From d196c20c6e58686fa46285c6528acc0b19357b84 Mon Sep 17 00:00:00 2001 From: Marc Zyngier Date: Wed, 14 Feb 2024 13:18:21 +0000 Subject: KVM: arm64: Streamline save/restore of HFG[RW]TR_EL2 The way we save/restore HFG[RW]TR_EL2 can now be simplified, and the Ampere erratum hack is the only thing that still stands out. Reviewed-by: Joey Gouly Signed-off-by: Marc Zyngier Link: https://lore.kernel.org/r/20240214131827.2856277-21-maz@kernel.org Signed-off-by: Oliver Upton --- arch/arm64/kvm/hyp/include/hyp/switch.h | 42 +++++++-------------------------- 1 file changed, 9 insertions(+), 33 deletions(-) (limited to 'arch/arm64/kvm/hyp/include') diff --git a/arch/arm64/kvm/hyp/include/hyp/switch.h b/arch/arm64/kvm/hyp/include/hyp/switch.h index 245f9c1ca666..2d5891518006 100644 --- a/arch/arm64/kvm/hyp/include/hyp/switch.h +++ b/arch/arm64/kvm/hyp/include/hyp/switch.h @@ -157,8 +157,6 @@ static inline void __activate_traps_hfgxtr(struct kvm_vcpu *vcpu) { struct kvm_cpu_context *hctxt = &this_cpu_ptr(&kvm_host_data)->host_ctxt; struct kvm *kvm = kern_hyp_va(vcpu->kvm); - u64 r_clr = 0, w_clr = 0, r_set = 0, w_set = 0; - u64 r_val, w_val; CHECK_FGT_MASKS(HFGRTR_EL2); CHECK_FGT_MASKS(HFGWTR_EL2); @@ -171,34 +169,10 @@ static inline void __activate_traps_hfgxtr(struct kvm_vcpu *vcpu) if (!cpus_have_final_cap(ARM64_HAS_FGT)) return; - ctxt_sys_reg(hctxt, HFGRTR_EL2) = read_sysreg_s(SYS_HFGRTR_EL2); - ctxt_sys_reg(hctxt, HFGWTR_EL2) = read_sysreg_s(SYS_HFGWTR_EL2); - - /* - * Trap guest writes to TCR_EL1 to prevent it from enabling HA or HD. - */ - if (cpus_have_final_cap(ARM64_WORKAROUND_AMPERE_AC03_CPU_38)) - w_set |= HFGxTR_EL2_TCR_EL1_MASK; - - if (vcpu_has_nv(vcpu) && !is_hyp_ctxt(vcpu)) { - compute_clr_set(vcpu, HFGRTR_EL2, r_clr, r_set); - compute_clr_set(vcpu, HFGWTR_EL2, w_clr, w_set); - } - - compute_undef_clr_set(vcpu, kvm, HFGRTR_EL2, r_clr, r_set); - compute_undef_clr_set(vcpu, kvm, HFGWTR_EL2, w_clr, w_set); - - r_val = __HFGRTR_EL2_nMASK; - r_val |= r_set; - r_val &= ~r_clr; - - w_val = __HFGWTR_EL2_nMASK; - w_val |= w_set; - w_val &= ~w_clr; - - write_sysreg_s(r_val, SYS_HFGRTR_EL2); - write_sysreg_s(w_val, SYS_HFGWTR_EL2); - + update_fgt_traps(hctxt, vcpu, kvm, HFGRTR_EL2); + update_fgt_traps_cs(hctxt, vcpu, kvm, HFGWTR_EL2, 0, + cpus_have_final_cap(ARM64_WORKAROUND_AMPERE_AC03_CPU_38) ? + HFGxTR_EL2_TCR_EL1_MASK : 0); update_fgt_traps(hctxt, vcpu, kvm, HFGITR_EL2); update_fgt_traps(hctxt, vcpu, kvm, HDFGRTR_EL2); update_fgt_traps(hctxt, vcpu, kvm, HDFGWTR_EL2); @@ -223,9 +197,11 @@ static inline void __deactivate_traps_hfgxtr(struct kvm_vcpu *vcpu) if (!cpus_have_final_cap(ARM64_HAS_FGT)) return; - write_sysreg_s(ctxt_sys_reg(hctxt, HFGRTR_EL2), SYS_HFGRTR_EL2); - write_sysreg_s(ctxt_sys_reg(hctxt, HFGWTR_EL2), SYS_HFGWTR_EL2); - + __deactivate_fgt(hctxt, vcpu, kvm, HFGRTR_EL2); + if (cpus_have_final_cap(ARM64_WORKAROUND_AMPERE_AC03_CPU_38)) + write_sysreg_s(ctxt_sys_reg(hctxt, HFGWTR_EL2), SYS_HFGWTR_EL2); + else + __deactivate_fgt(hctxt, vcpu, kvm, HFGWTR_EL2); __deactivate_fgt(hctxt, vcpu, kvm, HFGITR_EL2); __deactivate_fgt(hctxt, vcpu, kvm, HDFGRTR_EL2); __deactivate_fgt(hctxt, vcpu, kvm, HDFGWTR_EL2); -- cgit v1.2.3