KVM: MIPS/VZ: Emulate MAARs when necessary (d42a008f) · Commits · 戴 / test

Documentation/virtual/kvm/api.txt

+5 −0

Original line number	Diff line number	Diff line
		@@ -2114,6 +2114,7 @@ registers, find a list below:
		MIPS \| KVM_REG_MIPS_CP0_KSCRATCH4 \| 64
		MIPS \| KVM_REG_MIPS_CP0_KSCRATCH5 \| 64
		MIPS \| KVM_REG_MIPS_CP0_KSCRATCH6 \| 64
		MIPS \| KVM_REG_MIPS_CP0_MAAR(0..63) \| 64
		MIPS \| KVM_REG_MIPS_COUNT_CTL \| 64
		MIPS \| KVM_REG_MIPS_COUNT_RESUME \| 64
		MIPS \| KVM_REG_MIPS_COUNT_HZ \| 64
		@@ -2180,6 +2181,10 @@ hardware, host kernel, guest, and whether XPA is present in the guest, i.e.
		with the RI and XI bits (if they exist) in bits 63 and 62 respectively, and
		the PFNX field starting at bit 30.

		MIPS MAARs (see KVM_REG_MIPS_CP0_MAAR(*) above) have the following id bit
		patterns:
		0x7030 0000 0001 01 <reg:8>

		MIPS KVM control registers (see above) have the following id bit patterns:
		0x7030 0000 0002 <reg:16>

arch/mips/include/asm/kvm_host.h

+5 −0

Original line number	Diff line number	Diff line
		@@ -67,6 +67,7 @@
		#define KVM_REG_MIPS_CP0_CONFIG4 MIPS_CP0_32(16, 4)
		#define KVM_REG_MIPS_CP0_CONFIG5 MIPS_CP0_32(16, 5)
		#define KVM_REG_MIPS_CP0_CONFIG7 MIPS_CP0_32(16, 7)
		#define KVM_REG_MIPS_CP0_MAARI MIPS_CP0_64(17, 2)
		#define KVM_REG_MIPS_CP0_XCONTEXT MIPS_CP0_64(20, 0)
		#define KVM_REG_MIPS_CP0_ERROREPC MIPS_CP0_64(30, 0)
		#define KVM_REG_MIPS_CP0_KSCRATCH1 MIPS_CP0_64(31, 2)
		@@ -388,6 +389,9 @@ struct kvm_vcpu_arch {
		struct kvm_mips_tlb *wired_tlb;
		unsigned int wired_tlb_limit;
		unsigned int wired_tlb_used;

		/* emulated guest MAAR registers */
		unsigned long maar[6];
		#endif

		/* Last CPU the VCPU state was loaded on */
		@@ -708,6 +712,7 @@ __BUILD_KVM_RW_HW(config4, 32, MIPS_CP0_CONFIG, 4)
		__BUILD_KVM_RW_HW(config5, 32, MIPS_CP0_CONFIG, 5)
		__BUILD_KVM_RW_HW(config6, 32, MIPS_CP0_CONFIG, 6)
		__BUILD_KVM_RW_HW(config7, 32, MIPS_CP0_CONFIG, 7)
		__BUILD_KVM_RW_SW(maari, l, MIPS_CP0_LLADDR, 2)
		__BUILD_KVM_RW_HW(xcontext, l, MIPS_CP0_TLB_XCONTEXT, 0)
		__BUILD_KVM_RW_HW(errorepc, l, MIPS_CP0_ERROR_PC, 0)
		__BUILD_KVM_RW_HW(kscratch1, l, MIPS_CP0_DESAVE, 2)

arch/mips/include/uapi/asm/kvm.h

+17 −3

Original line number	Diff line number	Diff line
		@@ -54,10 +54,15 @@ struct kvm_fpu {
		* Register set = 0: GP registers from kvm_regs (see definitions below).
		*
		* Register set = 1: CP0 registers.
		* bits[15..8] - Must be zero.
		* bits[15..8] - COP0 register set.
		*
		* COP0 register set = 0: Main CP0 registers.
		* bits[7..3] - Register 'rd' index.
		* bits[2..0] - Register 'sel' index.
		*
		* COP0 register set = 1: MAARs.
		* bits[7..0] - MAAR index.
		*
		* Register set = 2: KVM specific registers (see definitions below).
		*
		* Register set = 3: FPU / MSA registers (see definitions below).
		@@ -114,6 +119,15 @@ struct kvm_fpu {
		#define KVM_REG_MIPS_PC (KVM_REG_MIPS_GP \| KVM_REG_SIZE_U64 \| 34)


		/*
		* KVM_REG_MIPS_CP0 - Coprocessor 0 registers.
		*/

		#define KVM_REG_MIPS_MAAR (KVM_REG_MIPS_CP0 \| (1 << 8))
		#define KVM_REG_MIPS_CP0_MAAR(n) (KVM_REG_MIPS_MAAR \| \
		KVM_REG_SIZE_U64 \| (n))


		/*
		* KVM_REG_MIPS_KVM - KVM specific control registers.
		*/

arch/mips/kvm/trace.h

+2 −0

Original line number	Diff line number	Diff line
		@@ -176,6 +176,8 @@ TRACE_EVENT(kvm_exit,
		{ KVM_TRACE_COP0(16, 4), "Config4" }, \
		{ KVM_TRACE_COP0(16, 5), "Config5" }, \
		{ KVM_TRACE_COP0(16, 7), "Config7" }, \
		{ KVM_TRACE_COP0(17, 1), "MAAR" }, \
		{ KVM_TRACE_COP0(17, 2), "MAARI" }, \
		{ KVM_TRACE_COP0(26, 0), "ECC" }, \
		{ KVM_TRACE_COP0(30, 0), "ErrorEPC" }, \
		{ KVM_TRACE_COP0(31, 2), "KScratch1" }, \

arch/mips/kvm/vz.c

+108 −2

Original line number	Diff line number	Diff line
		@@ -134,7 +134,7 @@ static inline unsigned int kvm_vz_config5_guest_wrmask(struct kvm_vcpu *vcpu)
		* Config3: M, MSAP, [BPG], ULRI, [DSP2P, DSPP], CTXTC, [ITL, LPA, VEIC,
		* VInt, SP, CDMM, MT, SM, TL]
		* Config4: M, [VTLBSizeExt, MMUSizeExt]
		* Config5: [MRP]
		* Config5: MRP
		*/

		static inline unsigned int kvm_vz_config_user_wrmask(struct kvm_vcpu *vcpu)
		@@ -177,7 +177,7 @@ static inline unsigned int kvm_vz_config4_user_wrmask(struct kvm_vcpu *vcpu)

		static inline unsigned int kvm_vz_config5_user_wrmask(struct kvm_vcpu *vcpu)
		{
		return kvm_vz_config5_guest_wrmask(vcpu);
		return kvm_vz_config5_guest_wrmask(vcpu) \| MIPS_CONF5_MRP;
		}

		static gpa_t kvm_vz_gva_to_gpa_cb(gva_t gva)
		@@ -685,6 +685,41 @@ static int kvm_trap_vz_no_handler(struct kvm_vcpu *vcpu)
		return RESUME_HOST;
		}

		static unsigned long mips_process_maar(unsigned int op, unsigned long val)
		{
		/* Mask off unused bits */
		unsigned long mask = 0xfffff000 \| MIPS_MAAR_S \| MIPS_MAAR_VL;

		if (read_gc0_pagegrain() & PG_ELPA)
		mask \|= 0x00ffffff00000000ull;
		if (cpu_guest_has_mvh)
		mask \|= MIPS_MAAR_VH;

		/* Set or clear VH */
		if (op == mtc_op) {
		/* clear VH */
		val &= ~MIPS_MAAR_VH;
		} else if (op == dmtc_op) {
		/* set VH to match VL */
		val &= ~MIPS_MAAR_VH;
		if (val & MIPS_MAAR_VL)
		val \|= MIPS_MAAR_VH;
		}

		return val & mask;
		}

		static void kvm_write_maari(struct kvm_vcpu *vcpu, unsigned long val)
		{
		struct mips_coproc *cop0 = vcpu->arch.cop0;

		val &= MIPS_MAARI_INDEX;
		if (val == MIPS_MAARI_INDEX)
		kvm_write_sw_gc0_maari(cop0, ARRAY_SIZE(vcpu->arch.maar) - 1);
		else if (val < ARRAY_SIZE(vcpu->arch.maar))
		kvm_write_sw_gc0_maari(cop0, val);
		}

		static enum emulation_result kvm_vz_gpsi_cop0(union mips_instruction inst,
		u32 *opc, u32 cause,
		struct kvm_run *run,
		@@ -737,6 +772,15 @@ static enum emulation_result kvm_vz_gpsi_cop0(union mips_instruction inst,
		MIPS_LLADDR_LLB;
		else
		val = 0;
		} else if (rd == MIPS_CP0_LLADDR &&
		sel == 1 && /* MAAR */
		cpu_guest_has_maar &&
		!cpu_guest_has_dyn_maar) {
		/* MAARI must be in range */
		BUG_ON(kvm_read_sw_gc0_maari(cop0) >=
		ARRAY_SIZE(vcpu->arch.maar));
		val = vcpu->arch.maar[
		kvm_read_sw_gc0_maari(cop0)];
		} else if ((rd == MIPS_CP0_PRID &&
		(sel == 0 \|\| /* PRid */
		sel == 2 \|\| /* CDMMBase */
		@@ -746,6 +790,10 @@ static enum emulation_result kvm_vz_gpsi_cop0(union mips_instruction inst,
		sel == 3)) \|\| /* SRSMap */
		(rd == MIPS_CP0_CONFIG &&
		(sel == 7)) \|\| /* Config7 */
		(rd == MIPS_CP0_LLADDR &&
		(sel == 2) && /* MAARI */
		cpu_guest_has_maar &&
		!cpu_guest_has_dyn_maar) \|\|
		(rd == MIPS_CP0_ERRCTL &&
		(sel == 0))) { /* ErrCtl */
		val = cop0->reg[rd][sel];
		@@ -793,6 +841,23 @@ static enum emulation_result kvm_vz_gpsi_cop0(union mips_instruction inst,
		if (cpu_guest_has_rw_llb &&
		!(val & MIPS_LLADDR_LLB))
		write_gc0_lladdr(0);
		} else if (rd == MIPS_CP0_LLADDR &&
		sel == 1 && /* MAAR */
		cpu_guest_has_maar &&
		!cpu_guest_has_dyn_maar) {
		val = mips_process_maar(inst.c0r_format.rs,
		val);

		/* MAARI must be in range */
		BUG_ON(kvm_read_sw_gc0_maari(cop0) >=
		ARRAY_SIZE(vcpu->arch.maar));
		vcpu->arch.maar[kvm_read_sw_gc0_maari(cop0)] =
		val;
		} else if (rd == MIPS_CP0_LLADDR &&
		(sel == 2) && /* MAARI */
		cpu_guest_has_maar &&
		!cpu_guest_has_dyn_maar) {
		kvm_write_maari(vcpu, val);
		} else if (rd == MIPS_CP0_ERRCTL &&
		(sel == 0)) { /* ErrCtl */
		/* ignore the written value */
		@@ -1441,6 +1506,8 @@ static unsigned long kvm_vz_num_regs(struct kvm_vcpu *vcpu)
		ret += ARRAY_SIZE(kvm_vz_get_one_regs_segments);
		if (cpu_guest_has_htw)
		ret += ARRAY_SIZE(kvm_vz_get_one_regs_htw);
		if (cpu_guest_has_maar && !cpu_guest_has_dyn_maar)
		ret += 1 + ARRAY_SIZE(vcpu->arch.maar);
		ret += __arch_hweight8(cpu_data[0].guest.kscratch_mask);

		return ret;
		@@ -1492,6 +1559,19 @@ static int kvm_vz_copy_reg_indices(struct kvm_vcpu vcpu, u64 __user indices)
		return -EFAULT;
		indices += ARRAY_SIZE(kvm_vz_get_one_regs_htw);
		}
		if (cpu_guest_has_maar && !cpu_guest_has_dyn_maar) {
		for (i = 0; i < ARRAY_SIZE(vcpu->arch.maar); ++i) {
		index = KVM_REG_MIPS_CP0_MAAR(i);
		if (copy_to_user(indices, &index, sizeof(index)))
		return -EFAULT;
		++indices;
		}

		index = KVM_REG_MIPS_CP0_MAARI;
		if (copy_to_user(indices, &index, sizeof(index)))
		return -EFAULT;
		++indices;
		}
		for (i = 0; i < 6; ++i) {
		if (!cpu_guest_has_kscr(i + 2))
		continue;
		@@ -1689,6 +1769,19 @@ static int kvm_vz_get_one_reg(struct kvm_vcpu *vcpu,
		return -EINVAL;
		*v = read_gc0_config5();
		break;
		case KVM_REG_MIPS_CP0_MAAR(0) ... KVM_REG_MIPS_CP0_MAAR(0x3f):
		if (!cpu_guest_has_maar \|\| cpu_guest_has_dyn_maar)
		return -EINVAL;
		idx = reg->id - KVM_REG_MIPS_CP0_MAAR(0);
		if (idx >= ARRAY_SIZE(vcpu->arch.maar))
		return -EINVAL;
		*v = vcpu->arch.maar[idx];
		break;
		case KVM_REG_MIPS_CP0_MAARI:
		if (!cpu_guest_has_maar \|\| cpu_guest_has_dyn_maar)
		return -EINVAL;
		*v = kvm_read_sw_gc0_maari(vcpu->arch.cop0);
		break;
		#ifdef CONFIG_64BIT
		case KVM_REG_MIPS_CP0_XCONTEXT:
		*v = read_gc0_xcontext();
		@@ -1938,6 +2031,19 @@ static int kvm_vz_set_one_reg(struct kvm_vcpu *vcpu,
		write_gc0_config5(v);
		}
		break;
		case KVM_REG_MIPS_CP0_MAAR(0) ... KVM_REG_MIPS_CP0_MAAR(0x3f):
		if (!cpu_guest_has_maar \|\| cpu_guest_has_dyn_maar)
		return -EINVAL;
		idx = reg->id - KVM_REG_MIPS_CP0_MAAR(0);
		if (idx >= ARRAY_SIZE(vcpu->arch.maar))
		return -EINVAL;
		vcpu->arch.maar[idx] = mips_process_maar(dmtc_op, v);
		break;
		case KVM_REG_MIPS_CP0_MAARI:
		if (!cpu_guest_has_maar \|\| cpu_guest_has_dyn_maar)
		return -EINVAL;
		kvm_write_maari(vcpu, v);
		break;
		#ifdef CONFIG_64BIT
		case KVM_REG_MIPS_CP0_XCONTEXT:
		write_gc0_xcontext(v);

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