On Friday 06 Aug 2021 at 12:31:07 (+0100), Will Deacon wrote:
> From: Marc Zyngier <maz@xxxxxxxxxx>
>
> The protected mode relies on a separate helper to load the
> S2 context. Move over to the __load_guest_stage2() helper
> instead.
>
> Cc: Catalin Marinas <catalin.marinas@xxxxxxx>
> Cc: Jade Alglave <jade.alglave@xxxxxxx>
> Cc: Shameer Kolothum <shameerali.kolothum.thodi@xxxxxxxxxx>
> Signed-off-by: Marc Zyngier <maz@xxxxxxxxxx>
> Signed-off-by: Will Deacon <will@xxxxxxxxxx>
> ---
> arch/arm64/include/asm/kvm_mmu.h | 11 +++--------
> arch/arm64/kvm/hyp/include/nvhe/mem_protect.h | 2 +-
> arch/arm64/kvm/hyp/nvhe/mem_protect.c | 2 +-
> 3 files changed, 5 insertions(+), 10 deletions(-)
>
> diff --git a/arch/arm64/include/asm/kvm_mmu.h b/arch/arm64/include/asm/kvm_mmu.h
> index 05e089653a1a..934ef0deff9f 100644
> --- a/arch/arm64/include/asm/kvm_mmu.h
> +++ b/arch/arm64/include/asm/kvm_mmu.h
> @@ -267,9 +267,10 @@ 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_stage2(struct kvm_s2_mmu *mmu, unsigned long vtcr)
> +static __always_inline void __load_guest_stage2(struct kvm_s2_mmu *mmu,
> + struct kvm_arch *arch)
> {
> - write_sysreg(vtcr, vtcr_el2);
> + write_sysreg(arch->vtcr, vtcr_el2);
> write_sysreg(kvm_get_vttbr(mmu), vttbr_el2);
>
> /*
> @@ -280,12 +281,6 @@ static __always_inline void __load_stage2(struct kvm_s2_mmu *mmu, unsigned long
> asm(ALTERNATIVE("nop", "isb", ARM64_WORKAROUND_SPECULATIVE_AT));
> }
>
> -static __always_inline void __load_guest_stage2(struct kvm_s2_mmu *mmu,
> - struct kvm_arch *arch)
> -{
> - __load_stage2(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);
> diff --git a/arch/arm64/kvm/hyp/include/nvhe/mem_protect.h b/arch/arm64/kvm/hyp/include/nvhe/mem_protect.h
> index 9c227d87c36d..a910648bc71b 100644
> --- a/arch/arm64/kvm/hyp/include/nvhe/mem_protect.h
> +++ b/arch/arm64/kvm/hyp/include/nvhe/mem_protect.h
> @@ -29,7 +29,7 @@ void handle_host_mem_abort(struct kvm_cpu_context *host_ctxt);
> static __always_inline void __load_host_stage2(void)
> {
> if (static_branch_likely(&kvm_protected_mode_initialized))
> - __load_stage2(&host_kvm.arch.mmu, host_kvm.arch.vtcr);
> + __load_guest_stage2(&host_kvm.arch.mmu, &host_kvm.arch);
> else
> write_sysreg(0, vttbr_el2);
> }
> diff --git a/arch/arm64/kvm/hyp/nvhe/mem_protect.c b/arch/arm64/kvm/hyp/nvhe/mem_protect.c
> index d938ce95d3bd..d4e74ca7f876 100644
> --- a/arch/arm64/kvm/hyp/nvhe/mem_protect.c
> +++ b/arch/arm64/kvm/hyp/nvhe/mem_protect.c
> @@ -126,7 +126,7 @@ int __pkvm_prot_finalize(void)
> kvm_flush_dcache_to_poc(params, sizeof(*params));
>
> write_sysreg(params->hcr_el2, hcr_el2);
> - __load_stage2(&host_kvm.arch.mmu, host_kvm.arch.vtcr);
> + __load_guest_stage2(&host_kvm.arch.mmu, &host_kvm.arch);
Nit: clearly we're not loading a guest stage-2 here, so maybe the
function should take a more generic name?
Thanks,
Quentin
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