Re: [PATCH v4 31/40] KVM: arm64: Move common VHE/non-VHE trap config in separate functions

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 



Hi Christoffer,

On 15/02/18 21:03, Christoffer Dall wrote:
@@ -85,37 +123,14 @@ static void __hyp_text __activate_traps(struct kvm_vcpu *vcpu)
  {
  	u64 hcr = vcpu->arch.hcr_el2;
- /*
-	 * We are about to set CPTR_EL2.TFP to trap all floating point
-	 * register accesses to EL2, however, the ARM ARM clearly states that
-	 * 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.
-	 */
-	if (vcpu_el1_is_32bit(vcpu) && system_supports_fpsimd()) {
-		write_sysreg(1 << 30, fpexc32_el2);
-		isb();
-	}
+	write_sysreg(hcr, hcr_el2);
if (cpus_have_const_cap(ARM64_HAS_RAS_EXTN) && (hcr & HCR_VSE))
  		write_sysreg_s(vcpu->arch.vsesr_el2, SYS_VSESR_EL2);
- write_sysreg(hcr, hcr_el2);

OOI, any reason to move the write to HCR_EL2 just before the if?

-
-	/* Trap on AArch32 cp15 c15 accesses (EL1 or EL0) */
-	write_sysreg(1 << 15, hstr_el2);
-	/*
-	 * Make sure we trap PMU access from EL0 to EL2. Also sanitize
-	 * PMSELR_EL0 to make sure it never contains the cycle
-	 * counter, which could make a PMXEVCNTR_EL0 access UNDEF at
-	 * EL1 instead of being trapped to EL2.
-	 */
-	write_sysreg(0, pmselr_el0);
-	write_sysreg(ARMV8_PMU_USERENR_MASK, pmuserenr_el0);
-	write_sysreg(vcpu->arch.mdcr_el2, mdcr_el2);
-	__activate_traps_arch()();
+	__activate_traps_fpsimd32(vcpu);
+	__activate_traps_common(vcpu);
+	__activate_traps_arch()(vcpu);
  }
static void __hyp_text __deactivate_traps_vhe(void)
@@ -160,9 +175,8 @@ static void __hyp_text __deactivate_traps(struct kvm_vcpu *vcpu)
  	if (vcpu->arch.hcr_el2 & HCR_VSE)
  		vcpu->arch.hcr_el2 = read_sysreg(hcr_el2);
+ __deactivate_traps_common();
  	__deactivate_traps_arch()();
-	write_sysreg(0, hstr_el2);
-	write_sysreg(0, pmuserenr_el0);
  }
static void __hyp_text __activate_vm(struct kvm *kvm)


Cheers,

--
Julien Grall



[Index of Archives]     [KVM ARM]     [KVM ia64]     [KVM ppc]     [Virtualization Tools]     [Spice Development]     [Libvirt]     [Libvirt Users]     [Linux USB Devel]     [Linux Audio Users]     [Yosemite Questions]     [Linux Kernel]     [Linux SCSI]     [XFree86]

  Powered by Linux