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arm64: KVM: Implement 32bit system register save/restore

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Implement the 32bit system register save/restore as a direct
translation of the assembly code version.

Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
Reviewed-by: Christoffer Dall <christoffer.dall@linaro.org>
This commit is contained in:
Marc Zyngier 2015-10-19 19:28:29 +01:00
parent 6d6ec20fcf
commit c209ec85a2
2 changed files with 49 additions and 0 deletions
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2
arch/arm64/kvm/hyp/hyp.h
View File

@ -40,6 +40,8 @@ void __timer_restore_state(struct kvm_vcpu *vcpu);
void __sysreg_save_state(struct kvm_cpu_context *ctxt);
void __sysreg_restore_state(struct kvm_cpu_context *ctxt);
void __sysreg32_save_state(struct kvm_vcpu *vcpu);
void __sysreg32_restore_state(struct kvm_vcpu *vcpu);
#endif /* __ARM64_KVM_HYP_H__ */

47
arch/arm64/kvm/hyp/sysreg-sr.c
View File

@ -88,3 +88,50 @@ void __hyp_text __sysreg_restore_state(struct kvm_cpu_context *ctxt)
write_sysreg(ctxt->gp_regs.elr_el1, elr_el1);
write_sysreg(ctxt->gp_regs.spsr[KVM_SPSR_EL1], spsr_el1);
}
void __hyp_text __sysreg32_save_state(struct kvm_vcpu *vcpu)
{
u64 *spsr, *sysreg;
if (read_sysreg(hcr_el2) & HCR_RW)
return;
spsr = vcpu->arch.ctxt.gp_regs.spsr;
sysreg = vcpu->arch.ctxt.sys_regs;
spsr[KVM_SPSR_ABT] = read_sysreg(spsr_abt);
spsr[KVM_SPSR_UND] = read_sysreg(spsr_und);
spsr[KVM_SPSR_IRQ] = read_sysreg(spsr_irq);
spsr[KVM_SPSR_FIQ] = read_sysreg(spsr_fiq);
sysreg[DACR32_EL2] = read_sysreg(dacr32_el2);
sysreg[IFSR32_EL2] = read_sysreg(ifsr32_el2);
if (!(read_sysreg(cptr_el2) & CPTR_EL2_TFP))
sysreg[FPEXC32_EL2] = read_sysreg(fpexc32_el2);
if (vcpu->arch.debug_flags & KVM_ARM64_DEBUG_DIRTY)
sysreg[DBGVCR32_EL2] = read_sysreg(dbgvcr32_el2);
}
void __hyp_text __sysreg32_restore_state(struct kvm_vcpu *vcpu)
{
u64 *spsr, *sysreg;
if (read_sysreg(hcr_el2) & HCR_RW)
return;
spsr = vcpu->arch.ctxt.gp_regs.spsr;
sysreg = vcpu->arch.ctxt.sys_regs;
write_sysreg(spsr[KVM_SPSR_ABT], spsr_abt);
write_sysreg(spsr[KVM_SPSR_UND], spsr_und);
write_sysreg(spsr[KVM_SPSR_IRQ], spsr_irq);
write_sysreg(spsr[KVM_SPSR_FIQ], spsr_fiq);
write_sysreg(sysreg[DACR32_EL2], dacr32_el2);
write_sysreg(sysreg[IFSR32_EL2], ifsr32_el2);
if (vcpu->arch.debug_flags & KVM_ARM64_DEBUG_DIRTY)
write_sysreg(sysreg[DBGVCR32_EL2], dbgvcr32_el2);
}