diff options
Diffstat (limited to 'arch/arm64/kvm')
| -rw-r--r-- | arch/arm64/kvm/guest.c | 2 | ||||
| -rw-r--r-- | arch/arm64/kvm/handle_exit.c | 11 | ||||
| -rw-r--r-- | arch/arm64/kvm/hyp/hyp-entry.S | 9 | ||||
| -rw-r--r-- | arch/arm64/kvm/hyp/switch.c | 5 |
4 files changed, 24 insertions, 3 deletions
diff --git a/arch/arm64/kvm/guest.c b/arch/arm64/kvm/guest.c index 3f9e15722473..b37446a8ffdb 100644 --- a/arch/arm64/kvm/guest.c +++ b/arch/arm64/kvm/guest.c @@ -26,7 +26,7 @@ #include <linux/vmalloc.h> #include <linux/fs.h> #include <asm/cputype.h> -#include <asm/uaccess.h> +#include <linux/uaccess.h> #include <asm/kvm.h> #include <asm/kvm_emulate.h> #include <asm/kvm_coproc.h> diff --git a/arch/arm64/kvm/handle_exit.c b/arch/arm64/kvm/handle_exit.c index a204adf29f0a..1bfe30dfbfe7 100644 --- a/arch/arm64/kvm/handle_exit.c +++ b/arch/arm64/kvm/handle_exit.c @@ -57,6 +57,16 @@ static int handle_smc(struct kvm_vcpu *vcpu, struct kvm_run *run) return 1; } +/* + * Guest access to FP/ASIMD registers are routed to this handler only + * when the system doesn't support FP/ASIMD. + */ +static int handle_no_fpsimd(struct kvm_vcpu *vcpu, struct kvm_run *run) +{ + kvm_inject_undefined(vcpu); + return 1; +} + /** * kvm_handle_wfx - handle a wait-for-interrupts or wait-for-event * instruction executed by a guest @@ -144,6 +154,7 @@ static exit_handle_fn arm_exit_handlers[] = { [ESR_ELx_EC_BREAKPT_LOW]= kvm_handle_guest_debug, [ESR_ELx_EC_BKPT32] = kvm_handle_guest_debug, [ESR_ELx_EC_BRK64] = kvm_handle_guest_debug, + [ESR_ELx_EC_FP_ASIMD] = handle_no_fpsimd, }; static exit_handle_fn kvm_get_exit_handler(struct kvm_vcpu *vcpu) diff --git a/arch/arm64/kvm/hyp/hyp-entry.S b/arch/arm64/kvm/hyp/hyp-entry.S index 4e92399f7105..5e9052f087f2 100644 --- a/arch/arm64/kvm/hyp/hyp-entry.S +++ b/arch/arm64/kvm/hyp/hyp-entry.S @@ -106,9 +106,16 @@ el1_trap: * x0: ESR_EC */ - /* Guest accessed VFP/SIMD registers, save host, restore Guest */ + /* + * We trap the first access to the FP/SIMD to save the host context + * and restore the guest context lazily. + * If FP/SIMD is not implemented, handle the trap and inject an + * undefined instruction exception to the guest. + */ +alternative_if_not ARM64_HAS_NO_FPSIMD cmp x0, #ESR_ELx_EC_FP_ASIMD b.eq __fpsimd_guest_restore +alternative_else_nop_endif mrs x1, tpidr_el2 mov x0, #ARM_EXCEPTION_TRAP diff --git a/arch/arm64/kvm/hyp/switch.c b/arch/arm64/kvm/hyp/switch.c index 0c848c18ca44..75e83dd40d43 100644 --- a/arch/arm64/kvm/hyp/switch.c +++ b/arch/arm64/kvm/hyp/switch.c @@ -21,6 +21,7 @@ #include <asm/kvm_asm.h> #include <asm/kvm_emulate.h> #include <asm/kvm_hyp.h> +#include <asm/fpsimd.h> static bool __hyp_text __fpsimd_enabled_nvhe(void) { @@ -76,9 +77,11 @@ static void __hyp_text __activate_traps(struct kvm_vcpu *vcpu) * traps are only taken to EL2 if the operation would not otherwise * trap to EL1. Therefore, always make sure that for 32-bit guests, * we set FPEXC.EN to prevent traps to EL1, when setting the TFP bit. + * If FP/ASIMD is not implemented, FPEXC is UNDEFINED and any access to + * it will cause an exception. */ val = vcpu->arch.hcr_el2; - if (!(val & HCR_RW)) { + if (!(val & HCR_RW) && system_supports_fpsimd()) { write_sysreg(1 << 30, fpexc32_el2); isb(); } |