| Message ID | 20201117181607.1761516-9-qperret@google.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | KVM/arm64: A stage 2 for the host | expand |
On Tue, Nov 17, 2020 at 06:15:48PM +0000, 'Quentin Perret' via kernel-team wrote: > kvm_call_hyp() has some logic to issue a function call or a hypercall > depending the EL at which the kernel is running. However, all the code > compiled under __KVM_NVHE_HYPERVISOR__ is guaranteed to run only at EL2, > and in this case a simple function call is needed. > > Add ifdefery to kvm_host.h to symplify kvm_call_hyp() in .hyp.text. > > Signed-off-by: Quentin Perret <qperret@google.com> > --- > arch/arm64/include/asm/kvm_host.h | 6 ++++++ > 1 file changed, 6 insertions(+) > > diff --git a/arch/arm64/include/asm/kvm_host.h b/arch/arm64/include/asm/kvm_host.h > index ac11adab6602..7a5d5f4b3351 100644 > --- a/arch/arm64/include/asm/kvm_host.h > +++ b/arch/arm64/include/asm/kvm_host.h > @@ -557,6 +557,7 @@ int kvm_test_age_hva(struct kvm *kvm, unsigned long hva); > void kvm_arm_halt_guest(struct kvm *kvm); > void kvm_arm_resume_guest(struct kvm *kvm); > > +#ifndef __KVM_NVHE_HYPERVISOR__ > #define kvm_call_hyp_nvhe(f, ...) \ > ({ \ > struct arm_smccc_res res; \ > @@ -596,6 +597,11 @@ void kvm_arm_resume_guest(struct kvm *kvm); > \ > ret; \ > }) > +#else /* __KVM_NVHE_HYPERVISOR__ */ > +#define kvm_call_hyp(f, ...) f(__VA_ARGS__) > +#define kvm_call_hyp_ret(f, ...) f(__VA_ARGS__) > +#define kvm_call_hyp_nvhe(f, ...) f(__VA_ARGS__) > +#endif /* __KVM_NVHE_HYPERVISOR__ */ I was hoping we could define this as the following instead. That would require adding host-side declarations of all functions currently called with _nvhe. #define kvm_call_hyp_nvhe(f, ...) \ + is_nvhe_hyp_code() ? f(__VA_ARGS__) : \ ({ \ struct arm_smccc_res res; \ \ arm_smccc_1_1_hvc(KVM_HOST_SMCCC_FUNC(f), \ ##__VA_ARGS__, &res); \ WARN_ON(res.a0 != SMCCC_RET_SUCCESS); \ \ res.a1; \ }) Up to you what you think is cleaner, just my 2 cents...
diff --git a/arch/arm64/include/asm/kvm_host.h b/arch/arm64/include/asm/kvm_host.h index ac11adab6602..7a5d5f4b3351 100644 --- a/arch/arm64/include/asm/kvm_host.h +++ b/arch/arm64/include/asm/kvm_host.h @@ -557,6 +557,7 @@ int kvm_test_age_hva(struct kvm *kvm, unsigned long hva); void kvm_arm_halt_guest(struct kvm *kvm); void kvm_arm_resume_guest(struct kvm *kvm); +#ifndef __KVM_NVHE_HYPERVISOR__ #define kvm_call_hyp_nvhe(f, ...) \ ({ \ struct arm_smccc_res res; \ @@ -596,6 +597,11 @@ void kvm_arm_resume_guest(struct kvm *kvm); \ ret; \ }) +#else /* __KVM_NVHE_HYPERVISOR__ */ +#define kvm_call_hyp(f, ...) f(__VA_ARGS__) +#define kvm_call_hyp_ret(f, ...) f(__VA_ARGS__) +#define kvm_call_hyp_nvhe(f, ...) f(__VA_ARGS__) +#endif /* __KVM_NVHE_HYPERVISOR__ */ void force_vm_exit(const cpumask_t *mask); void kvm_mmu_wp_memory_region(struct kvm *kvm, int slot);
kvm_call_hyp() has some logic to issue a function call or a hypercall depending the EL at which the kernel is running. However, all the code compiled under __KVM_NVHE_HYPERVISOR__ is guaranteed to run only at EL2, and in this case a simple function call is needed. Add ifdefery to kvm_host.h to symplify kvm_call_hyp() in .hyp.text. Signed-off-by: Quentin Perret <qperret@google.com> --- arch/arm64/include/asm/kvm_host.h | 6 ++++++ 1 file changed, 6 insertions(+)