Re: [PATCH 3/4] KVM: arm64: Convert the host S2 over to __load_guest_stage2()
From: Quentin Perret <hidden>
Date: 2021-08-06 13:41:34
Also in:
kvmarm, linux-arm-kernel
On Friday 06 Aug 2021 at 12:31:07 (+0100), Will Deacon wrote:
quoted hunk ↗ jump to hunk
From: Marc Zyngier <maz@kernel.org> 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@arm.com> Cc: Jade Alglave <redacted> Cc: Shameer Kolothum <redacted> Signed-off-by: Marc Zyngier <maz@kernel.org> Signed-off-by: Will Deacon <will@kernel.org> --- 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