Re: [PATCH 06/18] KVM/MIPS32-VZ: VZ-ASE related callbacks to handle guest exceptions that trap to the Root context.

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Il 19/05/2013 07:47, Sanjay Lal ha scritto:
> +static int kvm_vz_ioctl_set_regs(struct kvm_vcpu *vcpu, struct kvm_regs *regs)
> +{
> +	struct mips_coproc *cop0 = vcpu->arch.cop0;
> +
> +	/* some registers are not restored
> +	 * random, count        : read-only
> +	 * userlocal            : not implemented in qemu
> +	 * config6              : not implemented in processor variant
> +	 * compare, cause       : defer to kvm_vz_restore_guest_timer_int
> +	 */
> +
> +	kvm_write_c0_guest_index(cop0, regs->cp0reg[MIPS_CP0_TLB_INDEX][0]);
> +	kvm_write_c0_guest_entrylo0(cop0, regs->cp0reg[MIPS_CP0_TLB_LO0][0]);
> +	kvm_write_c0_guest_entrylo1(cop0, regs->cp0reg[MIPS_CP0_TLB_LO1][0]);
> +	kvm_write_c0_guest_context(cop0, regs->cp0reg[MIPS_CP0_TLB_CONTEXT][0]);
> +	kvm_write_c0_guest_pagemask(cop0,
> +				    regs->cp0reg[MIPS_CP0_TLB_PG_MASK][0]);
> +	kvm_write_c0_guest_pagegrain(cop0,
> +				     regs->cp0reg[MIPS_CP0_TLB_PG_MASK][1]);
> +	kvm_write_c0_guest_wired(cop0, regs->cp0reg[MIPS_CP0_TLB_WIRED][0]);
> +	kvm_write_c0_guest_hwrena(cop0, regs->cp0reg[MIPS_CP0_HWRENA][0]);
> +	kvm_write_c0_guest_badvaddr(cop0, regs->cp0reg[MIPS_CP0_BAD_VADDR][0]);
> +	/* skip kvm_write_c0_guest_count */
> +	kvm_write_c0_guest_entryhi(cop0, regs->cp0reg[MIPS_CP0_TLB_HI][0]);
> +	/* defer kvm_write_c0_guest_compare */
> +	kvm_write_c0_guest_status(cop0, regs->cp0reg[MIPS_CP0_STATUS][0]);
> +	kvm_write_c0_guest_intctl(cop0, regs->cp0reg[MIPS_CP0_STATUS][1]);
> +	/* defer kvm_write_c0_guest_cause */
> +	kvm_write_c0_guest_epc(cop0, regs->cp0reg[MIPS_CP0_EXC_PC][0]);
> +	kvm_write_c0_guest_prid(cop0, regs->cp0reg[MIPS_CP0_PRID][0]);
> +	kvm_write_c0_guest_ebase(cop0, regs->cp0reg[MIPS_CP0_PRID][1]);
> +
> +	/* only restore implemented config registers */
> +	kvm_write_c0_guest_config(cop0, regs->cp0reg[MIPS_CP0_CONFIG][0]);
> +
> +	if ((regs->cp0reg[MIPS_CP0_CONFIG][0] & MIPS_CONF_M) &
> +			cpu_vz_has_config1)
> +		kvm_write_c0_guest_config1(cop0,
> +				regs->cp0reg[MIPS_CP0_CONFIG][1]);
> +
> +	if ((regs->cp0reg[MIPS_CP0_CONFIG][1] & MIPS_CONF_M) &
> +			cpu_vz_has_config2)
> +		kvm_write_c0_guest_config2(cop0,
> +				regs->cp0reg[MIPS_CP0_CONFIG][2]);
> +
> +	if ((regs->cp0reg[MIPS_CP0_CONFIG][2] & MIPS_CONF_M) &
> +			cpu_vz_has_config3)
> +		kvm_write_c0_guest_config3(cop0,
> +				regs->cp0reg[MIPS_CP0_CONFIG][3]);
> +
> +	if ((regs->cp0reg[MIPS_CP0_CONFIG][3] & MIPS_CONF_M) &
> +			cpu_vz_has_config4)
> +		kvm_write_c0_guest_config4(cop0,
> +				regs->cp0reg[MIPS_CP0_CONFIG][4]);
> +
> +	if ((regs->cp0reg[MIPS_CP0_CONFIG][4] & MIPS_CONF_M) &
> +			cpu_vz_has_config5)
> +		kvm_write_c0_guest_config5(cop0,
> +				regs->cp0reg[MIPS_CP0_CONFIG][5]);
> +
> +	if (cpu_vz_has_config6)
> +		kvm_write_c0_guest_config6(cop0,
> +				regs->cp0reg[MIPS_CP0_CONFIG][6]);
> +	if (cpu_vz_has_config7)
> +		kvm_write_c0_guest_config7(cop0,
> +				regs->cp0reg[MIPS_CP0_CONFIG][7]);
> +
> +	kvm_write_c0_guest_errorepc(cop0, regs->cp0reg[MIPS_CP0_ERROR_PC][0]);
> +
> +	/* call after setting MIPS_CP0_CAUSE to avoid having it overwritten
> +	 * this will set guest compare and cause.TI if necessary
> +	 */
> +	kvm_vz_restore_guest_timer_int(vcpu, regs);
> +
> +	return 0;
> +}

All this is now obsolete after David's patches (reusing kvm_regs looked
a bit strange in fact).

Paolo
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