From: Jintack Lim Date: Tue, 25 Feb 2025 17:29:25 +0000 (+0000) Subject: KVM: arm64: nv: Respect virtual HCR_EL2.TWx setting X-Git-Tag: v6.15-rc1~195^2~2^2~6^2~5 X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=69c9176c3862345850b7fecbe2546bfd051dc7da;p=thirdparty%2Fkernel%2Flinux.git KVM: arm64: nv: Respect virtual HCR_EL2.TWx setting Forward exceptions due to WFI or WFE instructions to the virtual EL2 if they are not coming from the virtual EL2 and virtual HCR_EL2.TWx is set. Signed-off-by: Jintack Lim Signed-off-by: Marc Zyngier Link: https://lore.kernel.org/r/20250225172930.1850838-12-maz@kernel.org Signed-off-by: Oliver Upton --- diff --git a/arch/arm64/include/asm/kvm_emulate.h b/arch/arm64/include/asm/kvm_emulate.h index 78ec1ef2cfe82..d4e4212ff5967 100644 --- a/arch/arm64/include/asm/kvm_emulate.h +++ b/arch/arm64/include/asm/kvm_emulate.h @@ -275,6 +275,19 @@ static __always_inline u64 kvm_vcpu_get_esr(const struct kvm_vcpu *vcpu) return vcpu->arch.fault.esr_el2; } +static inline bool guest_hyp_wfx_traps_enabled(const struct kvm_vcpu *vcpu) +{ + u64 esr = kvm_vcpu_get_esr(vcpu); + bool is_wfe = !!(esr & ESR_ELx_WFx_ISS_WFE); + u64 hcr_el2 = __vcpu_sys_reg(vcpu, HCR_EL2); + + if (!vcpu_has_nv(vcpu) || vcpu_is_el2(vcpu)) + return false; + + return ((is_wfe && (hcr_el2 & HCR_TWE)) || + (!is_wfe && (hcr_el2 & HCR_TWI))); +} + static __always_inline int kvm_vcpu_get_condition(const struct kvm_vcpu *vcpu) { u64 esr = kvm_vcpu_get_esr(vcpu); diff --git a/arch/arm64/kvm/handle_exit.c b/arch/arm64/kvm/handle_exit.c index 512d152233ff2..b73dc26bc44b4 100644 --- a/arch/arm64/kvm/handle_exit.c +++ b/arch/arm64/kvm/handle_exit.c @@ -129,8 +129,12 @@ static int kvm_handle_fpasimd(struct kvm_vcpu *vcpu) static int kvm_handle_wfx(struct kvm_vcpu *vcpu) { u64 esr = kvm_vcpu_get_esr(vcpu); + bool is_wfe = !!(esr & ESR_ELx_WFx_ISS_WFE); - if (esr & ESR_ELx_WFx_ISS_WFE) { + if (guest_hyp_wfx_traps_enabled(vcpu)) + return kvm_inject_nested_sync(vcpu, kvm_vcpu_get_esr(vcpu)); + + if (is_wfe) { trace_kvm_wfx_arm64(*vcpu_pc(vcpu), true); vcpu->stat.wfe_exit_stat++; } else {