Re: [PATCH 02/26] KVM: arm64: Move __load_guest_stage2 to kvm_mmu.h

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Hi Suzuki,

On 2020-04-22 14:51, Suzuki K Poulose wrote:
Hi Marc,


On 04/22/2020 01:00 PM, Marc Zyngier wrote:
Having __load_guest_stage2 in kvm_hyp.h is quickly going to trigger
a circular include problem. In order to avoid this, let's move
it to kvm_mmu.h, where it will be a better fit anyway.

In the process, drop the __hyp_text annotation, which doesn't help
as the function is marked as __always_inline.

Signed-off-by: Marc Zyngier <maz@xxxxxxxxxx>

---
  arch/arm64/include/asm/kvm_hyp.h | 18 ------------------
  arch/arm64/include/asm/kvm_mmu.h | 17 +++++++++++++++++
  2 files changed, 17 insertions(+), 18 deletions(-)

diff --git a/arch/arm64/include/asm/kvm_hyp.h b/arch/arm64/include/asm/kvm_hyp.h
index fe57f60f06a89..dcb63bf941057 100644
--- a/arch/arm64/include/asm/kvm_hyp.h
+++ b/arch/arm64/include/asm/kvm_hyp.h
@@ -10,7 +10,6 @@
  #include <linux/compiler.h>
  #include <linux/kvm_host.h>
  #include <asm/alternative.h>
-#include <asm/kvm_mmu.h>
  #include <asm/sysreg.h>
    #define __hyp_text __section(.hyp.text) notrace
@@ -88,22 +87,5 @@ void deactivate_traps_vhe_put(void);
u64 __guest_enter(struct kvm_vcpu *vcpu, struct kvm_cpu_context *host_ctxt);
  void __noreturn __hyp_do_panic(unsigned long, ...);
  -/*
- * Must be called from hyp code running at EL2 with an updated VTTBR
- * and interrupts disabled.
- */
-static __always_inline void __hyp_text __load_guest_stage2(struct kvm *kvm)
-{
-	write_sysreg(kvm->arch.vtcr, vtcr_el2);
-	write_sysreg(kvm_get_vttbr(kvm), vttbr_el2);
-
-	/*
- * ARM errata 1165522 and 1530923 require the actual execution of the - * above before we can switch to the EL1/EL0 translation regime used by
-	 * the guest.
-	 */
-	asm(ALTERNATIVE("nop", "isb", ARM64_WORKAROUND_SPECULATIVE_AT_VHE));
-}
-
  #endif /* __ARM64_KVM_HYP_H__ */
diff --git a/arch/arm64/include/asm/kvm_mmu.h b/arch/arm64/include/asm/kvm_mmu.h
index 30b0e8d6b8953..5ba1310639ec6 100644
--- a/arch/arm64/include/asm/kvm_mmu.h
+++ b/arch/arm64/include/asm/kvm_mmu.h
@@ -604,5 +604,22 @@ static __always_inline u64 kvm_get_vttbr(struct kvm *kvm)
  	return kvm_phys_to_vttbr(baddr) | vmid_field | cnp;
  }
  +/*
+ * 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 *kvm)
+{
+	write_sysreg(kvm->arch.vtcr, vtcr_el2);
+	write_sysreg(kvm_get_vttbr(kvm), vttbr_el2);
+
+	/*
+	 * ARM erratum 1165522 requires the actual execution of the above

Is it intentional to drop the reference to errata 1530923 ?

No, that's obviously the effect of a bad conflict resolution during a rebase.
I'll fix it now, thanks for spotting it.

Otherwise :

Reviewed-by: Suzuki K Poulose <suzuki.poulose@xxxxxxx>

Cheers,

        M.
--
Jazz is not dead. It just smells funny...



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