diff options
| -rw-r--r-- | arch/mips/include/asm/kvm_host.h | 5 | ||||
| -rw-r--r-- | arch/mips/kvm/entry.c | 132 | ||||
| -rw-r--r-- | arch/mips/kvm/mips.c | 4 |
3 files changed, 131 insertions, 10 deletions
diff --git a/arch/mips/include/asm/kvm_host.h b/arch/mips/include/asm/kvm_host.h index cd7488641db8..c52279d89ae4 100644 --- a/arch/mips/include/asm/kvm_host.h +++ b/arch/mips/include/asm/kvm_host.h @@ -287,13 +287,18 @@ struct kvm_mmu_memory_cache { struct kvm_vcpu_arch { void *guest_ebase; int (*vcpu_run)(struct kvm_run *run, struct kvm_vcpu *vcpu); + + /* Host registers preserved across guest mode execution */ unsigned long host_stack; unsigned long host_gp; + unsigned long host_pgd; + unsigned long host_entryhi; /* Host CP0 registers used when handling exits from guest */ unsigned long host_cp0_badvaddr; unsigned long host_cp0_epc; u32 host_cp0_cause; + u32 host_cp0_guestctl0; u32 host_cp0_badinstr; u32 host_cp0_badinstrp; diff --git a/arch/mips/kvm/entry.c b/arch/mips/kvm/entry.c index c5b254c4d0da..16e1c93b484f 100644 --- a/arch/mips/kvm/entry.c +++ b/arch/mips/kvm/entry.c @@ -51,12 +51,15 @@ #define RA 31 /* Some CP0 registers */ +#define C0_PWBASE 5, 5 #define C0_HWRENA 7, 0 #define C0_BADVADDR 8, 0 #define C0_BADINSTR 8, 1 #define C0_BADINSTRP 8, 2 #define C0_ENTRYHI 10, 0 +#define C0_GUESTCTL1 10, 4 #define C0_STATUS 12, 0 +#define C0_GUESTCTL0 12, 6 #define C0_CAUSE 13, 0 #define C0_EPC 14, 0 #define C0_EBASE 15, 1 @@ -292,8 +295,8 @@ static void *kvm_mips_build_enter_guest(void *addr) unsigned int i; struct uasm_label labels[2]; struct uasm_reloc relocs[2]; - struct uasm_label *l = labels; - struct uasm_reloc *r = relocs; + struct uasm_label __maybe_unused *l = labels; + struct uasm_reloc __maybe_unused *r = relocs; memset(labels, 0, sizeof(labels)); memset(relocs, 0, sizeof(relocs)); @@ -302,7 +305,67 @@ static void *kvm_mips_build_enter_guest(void *addr) UASM_i_LW(&p, T0, offsetof(struct kvm_vcpu_arch, pc), K1); UASM_i_MTC0(&p, T0, C0_EPC); - /* Set the ASID for the Guest Kernel */ +#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); + UASM_i_SW(&p, K0, offsetof(struct kvm_vcpu_arch, host_pgd), K1); + + /* + * Set up KVM GPA pgd. + * This does roughly the same as TLBMISS_HANDLER_SETUP_PGD(): + * - call tlbmiss_handler_setup_pgd(mm->pgd) + * - write mm->pgd into CP0_PWBase + * + * We keep S0 pointing at struct kvm so we can load the ASID below. + */ + UASM_i_LW(&p, S0, (int)offsetof(struct kvm_vcpu, kvm) - + (int)offsetof(struct kvm_vcpu, arch), K1); + UASM_i_LW(&p, A0, offsetof(struct kvm, arch.gpa_mm.pgd), S0); + UASM_i_LA(&p, T9, (unsigned long)tlbmiss_handler_setup_pgd); + uasm_i_jalr(&p, RA, T9); + /* delay slot */ + if (cpu_has_htw) + UASM_i_MTC0(&p, A0, C0_PWBASE); + else + uasm_i_nop(&p); + + /* Set GM bit to setup eret to VZ guest context */ + uasm_i_addiu(&p, V1, ZERO, 1); + uasm_i_mfc0(&p, K0, C0_GUESTCTL0); + uasm_i_ins(&p, K0, V1, MIPS_GCTL0_GM_SHIFT, 1); + uasm_i_mtc0(&p, K0, C0_GUESTCTL0); + + if (cpu_has_guestid) { + /* + * Set root mode GuestID, so that root TLB refill handler can + * use the correct GuestID in the root TLB. + */ + + /* Get current GuestID */ + uasm_i_mfc0(&p, T0, C0_GUESTCTL1); + /* Set GuestCtl1.RID = GuestCtl1.ID */ + uasm_i_ext(&p, T1, T0, MIPS_GCTL1_ID_SHIFT, + MIPS_GCTL1_ID_WIDTH); + uasm_i_ins(&p, T0, T1, MIPS_GCTL1_RID_SHIFT, + MIPS_GCTL1_RID_WIDTH); + uasm_i_mtc0(&p, T0, C0_GUESTCTL1); + + /* GuestID handles dealiasing so we don't need to touch ASID */ + goto skip_asid_restore; + } + + /* Root ASID Dealias (RAD) */ + + /* Save host ASID */ + UASM_i_MFC0(&p, K0, C0_ENTRYHI); + UASM_i_SW(&p, K0, offsetof(struct kvm_vcpu_arch, host_entryhi), + K1); + + /* Set the root ASID for the Guest */ + UASM_i_ADDIU(&p, T1, S0, + offsetof(struct kvm, arch.gpa_mm.context.asid)); +#else + /* Set the ASID for the Guest Kernel or User */ UASM_i_LW(&p, T0, offsetof(struct kvm_vcpu_arch, cop0), K1); UASM_i_LW(&p, T0, offsetof(struct mips_coproc, reg[MIPS_CP0_STATUS][0]), T0); @@ -315,6 +378,7 @@ static void *kvm_mips_build_enter_guest(void *addr) UASM_i_ADDIU(&p, T1, K1, offsetof(struct kvm_vcpu_arch, guest_user_mm.context.asid)); uasm_l_kernel_asid(&l, p); +#endif /* t1: contains the base of the ASID array, need to get the cpu id */ /* smp_processor_id */ @@ -339,6 +403,7 @@ static void *kvm_mips_build_enter_guest(void *addr) uasm_i_andi(&p, K0, K0, MIPS_ENTRYHI_ASID); #endif +#ifndef CONFIG_KVM_MIPS_VZ /* * Set up KVM T&E GVA pgd. * This does roughly the same as TLBMISS_HANDLER_SETUP_PGD(): @@ -351,7 +416,11 @@ static void *kvm_mips_build_enter_guest(void *addr) UASM_i_LA(&p, T9, (unsigned long)tlbmiss_handler_setup_pgd); uasm_i_jalr(&p, RA, T9); uasm_i_mtc0(&p, K0, C0_ENTRYHI); - +#else + /* Set up KVM VZ root ASID (!guestid) */ + uasm_i_mtc0(&p, K0, C0_ENTRYHI); +skip_asid_restore: +#endif uasm_i_ehb(&p); /* Disable RDHWR access */ @@ -559,13 +628,10 @@ void *kvm_mips_build_exit(void *addr) /* Now that context has been saved, we can use other registers */ /* Restore vcpu */ - UASM_i_MFC0(&p, A1, scratch_vcpu[0], scratch_vcpu[1]); - uasm_i_move(&p, S1, A1); + UASM_i_MFC0(&p, S1, scratch_vcpu[0], scratch_vcpu[1]); /* Restore run (vcpu->run) */ - UASM_i_LW(&p, A0, offsetof(struct kvm_vcpu, run), A1); - /* Save pointer to run in s0, will be saved by the compiler */ - uasm_i_move(&p, S0, A0); + UASM_i_LW(&p, S0, offsetof(struct kvm_vcpu, run), S1); /* * Save Host level EPC, BadVaddr and Cause to VCPU, useful to process @@ -641,6 +707,52 @@ void *kvm_mips_build_exit(void *addr) uasm_l_msa_1(&l, p); } +#ifdef CONFIG_KVM_MIPS_VZ + /* Restore host ASID */ + if (!cpu_has_guestid) { + UASM_i_LW(&p, K0, offsetof(struct kvm_vcpu_arch, host_entryhi), + K1); + UASM_i_MTC0(&p, K0, C0_ENTRYHI); + } + + /* + * Set up normal Linux process pgd. + * This does roughly the same as TLBMISS_HANDLER_SETUP_PGD(): + * - call tlbmiss_handler_setup_pgd(mm->pgd) + * - write mm->pgd into CP0_PWBase + */ + UASM_i_LW(&p, A0, + offsetof(struct kvm_vcpu_arch, host_pgd), K1); + UASM_i_LA(&p, T9, (unsigned long)tlbmiss_handler_setup_pgd); + uasm_i_jalr(&p, RA, T9); + /* delay slot */ + if (cpu_has_htw) + UASM_i_MTC0(&p, A0, C0_PWBASE); + else + uasm_i_nop(&p); + + /* Clear GM bit so we don't enter guest mode when EXL is cleared */ + uasm_i_mfc0(&p, K0, C0_GUESTCTL0); + uasm_i_ins(&p, K0, ZERO, MIPS_GCTL0_GM_SHIFT, 1); + uasm_i_mtc0(&p, K0, C0_GUESTCTL0); + + /* Save GuestCtl0 so we can access GExcCode after CPU migration */ + uasm_i_sw(&p, K0, + offsetof(struct kvm_vcpu_arch, host_cp0_guestctl0), K1); + + if (cpu_has_guestid) { + /* + * Clear root mode GuestID, so that root TLB operations use the + * root GuestID in the root TLB. + */ + uasm_i_mfc0(&p, T0, C0_GUESTCTL1); + /* Set GuestCtl1.RID = MIPS_GCTL1_ROOT_GUESTID (i.e. 0) */ + uasm_i_ins(&p, T0, ZERO, MIPS_GCTL1_RID_SHIFT, + MIPS_GCTL1_RID_WIDTH); + uasm_i_mtc0(&p, T0, C0_GUESTCTL1); + } +#endif + /* Now that the new EBASE has been loaded, unset BEV and KSU_USER */ uasm_i_addiu(&p, AT, ZERO, ~(ST0_EXL | KSU_USER | ST0_IE)); uasm_i_and(&p, V0, V0, AT); @@ -680,6 +792,8 @@ void *kvm_mips_build_exit(void *addr) * Now jump to the kvm_mips_handle_exit() to see if we can deal * 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); diff --git a/arch/mips/kvm/mips.c b/arch/mips/kvm/mips.c index ab689df283b3..1fa088854cb6 100644 --- a/arch/mips/kvm/mips.c +++ b/arch/mips/kvm/mips.c @@ -324,8 +324,10 @@ struct kvm_vcpu *kvm_arch_vcpu_create(struct kvm *kvm, unsigned int id) /* Build guest exception vectors dynamically in unmapped memory */ handler = gebase + 0x2000; - /* TLB refill */ + /* TLB refill (or XTLB refill on 64-bit VZ where KX=1) */ refill_start = gebase; + if (IS_ENABLED(CONFIG_KVM_MIPS_VZ) && IS_ENABLED(CONFIG_64BIT)) + refill_start += 0x080; refill_end = kvm_mips_build_tlb_refill_exception(refill_start, handler); /* General Exception Entry point */ |