During __guest_enter, save and restore from a new hyp context rather than the host context. This is preparation for separation of the hyp and host context in nVHE.
Signed-off-by: Andrew Scull <[email protected]> --- arch/arm64/include/asm/kvm_hyp.h | 3 ++- arch/arm64/kernel/image-vars.h | 1 + arch/arm64/kvm/arm.c | 10 ++++++++++ arch/arm64/kvm/hyp/entry.S | 10 +++++----- arch/arm64/kvm/hyp/include/hyp/switch.h | 2 +- arch/arm64/kvm/hyp/nvhe/switch.c | 2 +- arch/arm64/kvm/hyp/vhe/switch.c | 2 +- 7 files changed, 21 insertions(+), 9 deletions(-) diff --git a/arch/arm64/include/asm/kvm_hyp.h b/arch/arm64/include/asm/kvm_hyp.h index 1e2491da324e..0b525e05e5bf 100644 --- a/arch/arm64/include/asm/kvm_hyp.h +++ b/arch/arm64/include/asm/kvm_hyp.h @@ -12,6 +12,7 @@ #include <asm/alternative.h> #include <asm/sysreg.h> +DECLARE_PER_CPU(struct kvm_cpu_context, kvm_hyp_ctxt); DECLARE_PER_CPU(unsigned long, kvm_hyp_vector); #define read_sysreg_elx(r,nvh,vh) \ @@ -89,7 +90,7 @@ void activate_traps_vhe_load(struct kvm_vcpu *vcpu); void deactivate_traps_vhe_put(void); #endif -u64 __guest_enter(struct kvm_vcpu *vcpu, struct kvm_cpu_context *host_ctxt); +u64 __guest_enter(struct kvm_vcpu *vcpu); void __noreturn hyp_panic(void); #ifdef __KVM_NVHE_HYPERVISOR__ diff --git a/arch/arm64/kernel/image-vars.h b/arch/arm64/kernel/image-vars.h index 54bb0eb34b0f..9f419e4fc66b 100644 --- a/arch/arm64/kernel/image-vars.h +++ b/arch/arm64/kernel/image-vars.h @@ -71,6 +71,7 @@ KVM_NVHE_ALIAS(kvm_update_va_mask); /* Global kernel state accessed by nVHE hyp code. */ KVM_NVHE_ALIAS(arm64_ssbd_callback_required); KVM_NVHE_ALIAS(kvm_host_data); +KVM_NVHE_ALIAS(kvm_hyp_ctxt); KVM_NVHE_ALIAS(kvm_hyp_vector); KVM_NVHE_ALIAS(kvm_vgic_global_state); diff --git a/arch/arm64/kvm/arm.c b/arch/arm64/kvm/arm.c index b6442c6be5ad..ae4b34f91e94 100644 --- a/arch/arm64/kvm/arm.c +++ b/arch/arm64/kvm/arm.c @@ -47,6 +47,7 @@ __asm__(".arch_extension virt"); #endif DEFINE_PER_CPU(struct kvm_host_data, kvm_host_data); +DEFINE_PER_CPU(struct kvm_cpu_context, kvm_hyp_ctxt); DEFINE_PER_CPU(unsigned long, kvm_hyp_vector); static DEFINE_PER_CPU(unsigned long, kvm_arm_hyp_stack_page); @@ -1542,6 +1543,7 @@ static int init_hyp_mode(void) for_each_possible_cpu(cpu) { struct kvm_host_data *cpu_data; + struct kvm_cpu_context *hyp_ctxt; unsigned long *vector; cpu_data = per_cpu_ptr(&kvm_host_data, cpu); @@ -1552,6 +1554,14 @@ static int init_hyp_mode(void) goto out_err; } + hyp_ctxt = per_cpu_ptr(&kvm_hyp_ctxt, cpu); + err = create_hyp_mappings(hyp_ctxt, hyp_ctxt + 1, PAGE_HYP); + + if (err) { + kvm_err("Cannot map hyp context: %d\n", err); + goto out_err; + } + vector = per_cpu_ptr(&kvm_hyp_vector, cpu); err = create_hyp_mappings(vector, vector + 1, PAGE_HYP); diff --git a/arch/arm64/kvm/hyp/entry.S b/arch/arm64/kvm/hyp/entry.S index 76e7eaf4675e..9551d7f186da 100644 --- a/arch/arm64/kvm/hyp/entry.S +++ b/arch/arm64/kvm/hyp/entry.S @@ -57,15 +57,15 @@ .endm /* - * u64 __guest_enter(struct kvm_vcpu *vcpu, - * struct kvm_cpu_context *host_ctxt); + * u64 __guest_enter(struct kvm_vcpu *vcpu); */ SYM_FUNC_START(__guest_enter) // x0: vcpu - // x1: host context - // x2-x17: clobbered by macros + // x1-x17: clobbered by macros // x29: guest context + hyp_adr_this_cpu x1, kvm_hyp_ctxt, x2 + // Store the host regs save_callee_saved_regs x1 @@ -148,7 +148,7 @@ SYM_INNER_LABEL(__guest_exit, SYM_L_GLOBAL) // Store the guest's sp_el0 save_sp_el0 x1, x2 - get_host_ctxt x2, x3 + hyp_adr_this_cpu x2, kvm_hyp_ctxt, x3 // Macro ptrauth_switch_to_guest format: // ptrauth_switch_to_host(guest cxt, host cxt, tmp1, tmp2, tmp3) diff --git a/arch/arm64/kvm/hyp/include/hyp/switch.h b/arch/arm64/kvm/hyp/include/hyp/switch.h index 96ea3fdd0c20..afe714056b97 100644 --- a/arch/arm64/kvm/hyp/include/hyp/switch.h +++ b/arch/arm64/kvm/hyp/include/hyp/switch.h @@ -381,7 +381,7 @@ static inline bool __hyp_handle_ptrauth(struct kvm_vcpu *vcpu) !esr_is_ptrauth_trap(kvm_vcpu_get_esr(vcpu))) return false; - ctxt = &__hyp_this_cpu_ptr(kvm_host_data)->host_ctxt; + ctxt = __hyp_this_cpu_ptr(kvm_hyp_ctxt); __ptrauth_save_key(ctxt, APIA); __ptrauth_save_key(ctxt, APIB); __ptrauth_save_key(ctxt, APDA); diff --git a/arch/arm64/kvm/hyp/nvhe/switch.c b/arch/arm64/kvm/hyp/nvhe/switch.c index 1ab773bb60ca..72d3e0119299 100644 --- a/arch/arm64/kvm/hyp/nvhe/switch.c +++ b/arch/arm64/kvm/hyp/nvhe/switch.c @@ -209,7 +209,7 @@ int __kvm_vcpu_run(struct kvm_vcpu *vcpu) do { /* Jump in the fire! */ - exit_code = __guest_enter(vcpu, host_ctxt); + exit_code = __guest_enter(vcpu); /* And we're baaack! */ } while (fixup_guest_exit(vcpu, &exit_code)); diff --git a/arch/arm64/kvm/hyp/vhe/switch.c b/arch/arm64/kvm/hyp/vhe/switch.c index 7e99a7183320..ae6b63e45638 100644 --- a/arch/arm64/kvm/hyp/vhe/switch.c +++ b/arch/arm64/kvm/hyp/vhe/switch.c @@ -135,7 +135,7 @@ static int __kvm_vcpu_run_vhe(struct kvm_vcpu *vcpu) do { /* Jump in the fire! */ - exit_code = __guest_enter(vcpu, host_ctxt); + exit_code = __guest_enter(vcpu); /* And we're baaack! */ } while (fixup_guest_exit(vcpu, &exit_code)); -- 2.28.0.402.g5ffc5be6b7-goog _______________________________________________ kvmarm mailing list [email protected] https://lists.cs.columbia.edu/mailman/listinfo/kvmarm
