signed-off-by: Bibo Mao <maobibo@loongson.cn>
Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>
Diffstat (limited to 'arch/loongarch/kvm')
| -rw-r--r-- | arch/loongarch/kvm/exit.c | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/arch/loongarch/kvm/exit.c b/arch/loongarch/kvm/exit.c index ed1d89d53e2e..f368673db395 100644 --- a/arch/loongarch/kvm/exit.c +++ b/arch/loongarch/kvm/exit.c @@ -685,6 +685,16 @@ static int kvm_handle_lasx_disabled(struct kvm_vcpu *vcpu) return RESUME_GUEST; } +static int kvm_handle_hypercall(struct kvm_vcpu *vcpu) +{ + update_pc(&vcpu->arch); + + /* Treat it as noop intruction, only set return value */ + vcpu->arch.gprs[LOONGARCH_GPR_A0] = KVM_HCALL_INVALID_CODE; + + return RESUME_GUEST; +} + /* * LoongArch KVM callback handling for unimplemented guest exiting */ @@ -716,6 +726,7 @@ static exit_handle_fn kvm_fault_tables[EXCCODE_INT_START] = { [EXCCODE_LSXDIS] = kvm_handle_lsx_disabled, [EXCCODE_LASXDIS] = kvm_handle_lasx_disabled, [EXCCODE_GSPR] = kvm_handle_gspr, + [EXCCODE_HVC] = kvm_handle_hypercall, }; int kvm_handle_fault(struct kvm_vcpu *vcpu, int fault) |