diff options
Diffstat (limited to 'arch/mips/kvm/entry.c')
| -rw-r--r-- | arch/mips/kvm/entry.c | 37 |
1 files changed, 15 insertions, 22 deletions
diff --git a/arch/mips/kvm/entry.c b/arch/mips/kvm/entry.c index fb2cbf653474..de8b6ec5573f 100644 --- a/arch/mips/kvm/entry.c +++ b/arch/mips/kvm/entry.c @@ -347,17 +347,15 @@ void *kvm_mips_build_exception(void *addr, void *handler) memset(labels, 0, sizeof(labels)); memset(relocs, 0, sizeof(relocs)); - /* Save guest k0 */ - uasm_i_mtc0(&p, K0, scratch_tmp[0], scratch_tmp[1]); - uasm_i_ehb(&p); + /* Save guest k1 into scratch register */ + uasm_i_mtc0(&p, K1, scratch_tmp[0], scratch_tmp[1]); - /* Get EBASE */ - uasm_i_mfc0(&p, K0, C0_EBASE); - /* Get rid of CPUNum */ - uasm_i_srl(&p, K0, K0, 10); - uasm_i_sll(&p, K0, K0, 10); - /* Save k1 @ offset 0x3000 */ - UASM_i_SW(&p, K1, 0x3000, K0); + /* Get the VCPU pointer from the VCPU scratch register */ + uasm_i_mfc0(&p, K1, scratch_vcpu[0], scratch_vcpu[1]); + uasm_i_addiu(&p, K1, K1, offsetof(struct kvm_vcpu, arch)); + + /* Save guest k0 into VCPU structure */ + UASM_i_SW(&p, K0, offsetof(struct kvm_vcpu_arch, gprs[K0]), K1); /* Branch to the common handler */ uasm_il_b(&p, &r, label_exit_common); @@ -395,12 +393,13 @@ void *kvm_mips_build_exit(void *addr) /* * Generic Guest exception handler. We end up here when the guest * does something that causes a trap to kernel mode. + * + * Both k0/k1 registers will have already been saved (k0 into the vcpu + * structure, and k1 into the scratch_tmp register). + * + * The k1 register will already contain the kvm_vcpu_arch pointer. */ - /* Get the VCPU pointer from the scratch register */ - uasm_i_mfc0(&p, K1, scratch_vcpu[0], scratch_vcpu[1]); - uasm_i_addiu(&p, K1, K1, offsetof(struct kvm_vcpu, arch)); - /* Start saving Guest context to VCPU */ for (i = 0; i < 32; ++i) { /* Guest k0/k1 saved later */ @@ -416,15 +415,9 @@ void *kvm_mips_build_exit(void *addr) uasm_i_mflo(&p, T0); UASM_i_SW(&p, T0, offsetof(struct kvm_vcpu_arch, lo), K1); - /* Finally save guest k0/k1 to VCPU */ + /* Finally save guest k1 to VCPU */ + uasm_i_ehb(&p); uasm_i_mfc0(&p, T0, scratch_tmp[0], scratch_tmp[1]); - UASM_i_SW(&p, T0, offsetof(struct kvm_vcpu_arch, gprs[K0]), K1); - - /* Get GUEST k1 and save it in VCPU */ - uasm_i_addiu(&p, T1, ZERO, ~0x2ff); - uasm_i_mfc0(&p, T0, C0_EBASE); - uasm_i_and(&p, T0, T0, T1); - UASM_i_LW(&p, T0, 0x3000, T0); UASM_i_SW(&p, T0, offsetof(struct kvm_vcpu_arch, gprs[K1]), K1); /* Now that context has been saved, we can use other registers */ |