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Date:   Wed, 10 Mar 2021 17:57:25 +0000
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Subject: [PATCH v4 08/34] KVM: arm64: Make kvm_call_hyp() a function call at Hyp
From:   Quentin Perret <qperret@google.com>
To:     catalin.marinas@arm.com, will@kernel.org, maz@kernel.org,
        james.morse@arm.com, julien.thierry.kdev@gmail.com,
        suzuki.poulose@arm.com
Cc:     android-kvm@google.com, linux-kernel@vger.kernel.org,
        kernel-team@android.com, kvmarm@lists.cs.columbia.edu,
        linux-arm-kernel@lists.infradead.org, tabba@google.com,
        mark.rutland@arm.com, dbrazdil@google.com, mate.toth-pal@arm.com,
        seanjc@google.com, qperret@google.com, robh+dt@kernel.org,
        ardb@kernel.org
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Precedence: bulk

kvm_call_hyp() has some logic to issue a function call or a hypercall
depending on the EL at which the kernel is running. However, all the
code compiled under __KVM_NVHE_HYPERVISOR__ is guaranteed to only run
at EL2 which allows us to simplify.

Add ifdefery to kvm_host.h to simplify kvm_call_hyp() in .hyp.text.

Acked-by: Will Deacon <will@kernel.org>
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 3d10e6527f7d..06ca4828005f 100644
--- a/arch/arm64/include/asm/kvm_host.h
+++ b/arch/arm64/include/asm/kvm_host.h
@@ -591,6 +591,7 @@ 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;				\
@@ -630,6 +631,11 @@ 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);
-- 
2.30.1.766.gb4fecdf3b7-goog