add new system file

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2024-02-20 102a0743326a03cd1a1202ceda21e175b7d3575c

 kernel/arch/mips/kvm/entry.c
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@@ -56,6 +56,7 @@
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 #define C0_BADVADDR	8, 0
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 #define C0_BADINSTR	8, 1
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 #define C0_BADINSTRP	8, 2
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+#define C0_PGD		9, 7
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 #define C0_ENTRYHI	10, 0
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 #define C0_GUESTCTL1	10, 4
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 #define C0_STATUS	12, 0
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@@ -204,7 +205,7 @@
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  * Assemble the start of the vcpu_run function to run a guest VCPU. The function
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  * conforms to the following prototype:
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  *
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- * int vcpu_run(struct kvm_run *run, struct kvm_vcpu *vcpu);
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+ * int vcpu_run(struct kvm_vcpu *vcpu);
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  *
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  * The exit from the guest and return to the caller is handled by the code
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  * generated by kvm_mips_build_ret_to_host().
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@@ -217,8 +218,7 @@
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 	unsigned int i;
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 	/*
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-	 * A0: run
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-	 * A1: vcpu
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+	 * A0: vcpu
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 	 */
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 	/* k0/k1 not being used in host kernel context */
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@@ -237,10 +237,10 @@
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 	kvm_mips_build_save_scratch(&p, V1, K1);
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 	/* VCPU scratch register has pointer to vcpu */
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-	UASM_i_MTC0(&p, A1, scratch_vcpu[0], scratch_vcpu[1]);
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+	UASM_i_MTC0(&p, A0, scratch_vcpu[0], scratch_vcpu[1]);
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 	/* Offset into vcpu->arch */
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-	UASM_i_ADDIU(&p, K1, A1, offsetof(struct kvm_vcpu, arch));
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+	UASM_i_ADDIU(&p, K1, A0, offsetof(struct kvm_vcpu, arch));
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 	/*
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 	 * Save the host stack to VCPU, used for exception processing
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@@ -307,7 +307,10 @@
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 #ifdef CONFIG_KVM_MIPS_VZ
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 	/* Save normal linux process pgd (VZ guarantees pgd_reg is set) */
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-	UASM_i_MFC0(&p, K0, c0_kscratch(), pgd_reg);
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+	if (cpu_has_ldpte)
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+		UASM_i_MFC0(&p, K0, C0_PWBASE);
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+	else
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+		UASM_i_MFC0(&p, K0, c0_kscratch(), pgd_reg);
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 	UASM_i_SW(&p, K0, offsetof(struct kvm_vcpu_arch, host_pgd), K1);
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 	/*
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@@ -469,8 +472,10 @@
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 	u32 *p = addr;
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 	struct uasm_label labels[2];
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 	struct uasm_reloc relocs[2];
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+#ifndef CONFIG_CPU_LOONGSON64
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 	struct uasm_label *l = labels;
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 	struct uasm_reloc *r = relocs;
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+#endif
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 	memset(labels, 0, sizeof(labels));
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 	memset(relocs, 0, sizeof(relocs));
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@@ -490,6 +495,16 @@
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 	 */
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 	preempt_disable();
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+#ifdef CONFIG_CPU_LOONGSON64
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+	UASM_i_MFC0(&p, K1, C0_PGD);
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+	uasm_i_lddir(&p, K0, K1, 3);  /* global page dir */
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+#ifndef __PAGETABLE_PMD_FOLDED
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+	uasm_i_lddir(&p, K1, K0, 1);  /* middle page dir */
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+#endif
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+	uasm_i_ldpte(&p, K1, 0);      /* even */
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+	uasm_i_ldpte(&p, K1, 1);      /* odd */
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+	uasm_i_tlbwr(&p);
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+#else
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 	/*
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 	 * Now for the actual refill bit. A lot of this can be common with the
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 	 * Linux TLB refill handler, however we don't need to handle so many
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@@ -512,6 +527,7 @@
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 	build_get_ptep(&p, K0, K1);
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 	build_update_entries(&p, K0, K1);
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 	build_tlb_write_entry(&p, &l, &r, tlb_random);
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+#endif
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 	preempt_enable();
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@@ -628,10 +644,7 @@
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 	/* Now that context has been saved, we can use other registers */
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 	/* Restore vcpu */
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-	UASM_i_MFC0(&p, S1, scratch_vcpu[0], scratch_vcpu[1]);
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-
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-	/* Restore run (vcpu->run) */
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-	UASM_i_LW(&p, S0, offsetof(struct kvm_vcpu, run), S1);
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+	UASM_i_MFC0(&p, S0, scratch_vcpu[0], scratch_vcpu[1]);
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 	/*
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 	 * Save Host level EPC, BadVaddr and Cause to VCPU, useful to process
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@@ -793,7 +806,6 @@
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 	 * with this in the kernel
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 	 */
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 	uasm_i_move(&p, A0, S0);
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-	uasm_i_move(&p, A1, S1);
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 	UASM_i_LA(&p, T9, (unsigned long)kvm_mips_handle_exit);
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 	uasm_i_jalr(&p, RA, T9);
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 	 UASM_i_ADDIU(&p, SP, SP, -CALLFRAME_SIZ);
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@@ -835,7 +847,7 @@
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 	 * guest, reload k1
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 	 */
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-	uasm_i_move(&p, K1, S1);
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+	uasm_i_move(&p, K1, S0);
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 	UASM_i_ADDIU(&p, K1, K1, offsetof(struct kvm_vcpu, arch));
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 	/*
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@@ -869,8 +881,8 @@
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 {
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 	u32 *p = addr;
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-	/* Put the saved pointer to vcpu (s1) back into the scratch register */
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-	UASM_i_MTC0(&p, S1, scratch_vcpu[0], scratch_vcpu[1]);
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+	/* Put the saved pointer to vcpu (s0) back into the scratch register */
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+	UASM_i_MTC0(&p, S0, scratch_vcpu[0], scratch_vcpu[1]);
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 	/* Load up the Guest EBASE to minimize the window where BEV is set */
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 	UASM_i_LW(&p, T0, offsetof(struct kvm_vcpu_arch, guest_ebase), K1);