From 01573e231f18eb2d99162747186f59511f56b64d Mon Sep 17 00:00:00 2001
From: hc <hc@nodka.com>
Date: Fri, 08 Dec 2023 10:40:48 +0000
Subject: [PATCH] 移去rt
---
kernel/arch/mips/kvm/entry.c | 40 ++++++++++++++++++++++++++--------------
1 files changed, 26 insertions(+), 14 deletions(-)
diff --git a/kernel/arch/mips/kvm/entry.c b/kernel/arch/mips/kvm/entry.c
index 16e1c93..832475b 100644
--- a/kernel/arch/mips/kvm/entry.c
+++ b/kernel/arch/mips/kvm/entry.c
@@ -56,6 +56,7 @@
#define C0_BADVADDR 8, 0
#define C0_BADINSTR 8, 1
#define C0_BADINSTRP 8, 2
+#define C0_PGD 9, 7
#define C0_ENTRYHI 10, 0
#define C0_GUESTCTL1 10, 4
#define C0_STATUS 12, 0
@@ -204,7 +205,7 @@
* Assemble the start of the vcpu_run function to run a guest VCPU. The function
* conforms to the following prototype:
*
- * int vcpu_run(struct kvm_run *run, struct kvm_vcpu *vcpu);
+ * int vcpu_run(struct kvm_vcpu *vcpu);
*
* The exit from the guest and return to the caller is handled by the code
* generated by kvm_mips_build_ret_to_host().
@@ -217,8 +218,7 @@
unsigned int i;
/*
- * A0: run
- * A1: vcpu
+ * A0: vcpu
*/
/* k0/k1 not being used in host kernel context */
@@ -237,10 +237,10 @@
kvm_mips_build_save_scratch(&p, V1, K1);
/* VCPU scratch register has pointer to vcpu */
- UASM_i_MTC0(&p, A1, scratch_vcpu[0], scratch_vcpu[1]);
+ UASM_i_MTC0(&p, A0, scratch_vcpu[0], scratch_vcpu[1]);
/* Offset into vcpu->arch */
- UASM_i_ADDIU(&p, K1, A1, offsetof(struct kvm_vcpu, arch));
+ UASM_i_ADDIU(&p, K1, A0, offsetof(struct kvm_vcpu, arch));
/*
* Save the host stack to VCPU, used for exception processing
@@ -307,7 +307,10 @@
#ifdef CONFIG_KVM_MIPS_VZ
/* Save normal linux process pgd (VZ guarantees pgd_reg is set) */
- UASM_i_MFC0(&p, K0, c0_kscratch(), pgd_reg);
+ if (cpu_has_ldpte)
+ UASM_i_MFC0(&p, K0, C0_PWBASE);
+ else
+ UASM_i_MFC0(&p, K0, c0_kscratch(), pgd_reg);
UASM_i_SW(&p, K0, offsetof(struct kvm_vcpu_arch, host_pgd), K1);
/*
@@ -469,8 +472,10 @@
u32 *p = addr;
struct uasm_label labels[2];
struct uasm_reloc relocs[2];
+#ifndef CONFIG_CPU_LOONGSON64
struct uasm_label *l = labels;
struct uasm_reloc *r = relocs;
+#endif
memset(labels, 0, sizeof(labels));
memset(relocs, 0, sizeof(relocs));
@@ -490,6 +495,16 @@
*/
preempt_disable();
+#ifdef CONFIG_CPU_LOONGSON64
+ UASM_i_MFC0(&p, K1, C0_PGD);
+ uasm_i_lddir(&p, K0, K1, 3); /* global page dir */
+#ifndef __PAGETABLE_PMD_FOLDED
+ uasm_i_lddir(&p, K1, K0, 1); /* middle page dir */
+#endif
+ uasm_i_ldpte(&p, K1, 0); /* even */
+ uasm_i_ldpte(&p, K1, 1); /* odd */
+ uasm_i_tlbwr(&p);
+#else
/*
* Now for the actual refill bit. A lot of this can be common with the
* Linux TLB refill handler, however we don't need to handle so many
@@ -512,6 +527,7 @@
build_get_ptep(&p, K0, K1);
build_update_entries(&p, K0, K1);
build_tlb_write_entry(&p, &l, &r, tlb_random);
+#endif
preempt_enable();
@@ -628,10 +644,7 @@
/* Now that context has been saved, we can use other registers */
/* Restore vcpu */
- UASM_i_MFC0(&p, S1, scratch_vcpu[0], scratch_vcpu[1]);
-
- /* Restore run (vcpu->run) */
- UASM_i_LW(&p, S0, offsetof(struct kvm_vcpu, run), S1);
+ UASM_i_MFC0(&p, S0, scratch_vcpu[0], scratch_vcpu[1]);
/*
* Save Host level EPC, BadVaddr and Cause to VCPU, useful to process
@@ -793,7 +806,6 @@
* with this in the kernel
*/
uasm_i_move(&p, A0, S0);
- uasm_i_move(&p, A1, S1);
UASM_i_LA(&p, T9, (unsigned long)kvm_mips_handle_exit);
uasm_i_jalr(&p, RA, T9);
UASM_i_ADDIU(&p, SP, SP, -CALLFRAME_SIZ);
@@ -835,7 +847,7 @@
* guest, reload k1
*/
- uasm_i_move(&p, K1, S1);
+ uasm_i_move(&p, K1, S0);
UASM_i_ADDIU(&p, K1, K1, offsetof(struct kvm_vcpu, arch));
/*
@@ -869,8 +881,8 @@
{
u32 *p = addr;
- /* Put the saved pointer to vcpu (s1) back into the scratch register */
- UASM_i_MTC0(&p, S1, scratch_vcpu[0], scratch_vcpu[1]);
+ /* Put the saved pointer to vcpu (s0) back into the scratch register */
+ UASM_i_MTC0(&p, S0, scratch_vcpu[0], scratch_vcpu[1]);
/* Load up the Guest EBASE to minimize the window where BEV is set */
UASM_i_LW(&p, T0, offsetof(struct kvm_vcpu_arch, guest_ebase), K1);
--
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