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[RFC,v2,22/26] KVM: arm64: Refactor __load_guest_stage2()

Message ID 20210108121524.656872-23-qperret@google.com (mailing list archive)
State New, archived
Headers show
Series KVM/arm64: A stage 2 for the host | expand

Commit Message

Quentin Perret Jan. 8, 2021, 12:15 p.m. UTC 
Refactor __load_guest_stage2() to introduce __load_stage2() which will
be re-used when loading the host stage 2.

Signed-off-by: Quentin Perret <qperret@google.com>
---
 arch/arm64/include/asm/kvm_mmu.h | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

Comments

Will Deacon Feb. 3, 2021, 3:54 p.m. UTC | #1 
On Fri, Jan 08, 2021 at 12:15:20PM +0000, Quentin Perret wrote:
> Refactor __load_guest_stage2() to introduce __load_stage2() which will
> be re-used when loading the host stage 2.
> 
> Signed-off-by: Quentin Perret <qperret@google.com>
> ---
>  arch/arm64/include/asm/kvm_mmu.h | 9 +++++++--
>  1 file changed, 7 insertions(+), 2 deletions(-)

Acked-by: Will Deacon <will@kernel.org>

Will
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Patch

diff --git a/arch/arm64/include/asm/kvm_mmu.h b/arch/arm64/include/asm/kvm_mmu.h
index 83b4c5cf4768..8d37d6d1ed29 100644
--- a/arch/arm64/include/asm/kvm_mmu.h
+++ b/arch/arm64/include/asm/kvm_mmu.h
@@ -345,9 +345,9 @@  static __always_inline u64 kvm_get_vttbr(struct kvm_s2_mmu *mmu)
  * Must be called from hyp code running at EL2 with an updated VTTBR
  * and interrupts disabled.
  */
-static __always_inline void __load_guest_stage2(struct kvm_s2_mmu *mmu)
+static __always_inline void __load_stage2(struct kvm_s2_mmu *mmu, unsigned long vtcr)
 {
-	write_sysreg(kern_hyp_va(mmu->arch)->vtcr, vtcr_el2);
+	write_sysreg(vtcr, vtcr_el2);
 	write_sysreg(kvm_get_vttbr(mmu), vttbr_el2);
 
 	/*
@@ -358,6 +358,11 @@  static __always_inline void __load_guest_stage2(struct kvm_s2_mmu *mmu)
 	asm(ALTERNATIVE("nop", "isb", ARM64_WORKAROUND_SPECULATIVE_AT));
 }
 
+static __always_inline void __load_guest_stage2(struct kvm_s2_mmu *mmu)
+{
+	__load_stage2(mmu, kern_hyp_va(mmu->arch)->vtcr);
+}
+
 static inline struct kvm *kvm_s2_mmu_to_kvm(struct kvm_s2_mmu *mmu)
 {
 	return container_of(mmu->arch, struct kvm, arch);