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LoongArch: KVM: Add hypercall service support for usermode VMM

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Some VMMs provides special hypercall service in usermode, KVM should not
handle the usermode hypercall service, thus pass it to usermode, let the
usermode VMM handle it.

Here a new code KVM_HCALL_CODE_USER_SERVICE is added for the user-mode
hypercall service, KVM lets all six registers visible to usermode VMM.

Signed-off-by: Bibo Mao <maobibo@loongson.cn>
Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>
This commit is contained in:
Bibo Mao
2025-01-13 21:37:17 +08:00
committed by Huacai Chen
parent 4d38d0416e
commit 2737dee106
6 changed files with 42 additions and 1 deletions
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7
arch/loongarch/kvm/vcpu.c
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@@ -1732,9 +1732,14 @@ int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu *vcpu)
vcpu->mmio_needed = 0;
}
if (run->exit_reason == KVM_EXIT_LOONGARCH_IOCSR) {
switch (run->exit_reason) {
case KVM_EXIT_HYPERCALL:
kvm_complete_user_service(vcpu, run);
break;
case KVM_EXIT_LOONGARCH_IOCSR:
if (!run->iocsr_io.is_write)
kvm_complete_iocsr_read(vcpu, run);
break;
}
if (!vcpu->wants_to_run)