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authorPaul Mackerras <paulus@samba.org>2011-06-28 20:22:05 -0400
committerAvi Kivity <avi@redhat.com>2011-07-12 06:16:55 -0400
commita8606e20e41a8149456bafdf76ad29d47672027c (patch)
treeb50699b3e41fa234b32b01cf5b79ba7bc2ff1f14 /arch/powerpc
parentde56a948b9182fbcf92cb8212f114de096c2d574 (diff)
KVM: PPC: Handle some PAPR hcalls in the kernel
This adds the infrastructure for handling PAPR hcalls in the kernel, either early in the guest exit path while we are still in real mode, or later once the MMU has been turned back on and we are in the full kernel context. The advantage of handling hcalls in real mode if possible is that we avoid two partition switches -- and this will become more important when we support SMT4 guests, since a partition switch means we have to pull all of the threads in the core out of the guest. The disadvantage is that we can only access the kernel linear mapping, not anything vmalloced or ioremapped, since the MMU is off. This also adds code to handle the following hcalls in real mode: H_ENTER Add an HPTE to the hashed page table H_REMOVE Remove an HPTE from the hashed page table H_READ Read HPTEs from the hashed page table H_PROTECT Change the protection bits in an HPTE H_BULK_REMOVE Remove up to 4 HPTEs from the hashed page table H_SET_DABR Set the data address breakpoint register Plus code to handle the following hcalls in the kernel: H_CEDE Idle the vcpu until an interrupt or H_PROD hcall arrives H_PROD Wake up a ceded vcpu H_REGISTER_VPA Register a virtual processor area (VPA) The code that runs in real mode has to be in the base kernel, not in the module, if KVM is compiled as a module. The real-mode code can only access the kernel linear mapping, not vmalloc or ioremap space. Signed-off-by: Paul Mackerras <paulus@samba.org> Signed-off-by: Alexander Graf <agraf@suse.de>
Diffstat (limited to 'arch/powerpc')
-rw-r--r--arch/powerpc/include/asm/hvcall.h5
-rw-r--r--arch/powerpc/include/asm/kvm_host.h11
-rw-r--r--arch/powerpc/include/asm/kvm_ppc.h1
-rw-r--r--arch/powerpc/kernel/asm-offsets.c2
-rw-r--r--arch/powerpc/kvm/Makefile8
-rw-r--r--arch/powerpc/kvm/book3s_hv.c170
-rw-r--r--arch/powerpc/kvm/book3s_hv_rm_mmu.c368
-rw-r--r--arch/powerpc/kvm/book3s_hv_rmhandlers.S158
-rw-r--r--arch/powerpc/kvm/powerpc.c2
9 files changed, 718 insertions, 7 deletions
diff --git a/arch/powerpc/include/asm/hvcall.h b/arch/powerpc/include/asm/hvcall.h
index fd8201dddd4b..1c324ff55ea8 100644
--- a/arch/powerpc/include/asm/hvcall.h
+++ b/arch/powerpc/include/asm/hvcall.h
@@ -29,6 +29,10 @@
29#define H_LONG_BUSY_ORDER_100_SEC 9905 /* Long busy, hint that 100sec \ 29#define H_LONG_BUSY_ORDER_100_SEC 9905 /* Long busy, hint that 100sec \
30 is a good time to retry */ 30 is a good time to retry */
31#define H_LONG_BUSY_END_RANGE 9905 /* End of long busy range */ 31#define H_LONG_BUSY_END_RANGE 9905 /* End of long busy range */
32
33/* Internal value used in book3s_hv kvm support; not returned to guests */
34#define H_TOO_HARD 9999
35
32#define H_HARDWARE -1 /* Hardware error */ 36#define H_HARDWARE -1 /* Hardware error */
33#define H_FUNCTION -2 /* Function not supported */ 37#define H_FUNCTION -2 /* Function not supported */
34#define H_PRIVILEGE -3 /* Caller not privileged */ 38#define H_PRIVILEGE -3 /* Caller not privileged */
@@ -100,6 +104,7 @@
100#define H_PAGE_SET_ACTIVE H_PAGE_STATE_CHANGE 104#define H_PAGE_SET_ACTIVE H_PAGE_STATE_CHANGE
101#define H_AVPN (1UL<<(63-32)) /* An avpn is provided as a sanity test */ 105#define H_AVPN (1UL<<(63-32)) /* An avpn is provided as a sanity test */
102#define H_ANDCOND (1UL<<(63-33)) 106#define H_ANDCOND (1UL<<(63-33))
107#define H_LOCAL (1UL<<(63-35))
103#define H_ICACHE_INVALIDATE (1UL<<(63-40)) /* icbi, etc. (ignored for IO pages) */ 108#define H_ICACHE_INVALIDATE (1UL<<(63-40)) /* icbi, etc. (ignored for IO pages) */
104#define H_ICACHE_SYNCHRONIZE (1UL<<(63-41)) /* dcbst, icbi, etc (ignored for IO pages */ 109#define H_ICACHE_SYNCHRONIZE (1UL<<(63-41)) /* dcbst, icbi, etc (ignored for IO pages */
105#define H_COALESCE_CAND (1UL<<(63-42)) /* page is a good candidate for coalescing */ 110#define H_COALESCE_CAND (1UL<<(63-42)) /* page is a good candidate for coalescing */
diff --git a/arch/powerpc/include/asm/kvm_host.h b/arch/powerpc/include/asm/kvm_host.h
index 4a3f790d5fc4..6ebf1721680a 100644
--- a/arch/powerpc/include/asm/kvm_host.h
+++ b/arch/powerpc/include/asm/kvm_host.h
@@ -59,6 +59,10 @@ struct kvm;
59struct kvm_run; 59struct kvm_run;
60struct kvm_vcpu; 60struct kvm_vcpu;
61 61
62struct lppaca;
63struct slb_shadow;
64struct dtl;
65
62struct kvm_vm_stat { 66struct kvm_vm_stat {
63 u32 remote_tlb_flush; 67 u32 remote_tlb_flush;
64}; 68};
@@ -344,7 +348,14 @@ struct kvm_vcpu_arch {
344 u64 dec_expires; 348 u64 dec_expires;
345 unsigned long pending_exceptions; 349 unsigned long pending_exceptions;
346 u16 last_cpu; 350 u16 last_cpu;
351 u8 ceded;
352 u8 prodded;
347 u32 last_inst; 353 u32 last_inst;
354
355 struct lppaca *vpa;
356 struct slb_shadow *slb_shadow;
357 struct dtl *dtl;
358 struct dtl *dtl_end;
348 int trap; 359 int trap;
349 struct kvm_vcpu_arch_shared *shared; 360 struct kvm_vcpu_arch_shared *shared;
350 unsigned long magic_page_pa; /* phys addr to map the magic page to */ 361 unsigned long magic_page_pa; /* phys addr to map the magic page to */
diff --git a/arch/powerpc/include/asm/kvm_ppc.h b/arch/powerpc/include/asm/kvm_ppc.h
index 0dafd53c30ed..2afe92e6f625 100644
--- a/arch/powerpc/include/asm/kvm_ppc.h
+++ b/arch/powerpc/include/asm/kvm_ppc.h
@@ -118,6 +118,7 @@ extern long kvmppc_prepare_vrma(struct kvm *kvm,
118 struct kvm_userspace_memory_region *mem); 118 struct kvm_userspace_memory_region *mem);
119extern void kvmppc_map_vrma(struct kvm *kvm, 119extern void kvmppc_map_vrma(struct kvm *kvm,
120 struct kvm_userspace_memory_region *mem); 120 struct kvm_userspace_memory_region *mem);
121extern int kvmppc_pseries_do_hcall(struct kvm_vcpu *vcpu);
121extern int kvmppc_core_init_vm(struct kvm *kvm); 122extern int kvmppc_core_init_vm(struct kvm *kvm);
122extern void kvmppc_core_destroy_vm(struct kvm *kvm); 123extern void kvmppc_core_destroy_vm(struct kvm *kvm);
123extern int kvmppc_core_prepare_memory_region(struct kvm *kvm, 124extern int kvmppc_core_prepare_memory_region(struct kvm *kvm,
diff --git a/arch/powerpc/kernel/asm-offsets.c b/arch/powerpc/kernel/asm-offsets.c
index 936267462cae..c70d106bf1a4 100644
--- a/arch/powerpc/kernel/asm-offsets.c
+++ b/arch/powerpc/kernel/asm-offsets.c
@@ -189,6 +189,7 @@ int main(void)
189 DEFINE(LPPACADECRINT, offsetof(struct lppaca, int_dword.fields.decr_int)); 189 DEFINE(LPPACADECRINT, offsetof(struct lppaca, int_dword.fields.decr_int));
190 DEFINE(LPPACA_PMCINUSE, offsetof(struct lppaca, pmcregs_in_use)); 190 DEFINE(LPPACA_PMCINUSE, offsetof(struct lppaca, pmcregs_in_use));
191 DEFINE(LPPACA_DTLIDX, offsetof(struct lppaca, dtl_idx)); 191 DEFINE(LPPACA_DTLIDX, offsetof(struct lppaca, dtl_idx));
192 DEFINE(LPPACA_YIELDCOUNT, offsetof(struct lppaca, yield_count));
192 DEFINE(PACA_DTL_RIDX, offsetof(struct paca_struct, dtl_ridx)); 193 DEFINE(PACA_DTL_RIDX, offsetof(struct paca_struct, dtl_ridx));
193#endif /* CONFIG_PPC_STD_MMU_64 */ 194#endif /* CONFIG_PPC_STD_MMU_64 */
194 DEFINE(PACAEMERGSP, offsetof(struct paca_struct, emergency_sp)); 195 DEFINE(PACAEMERGSP, offsetof(struct paca_struct, emergency_sp));
@@ -459,6 +460,7 @@ int main(void)
459 DEFINE(VCPU_DEC, offsetof(struct kvm_vcpu, arch.dec)); 460 DEFINE(VCPU_DEC, offsetof(struct kvm_vcpu, arch.dec));
460 DEFINE(VCPU_DEC_EXPIRES, offsetof(struct kvm_vcpu, arch.dec_expires)); 461 DEFINE(VCPU_DEC_EXPIRES, offsetof(struct kvm_vcpu, arch.dec_expires));
461 DEFINE(VCPU_LPCR, offsetof(struct kvm_vcpu, arch.lpcr)); 462 DEFINE(VCPU_LPCR, offsetof(struct kvm_vcpu, arch.lpcr));
463 DEFINE(VCPU_VPA, offsetof(struct kvm_vcpu, arch.vpa));
462 DEFINE(VCPU_MMCR, offsetof(struct kvm_vcpu, arch.mmcr)); 464 DEFINE(VCPU_MMCR, offsetof(struct kvm_vcpu, arch.mmcr));
463 DEFINE(VCPU_PMC, offsetof(struct kvm_vcpu, arch.pmc)); 465 DEFINE(VCPU_PMC, offsetof(struct kvm_vcpu, arch.pmc));
464 DEFINE(VCPU_SLB, offsetof(struct kvm_vcpu, arch.slb)); 466 DEFINE(VCPU_SLB, offsetof(struct kvm_vcpu, arch.slb));
diff --git a/arch/powerpc/kvm/Makefile b/arch/powerpc/kvm/Makefile
index 8a435a6da665..2ecffc0dc1bb 100644
--- a/arch/powerpc/kvm/Makefile
+++ b/arch/powerpc/kvm/Makefile
@@ -54,14 +54,17 @@ kvm-book3s_64-objs-$(CONFIG_KVM_BOOK3S_64_HV) := \
54 book3s_hv.o \ 54 book3s_hv.o \
55 book3s_hv_interrupts.o \ 55 book3s_hv_interrupts.o \
56 book3s_64_mmu_hv.o 56 book3s_64_mmu_hv.o
57kvm-book3s_64-builtin-objs-$(CONFIG_KVM_BOOK3S_64_HV) := \
58 book3s_hv_rm_mmu.o
57 59
58kvm-book3s_64-objs := \ 60kvm-book3s_64-module-objs := \
59 ../../../virt/kvm/kvm_main.o \ 61 ../../../virt/kvm/kvm_main.o \
60 powerpc.o \ 62 powerpc.o \
61 emulate.o \ 63 emulate.o \
62 book3s.o \ 64 book3s.o \
63 $(kvm-book3s_64-objs-y) 65 $(kvm-book3s_64-objs-y)
64kvm-objs-$(CONFIG_KVM_BOOK3S_64) := $(kvm-book3s_64-objs) 66
67kvm-objs-$(CONFIG_KVM_BOOK3S_64) := $(kvm-book3s_64-module-objs)
65 68
66kvm-book3s_32-objs := \ 69kvm-book3s_32-objs := \
67 $(common-objs-y) \ 70 $(common-objs-y) \
@@ -83,3 +86,4 @@ obj-$(CONFIG_KVM_E500) += kvm.o
83obj-$(CONFIG_KVM_BOOK3S_64) += kvm.o 86obj-$(CONFIG_KVM_BOOK3S_64) += kvm.o
84obj-$(CONFIG_KVM_BOOK3S_32) += kvm.o 87obj-$(CONFIG_KVM_BOOK3S_32) += kvm.o
85 88
89obj-y += $(kvm-book3s_64-builtin-objs-y)
diff --git a/arch/powerpc/kvm/book3s_hv.c b/arch/powerpc/kvm/book3s_hv.c
index 60b7300568c8..af862c30b70e 100644
--- a/arch/powerpc/kvm/book3s_hv.c
+++ b/arch/powerpc/kvm/book3s_hv.c
@@ -124,6 +124,158 @@ void kvmppc_dump_regs(struct kvm_vcpu *vcpu)
124 vcpu->arch.last_inst); 124 vcpu->arch.last_inst);
125} 125}
126 126
127struct kvm_vcpu *kvmppc_find_vcpu(struct kvm *kvm, int id)
128{
129 int r;
130 struct kvm_vcpu *v, *ret = NULL;
131
132 mutex_lock(&kvm->lock);
133 kvm_for_each_vcpu(r, v, kvm) {
134 if (v->vcpu_id == id) {
135 ret = v;
136 break;
137 }
138 }
139 mutex_unlock(&kvm->lock);
140 return ret;
141}
142
143static void init_vpa(struct kvm_vcpu *vcpu, struct lppaca *vpa)
144{
145 vpa->shared_proc = 1;
146 vpa->yield_count = 1;
147}
148
149static unsigned long do_h_register_vpa(struct kvm_vcpu *vcpu,
150 unsigned long flags,
151 unsigned long vcpuid, unsigned long vpa)
152{
153 struct kvm *kvm = vcpu->kvm;
154 unsigned long pg_index, ra, len;
155 unsigned long pg_offset;
156 void *va;
157 struct kvm_vcpu *tvcpu;
158
159 tvcpu = kvmppc_find_vcpu(kvm, vcpuid);
160 if (!tvcpu)
161 return H_PARAMETER;
162
163 flags >>= 63 - 18;
164 flags &= 7;
165 if (flags == 0 || flags == 4)
166 return H_PARAMETER;
167 if (flags < 4) {
168 if (vpa & 0x7f)
169 return H_PARAMETER;
170 /* registering new area; convert logical addr to real */
171 pg_index = vpa >> kvm->arch.ram_porder;
172 pg_offset = vpa & (kvm->arch.ram_psize - 1);
173 if (pg_index >= kvm->arch.ram_npages)
174 return H_PARAMETER;
175 if (kvm->arch.ram_pginfo[pg_index].pfn == 0)
176 return H_PARAMETER;
177 ra = kvm->arch.ram_pginfo[pg_index].pfn << PAGE_SHIFT;
178 ra |= pg_offset;
179 va = __va(ra);
180 if (flags <= 1)
181 len = *(unsigned short *)(va + 4);
182 else
183 len = *(unsigned int *)(va + 4);
184 if (pg_offset + len > kvm->arch.ram_psize)
185 return H_PARAMETER;
186 switch (flags) {
187 case 1: /* register VPA */
188 if (len < 640)
189 return H_PARAMETER;
190 tvcpu->arch.vpa = va;
191 init_vpa(vcpu, va);
192 break;
193 case 2: /* register DTL */
194 if (len < 48)
195 return H_PARAMETER;
196 if (!tvcpu->arch.vpa)
197 return H_RESOURCE;
198 len -= len % 48;
199 tvcpu->arch.dtl = va;
200 tvcpu->arch.dtl_end = va + len;
201 break;
202 case 3: /* register SLB shadow buffer */
203 if (len < 8)
204 return H_PARAMETER;
205 if (!tvcpu->arch.vpa)
206 return H_RESOURCE;
207 tvcpu->arch.slb_shadow = va;
208 len = (len - 16) / 16;
209 tvcpu->arch.slb_shadow = va;
210 break;
211 }
212 } else {
213 switch (flags) {
214 case 5: /* unregister VPA */
215 if (tvcpu->arch.slb_shadow || tvcpu->arch.dtl)
216 return H_RESOURCE;
217 tvcpu->arch.vpa = NULL;
218 break;
219 case 6: /* unregister DTL */
220 tvcpu->arch.dtl = NULL;
221 break;
222 case 7: /* unregister SLB shadow buffer */
223 tvcpu->arch.slb_shadow = NULL;
224 break;
225 }
226 }
227 return H_SUCCESS;
228}
229
230int kvmppc_pseries_do_hcall(struct kvm_vcpu *vcpu)
231{
232 unsigned long req = kvmppc_get_gpr(vcpu, 3);
233 unsigned long target, ret = H_SUCCESS;
234 struct kvm_vcpu *tvcpu;
235
236 switch (req) {
237 case H_CEDE:
238 vcpu->arch.shregs.msr |= MSR_EE;
239 vcpu->arch.ceded = 1;
240 smp_mb();
241 if (!vcpu->arch.prodded)
242 kvmppc_vcpu_block(vcpu);
243 else
244 vcpu->arch.prodded = 0;
245 smp_mb();
246 vcpu->arch.ceded = 0;
247 break;
248 case H_PROD:
249 target = kvmppc_get_gpr(vcpu, 4);
250 tvcpu = kvmppc_find_vcpu(vcpu->kvm, target);
251 if (!tvcpu) {
252 ret = H_PARAMETER;
253 break;
254 }
255 tvcpu->arch.prodded = 1;
256 smp_mb();
257 if (vcpu->arch.ceded) {
258 if (waitqueue_active(&vcpu->wq)) {
259 wake_up_interruptible(&vcpu->wq);
260 vcpu->stat.halt_wakeup++;
261 }
262 }
263 break;
264 case H_CONFER:
265 break;
266 case H_REGISTER_VPA:
267 ret = do_h_register_vpa(vcpu, kvmppc_get_gpr(vcpu, 4),
268 kvmppc_get_gpr(vcpu, 5),
269 kvmppc_get_gpr(vcpu, 6));
270 break;
271 default:
272 return RESUME_HOST;
273 }
274 kvmppc_set_gpr(vcpu, 3, ret);
275 vcpu->arch.hcall_needed = 0;
276 return RESUME_GUEST;
277}
278
127static int kvmppc_handle_exit(struct kvm_run *run, struct kvm_vcpu *vcpu, 279static int kvmppc_handle_exit(struct kvm_run *run, struct kvm_vcpu *vcpu,
128 struct task_struct *tsk) 280 struct task_struct *tsk)
129{ 281{
@@ -318,7 +470,7 @@ void kvmppc_core_vcpu_free(struct kvm_vcpu *vcpu)
318 470
319extern int __kvmppc_vcore_entry(struct kvm_run *kvm_run, struct kvm_vcpu *vcpu); 471extern int __kvmppc_vcore_entry(struct kvm_run *kvm_run, struct kvm_vcpu *vcpu);
320 472
321int kvmppc_vcpu_run(struct kvm_run *run, struct kvm_vcpu *vcpu) 473static int kvmppc_run_vcpu(struct kvm_run *run, struct kvm_vcpu *vcpu)
322{ 474{
323 u64 now; 475 u64 now;
324 476
@@ -370,6 +522,22 @@ int kvmppc_vcpu_run(struct kvm_run *run, struct kvm_vcpu *vcpu)
370 return -EBUSY; 522 return -EBUSY;
371} 523}
372 524
525int kvmppc_vcpu_run(struct kvm_run *run, struct kvm_vcpu *vcpu)
526{
527 int r;
528
529 do {
530 r = kvmppc_run_vcpu(run, vcpu);
531
532 if (run->exit_reason == KVM_EXIT_PAPR_HCALL &&
533 !(vcpu->arch.shregs.msr & MSR_PR)) {
534 r = kvmppc_pseries_do_hcall(vcpu);
535 kvmppc_core_deliver_interrupts(vcpu);
536 }
537 } while (r == RESUME_GUEST);
538 return r;
539}
540
373int kvmppc_core_prepare_memory_region(struct kvm *kvm, 541int kvmppc_core_prepare_memory_region(struct kvm *kvm,
374 struct kvm_userspace_memory_region *mem) 542 struct kvm_userspace_memory_region *mem)
375{ 543{
diff --git a/arch/powerpc/kvm/book3s_hv_rm_mmu.c b/arch/powerpc/kvm/book3s_hv_rm_mmu.c
new file mode 100644
index 000000000000..edb0aae901a3
--- /dev/null
+++ b/arch/powerpc/kvm/book3s_hv_rm_mmu.c
@@ -0,0 +1,368 @@
1/*
2 * This program is free software; you can redistribute it and/or modify
3 * it under the terms of the GNU General Public License, version 2, as
4 * published by the Free Software Foundation.
5 *
6 * Copyright 2010-2011 Paul Mackerras, IBM Corp. <paulus@au1.ibm.com>
7 */
8
9#include <linux/types.h>
10#include <linux/string.h>
11#include <linux/kvm.h>
12#include <linux/kvm_host.h>
13#include <linux/hugetlb.h>
14
15#include <asm/tlbflush.h>
16#include <asm/kvm_ppc.h>
17#include <asm/kvm_book3s.h>
18#include <asm/mmu-hash64.h>
19#include <asm/hvcall.h>
20#include <asm/synch.h>
21#include <asm/ppc-opcode.h>
22
23/* For now use fixed-size 16MB page table */
24#define HPT_ORDER 24
25#define HPT_NPTEG (1ul << (HPT_ORDER - 7)) /* 128B per pteg */
26#define HPT_HASH_MASK (HPT_NPTEG - 1)
27
28#define HPTE_V_HVLOCK 0x40UL
29
30static inline long lock_hpte(unsigned long *hpte, unsigned long bits)
31{
32 unsigned long tmp, old;
33
34 asm volatile(" ldarx %0,0,%2\n"
35 " and. %1,%0,%3\n"
36 " bne 2f\n"
37 " ori %0,%0,%4\n"
38 " stdcx. %0,0,%2\n"
39 " beq+ 2f\n"
40 " li %1,%3\n"
41 "2: isync"
42 : "=&r" (tmp), "=&r" (old)
43 : "r" (hpte), "r" (bits), "i" (HPTE_V_HVLOCK)
44 : "cc", "memory");
45 return old == 0;
46}
47
48long kvmppc_h_enter(struct kvm_vcpu *vcpu, unsigned long flags,
49 long pte_index, unsigned long pteh, unsigned long ptel)
50{
51 unsigned long porder;
52 struct kvm *kvm = vcpu->kvm;
53 unsigned long i, lpn, pa;
54 unsigned long *hpte;
55
56 /* only handle 4k, 64k and 16M pages for now */
57 porder = 12;
58 if (pteh & HPTE_V_LARGE) {
59 if ((ptel & 0xf000) == 0x1000) {
60 /* 64k page */
61 porder = 16;
62 } else if ((ptel & 0xff000) == 0) {
63 /* 16M page */
64 porder = 24;
65 /* lowest AVA bit must be 0 for 16M pages */
66 if (pteh & 0x80)
67 return H_PARAMETER;
68 } else
69 return H_PARAMETER;
70 }
71 lpn = (ptel & HPTE_R_RPN) >> kvm->arch.ram_porder;
72 if (lpn >= kvm->arch.ram_npages || porder > kvm->arch.ram_porder)
73 return H_PARAMETER;
74 pa = kvm->arch.ram_pginfo[lpn].pfn << PAGE_SHIFT;
75 if (!pa)
76 return H_PARAMETER;
77 /* Check WIMG */
78 if ((ptel & HPTE_R_WIMG) != HPTE_R_M &&
79 (ptel & HPTE_R_WIMG) != (HPTE_R_W | HPTE_R_I | HPTE_R_M))
80 return H_PARAMETER;
81 pteh &= ~0x60UL;
82 ptel &= ~(HPTE_R_PP0 - kvm->arch.ram_psize);
83 ptel |= pa;
84 if (pte_index >= (HPT_NPTEG << 3))
85 return H_PARAMETER;
86 if (likely((flags & H_EXACT) == 0)) {
87 pte_index &= ~7UL;
88 hpte = (unsigned long *)(kvm->arch.hpt_virt + (pte_index << 4));
89 for (i = 0; ; ++i) {
90 if (i == 8)
91 return H_PTEG_FULL;
92 if ((*hpte & HPTE_V_VALID) == 0 &&
93 lock_hpte(hpte, HPTE_V_HVLOCK | HPTE_V_VALID))
94 break;
95 hpte += 2;
96 }
97 } else {
98 i = 0;
99 hpte = (unsigned long *)(kvm->arch.hpt_virt + (pte_index << 4));
100 if (!lock_hpte(hpte, HPTE_V_HVLOCK | HPTE_V_VALID))
101 return H_PTEG_FULL;
102 }
103 hpte[1] = ptel;
104 eieio();
105 hpte[0] = pteh;
106 asm volatile("ptesync" : : : "memory");
107 atomic_inc(&kvm->arch.ram_pginfo[lpn].refcnt);
108 vcpu->arch.gpr[4] = pte_index + i;
109 return H_SUCCESS;
110}
111
112static unsigned long compute_tlbie_rb(unsigned long v, unsigned long r,
113 unsigned long pte_index)
114{
115 unsigned long rb, va_low;
116
117 rb = (v & ~0x7fUL) << 16; /* AVA field */
118 va_low = pte_index >> 3;
119 if (v & HPTE_V_SECONDARY)
120 va_low = ~va_low;
121 /* xor vsid from AVA */
122 if (!(v & HPTE_V_1TB_SEG))
123 va_low ^= v >> 12;
124 else
125 va_low ^= v >> 24;
126 va_low &= 0x7ff;
127 if (v & HPTE_V_LARGE) {
128 rb |= 1; /* L field */
129 if (r & 0xff000) {
130 /* non-16MB large page, must be 64k */
131 /* (masks depend on page size) */
132 rb |= 0x1000; /* page encoding in LP field */
133 rb |= (va_low & 0x7f) << 16; /* 7b of VA in AVA/LP field */
134 rb |= (va_low & 0xfe); /* AVAL field (P7 doesn't seem to care) */
135 }
136 } else {
137 /* 4kB page */
138 rb |= (va_low & 0x7ff) << 12; /* remaining 11b of VA */
139 }
140 rb |= (v >> 54) & 0x300; /* B field */
141 return rb;
142}
143
144#define LOCK_TOKEN (*(u32 *)(&get_paca()->lock_token))
145
146static inline int try_lock_tlbie(unsigned int *lock)
147{
148 unsigned int tmp, old;
149 unsigned int token = LOCK_TOKEN;
150
151 asm volatile("1:lwarx %1,0,%2\n"
152 " cmpwi cr0,%1,0\n"
153 " bne 2f\n"
154 " stwcx. %3,0,%2\n"
155 " bne- 1b\n"
156 " isync\n"
157 "2:"
158 : "=&r" (tmp), "=&r" (old)
159 : "r" (lock), "r" (token)
160 : "cc", "memory");
161 return old == 0;
162}
163
164long kvmppc_h_remove(struct kvm_vcpu *vcpu, unsigned long flags,
165 unsigned long pte_index, unsigned long avpn,
166 unsigned long va)
167{
168 struct kvm *kvm = vcpu->kvm;
169 unsigned long *hpte;
170 unsigned long v, r, rb;
171
172 if (pte_index >= (HPT_NPTEG << 3))
173 return H_PARAMETER;
174 hpte = (unsigned long *)(kvm->arch.hpt_virt + (pte_index << 4));
175 while (!lock_hpte(hpte, HPTE_V_HVLOCK))
176 cpu_relax();
177 if ((hpte[0] & HPTE_V_VALID) == 0 ||
178 ((flags & H_AVPN) && (hpte[0] & ~0x7fUL) != avpn) ||
179 ((flags & H_ANDCOND) && (hpte[0] & avpn) != 0)) {
180 hpte[0] &= ~HPTE_V_HVLOCK;
181 return H_NOT_FOUND;
182 }
183 if (atomic_read(&kvm->online_vcpus) == 1)
184 flags |= H_LOCAL;
185 vcpu->arch.gpr[4] = v = hpte[0] & ~HPTE_V_HVLOCK;
186 vcpu->arch.gpr[5] = r = hpte[1];
187 rb = compute_tlbie_rb(v, r, pte_index);
188 hpte[0] = 0;
189 if (!(flags & H_LOCAL)) {
190 while(!try_lock_tlbie(&kvm->arch.tlbie_lock))
191 cpu_relax();
192 asm volatile("ptesync" : : : "memory");
193 asm volatile(PPC_TLBIE(%1,%0)"; eieio; tlbsync"
194 : : "r" (rb), "r" (kvm->arch.lpid));
195 asm volatile("ptesync" : : : "memory");
196 kvm->arch.tlbie_lock = 0;
197 } else {
198 asm volatile("ptesync" : : : "memory");
199 asm volatile("tlbiel %0" : : "r" (rb));
200 asm volatile("ptesync" : : : "memory");
201 }
202 return H_SUCCESS;
203}
204
205long kvmppc_h_bulk_remove(struct kvm_vcpu *vcpu)
206{
207 struct kvm *kvm = vcpu->kvm;
208 unsigned long *args = &vcpu->arch.gpr[4];
209 unsigned long *hp, tlbrb[4];
210 long int i, found;
211 long int n_inval = 0;
212 unsigned long flags, req, pte_index;
213 long int local = 0;
214 long int ret = H_SUCCESS;
215
216 if (atomic_read(&kvm->online_vcpus) == 1)
217 local = 1;
218 for (i = 0; i < 4; ++i) {
219 pte_index = args[i * 2];
220 flags = pte_index >> 56;
221 pte_index &= ((1ul << 56) - 1);
222 req = flags >> 6;
223 flags &= 3;
224 if (req == 3)
225 break;
226 if (req != 1 || flags == 3 ||
227 pte_index >= (HPT_NPTEG << 3)) {
228 /* parameter error */
229 args[i * 2] = ((0xa0 | flags) << 56) + pte_index;
230 ret = H_PARAMETER;
231 break;
232 }
233 hp = (unsigned long *)(kvm->arch.hpt_virt + (pte_index << 4));
234 while (!lock_hpte(hp, HPTE_V_HVLOCK))
235 cpu_relax();
236 found = 0;
237 if (hp[0] & HPTE_V_VALID) {
238 switch (flags & 3) {
239 case 0: /* absolute */
240 found = 1;
241 break;
242 case 1: /* andcond */
243 if (!(hp[0] & args[i * 2 + 1]))
244 found = 1;
245 break;
246 case 2: /* AVPN */
247 if ((hp[0] & ~0x7fUL) == args[i * 2 + 1])
248 found = 1;
249 break;
250 }
251 }
252 if (!found) {
253 hp[0] &= ~HPTE_V_HVLOCK;
254 args[i * 2] = ((0x90 | flags) << 56) + pte_index;
255 continue;
256 }
257 /* insert R and C bits from PTE */
258 flags |= (hp[1] >> 5) & 0x0c;
259 args[i * 2] = ((0x80 | flags) << 56) + pte_index;
260 tlbrb[n_inval++] = compute_tlbie_rb(hp[0], hp[1], pte_index);
261 hp[0] = 0;
262 }
263 if (n_inval == 0)
264 return ret;
265
266 if (!local) {
267 while(!try_lock_tlbie(&kvm->arch.tlbie_lock))
268 cpu_relax();
269 asm volatile("ptesync" : : : "memory");
270 for (i = 0; i < n_inval; ++i)
271 asm volatile(PPC_TLBIE(%1,%0)
272 : : "r" (tlbrb[i]), "r" (kvm->arch.lpid));
273 asm volatile("eieio; tlbsync; ptesync" : : : "memory");
274 kvm->arch.tlbie_lock = 0;
275 } else {
276 asm volatile("ptesync" : : : "memory");
277 for (i = 0; i < n_inval; ++i)
278 asm volatile("tlbiel %0" : : "r" (tlbrb[i]));
279 asm volatile("ptesync" : : : "memory");
280 }
281 return ret;
282}
283
284long kvmppc_h_protect(struct kvm_vcpu *vcpu, unsigned long flags,
285 unsigned long pte_index, unsigned long avpn,
286 unsigned long va)
287{
288 struct kvm *kvm = vcpu->kvm;
289 unsigned long *hpte;
290 unsigned long v, r, rb;
291
292 if (pte_index >= (HPT_NPTEG << 3))
293 return H_PARAMETER;
294 hpte = (unsigned long *)(kvm->arch.hpt_virt + (pte_index << 4));
295 while (!lock_hpte(hpte, HPTE_V_HVLOCK))
296 cpu_relax();
297 if ((hpte[0] & HPTE_V_VALID) == 0 ||
298 ((flags & H_AVPN) && (hpte[0] & ~0x7fUL) != avpn)) {
299 hpte[0] &= ~HPTE_V_HVLOCK;
300 return H_NOT_FOUND;
301 }
302 if (atomic_read(&kvm->online_vcpus) == 1)
303 flags |= H_LOCAL;
304 v = hpte[0];
305 r = hpte[1] & ~(HPTE_R_PP0 | HPTE_R_PP | HPTE_R_N |
306 HPTE_R_KEY_HI | HPTE_R_KEY_LO);
307 r |= (flags << 55) & HPTE_R_PP0;
308 r |= (flags << 48) & HPTE_R_KEY_HI;
309 r |= flags & (HPTE_R_PP | HPTE_R_N | HPTE_R_KEY_LO);
310 rb = compute_tlbie_rb(v, r, pte_index);
311 hpte[0] = v & ~HPTE_V_VALID;
312 if (!(flags & H_LOCAL)) {
313 while(!try_lock_tlbie(&kvm->arch.tlbie_lock))
314 cpu_relax();
315 asm volatile("ptesync" : : : "memory");
316 asm volatile(PPC_TLBIE(%1,%0)"; eieio; tlbsync"
317 : : "r" (rb), "r" (kvm->arch.lpid));
318 asm volatile("ptesync" : : : "memory");
319 kvm->arch.tlbie_lock = 0;
320 } else {
321 asm volatile("ptesync" : : : "memory");
322 asm volatile("tlbiel %0" : : "r" (rb));
323 asm volatile("ptesync" : : : "memory");
324 }
325 hpte[1] = r;
326 eieio();
327 hpte[0] = v & ~HPTE_V_HVLOCK;
328 asm volatile("ptesync" : : : "memory");
329 return H_SUCCESS;
330}
331
332static unsigned long reverse_xlate(struct kvm *kvm, unsigned long realaddr)
333{
334 long int i;
335 unsigned long offset, rpn;
336
337 offset = realaddr & (kvm->arch.ram_psize - 1);
338 rpn = (realaddr - offset) >> PAGE_SHIFT;
339 for (i = 0; i < kvm->arch.ram_npages; ++i)
340 if (rpn == kvm->arch.ram_pginfo[i].pfn)
341 return (i << PAGE_SHIFT) + offset;
342 return HPTE_R_RPN; /* all 1s in the RPN field */
343}
344
345long kvmppc_h_read(struct kvm_vcpu *vcpu, unsigned long flags,
346 unsigned long pte_index)
347{
348 struct kvm *kvm = vcpu->kvm;
349 unsigned long *hpte, r;
350 int i, n = 1;
351
352 if (pte_index >= (HPT_NPTEG << 3))
353 return H_PARAMETER;
354 if (flags & H_READ_4) {
355 pte_index &= ~3;
356 n = 4;
357 }
358 for (i = 0; i < n; ++i, ++pte_index) {
359 hpte = (unsigned long *)(kvm->arch.hpt_virt + (pte_index << 4));
360 r = hpte[1];
361 if ((flags & H_R_XLATE) && (hpte[0] & HPTE_V_VALID))
362 r = reverse_xlate(kvm, r & HPTE_R_RPN) |
363 (r & ~HPTE_R_RPN);
364 vcpu->arch.gpr[4 + i * 2] = hpte[0];
365 vcpu->arch.gpr[5 + i * 2] = r;
366 }
367 return H_SUCCESS;
368}
diff --git a/arch/powerpc/kvm/book3s_hv_rmhandlers.S b/arch/powerpc/kvm/book3s_hv_rmhandlers.S
index 9af264840b98..319ff63b1f31 100644
--- a/arch/powerpc/kvm/book3s_hv_rmhandlers.S
+++ b/arch/powerpc/kvm/book3s_hv_rmhandlers.S
@@ -166,6 +166,14 @@ kvmppc_hv_entry:
166 /* Save R1 in the PACA */ 166 /* Save R1 in the PACA */
167 std r1, HSTATE_HOST_R1(r13) 167 std r1, HSTATE_HOST_R1(r13)
168 168
169 /* Increment yield count if they have a VPA */
170 ld r3, VCPU_VPA(r4)
171 cmpdi r3, 0
172 beq 25f
173 lwz r5, LPPACA_YIELDCOUNT(r3)
174 addi r5, r5, 1
175 stw r5, LPPACA_YIELDCOUNT(r3)
17625:
169 /* Load up DAR and DSISR */ 177 /* Load up DAR and DSISR */
170 ld r5, VCPU_DAR(r4) 178 ld r5, VCPU_DAR(r4)
171 lwz r6, VCPU_DSISR(r4) 179 lwz r6, VCPU_DSISR(r4)
@@ -401,6 +409,10 @@ kvmppc_interrupt:
401 cmpwi r3,0 409 cmpwi r3,0
402 bge ignore_hdec 410 bge ignore_hdec
4032: 4112:
412 /* See if this is something we can handle in real mode */
413 cmpwi r12,BOOK3S_INTERRUPT_SYSCALL
414 beq hcall_try_real_mode
415hcall_real_cont:
404 416
405 /* Check for mediated interrupts (could be done earlier really ...) */ 417 /* Check for mediated interrupts (could be done earlier really ...) */
406 cmpwi r12,BOOK3S_INTERRUPT_EXTERNAL 418 cmpwi r12,BOOK3S_INTERRUPT_EXTERNAL
@@ -579,13 +591,28 @@ hdec_soon:
579 std r5, VCPU_SPRG2(r9) 591 std r5, VCPU_SPRG2(r9)
580 std r6, VCPU_SPRG3(r9) 592 std r6, VCPU_SPRG3(r9)
581 593
582 /* Save PMU registers */ 594 /* Increment yield count if they have a VPA */
595 ld r8, VCPU_VPA(r9) /* do they have a VPA? */
596 cmpdi r8, 0
597 beq 25f
598 lwz r3, LPPACA_YIELDCOUNT(r8)
599 addi r3, r3, 1
600 stw r3, LPPACA_YIELDCOUNT(r8)
60125:
602 /* Save PMU registers if requested */
603 /* r8 and cr0.eq are live here */
583 li r3, 1 604 li r3, 1
584 sldi r3, r3, 31 /* MMCR0_FC (freeze counters) bit */ 605 sldi r3, r3, 31 /* MMCR0_FC (freeze counters) bit */
585 mfspr r4, SPRN_MMCR0 /* save MMCR0 */ 606 mfspr r4, SPRN_MMCR0 /* save MMCR0 */
586 mtspr SPRN_MMCR0, r3 /* freeze all counters, disable ints */ 607 mtspr SPRN_MMCR0, r3 /* freeze all counters, disable ints */
587 isync 608 isync
588 mfspr r5, SPRN_MMCR1 609 beq 21f /* if no VPA, save PMU stuff anyway */
610 lbz r7, LPPACA_PMCINUSE(r8)
611 cmpwi r7, 0 /* did they ask for PMU stuff to be saved? */
612 bne 21f
613 std r3, VCPU_MMCR(r9) /* if not, set saved MMCR0 to FC */
614 b 22f
61521: mfspr r5, SPRN_MMCR1
589 mfspr r6, SPRN_MMCRA 616 mfspr r6, SPRN_MMCRA
590 std r4, VCPU_MMCR(r9) 617 std r4, VCPU_MMCR(r9)
591 std r5, VCPU_MMCR + 8(r9) 618 std r5, VCPU_MMCR + 8(r9)
@@ -676,6 +703,125 @@ hdec_soon:
676 mfspr r7,SPRN_HDSISR 703 mfspr r7,SPRN_HDSISR
677 b 7b 704 b 7b
678 705
706/*
707 * Try to handle an hcall in real mode.
708 * Returns to the guest if we handle it, or continues on up to
709 * the kernel if we can't (i.e. if we don't have a handler for
710 * it, or if the handler returns H_TOO_HARD).
711 */
712 .globl hcall_try_real_mode
713hcall_try_real_mode:
714 ld r3,VCPU_GPR(r3)(r9)
715 andi. r0,r11,MSR_PR
716 bne hcall_real_cont
717 clrrdi r3,r3,2
718 cmpldi r3,hcall_real_table_end - hcall_real_table
719 bge hcall_real_cont
720 LOAD_REG_ADDR(r4, hcall_real_table)
721 lwzx r3,r3,r4
722 cmpwi r3,0
723 beq hcall_real_cont
724 add r3,r3,r4
725 mtctr r3
726 mr r3,r9 /* get vcpu pointer */
727 ld r4,VCPU_GPR(r4)(r9)
728 bctrl
729 cmpdi r3,H_TOO_HARD
730 beq hcall_real_fallback
731 ld r4,HSTATE_KVM_VCPU(r13)
732 std r3,VCPU_GPR(r3)(r4)
733 ld r10,VCPU_PC(r4)
734 ld r11,VCPU_MSR(r4)
735 b fast_guest_return
736
737 /* We've attempted a real mode hcall, but it's punted it back
738 * to userspace. We need to restore some clobbered volatiles
739 * before resuming the pass-it-to-qemu path */
740hcall_real_fallback:
741 li r12,BOOK3S_INTERRUPT_SYSCALL
742 ld r9, HSTATE_KVM_VCPU(r13)
743 ld r11, VCPU_MSR(r9)
744
745 b hcall_real_cont
746
747 .globl hcall_real_table
748hcall_real_table:
749 .long 0 /* 0 - unused */
750 .long .kvmppc_h_remove - hcall_real_table
751 .long .kvmppc_h_enter - hcall_real_table
752 .long .kvmppc_h_read - hcall_real_table
753 .long 0 /* 0x10 - H_CLEAR_MOD */
754 .long 0 /* 0x14 - H_CLEAR_REF */
755 .long .kvmppc_h_protect - hcall_real_table
756 .long 0 /* 0x1c - H_GET_TCE */
757 .long 0 /* 0x20 - H_SET_TCE */
758 .long 0 /* 0x24 - H_SET_SPRG0 */
759 .long .kvmppc_h_set_dabr - hcall_real_table
760 .long 0 /* 0x2c */
761 .long 0 /* 0x30 */
762 .long 0 /* 0x34 */
763 .long 0 /* 0x38 */
764 .long 0 /* 0x3c */
765 .long 0 /* 0x40 */
766 .long 0 /* 0x44 */
767 .long 0 /* 0x48 */
768 .long 0 /* 0x4c */
769 .long 0 /* 0x50 */
770 .long 0 /* 0x54 */
771 .long 0 /* 0x58 */
772 .long 0 /* 0x5c */
773 .long 0 /* 0x60 */
774 .long 0 /* 0x64 */
775 .long 0 /* 0x68 */
776 .long 0 /* 0x6c */
777 .long 0 /* 0x70 */
778 .long 0 /* 0x74 */
779 .long 0 /* 0x78 */
780 .long 0 /* 0x7c */
781 .long 0 /* 0x80 */
782 .long 0 /* 0x84 */
783 .long 0 /* 0x88 */
784 .long 0 /* 0x8c */
785 .long 0 /* 0x90 */
786 .long 0 /* 0x94 */
787 .long 0 /* 0x98 */
788 .long 0 /* 0x9c */
789 .long 0 /* 0xa0 */
790 .long 0 /* 0xa4 */
791 .long 0 /* 0xa8 */
792 .long 0 /* 0xac */
793 .long 0 /* 0xb0 */
794 .long 0 /* 0xb4 */
795 .long 0 /* 0xb8 */
796 .long 0 /* 0xbc */
797 .long 0 /* 0xc0 */
798 .long 0 /* 0xc4 */
799 .long 0 /* 0xc8 */
800 .long 0 /* 0xcc */
801 .long 0 /* 0xd0 */
802 .long 0 /* 0xd4 */
803 .long 0 /* 0xd8 */
804 .long 0 /* 0xdc */
805 .long 0 /* 0xe0 */
806 .long 0 /* 0xe4 */
807 .long 0 /* 0xe8 */
808 .long 0 /* 0xec */
809 .long 0 /* 0xf0 */
810 .long 0 /* 0xf4 */
811 .long 0 /* 0xf8 */
812 .long 0 /* 0xfc */
813 .long 0 /* 0x100 */
814 .long 0 /* 0x104 */
815 .long 0 /* 0x108 */
816 .long 0 /* 0x10c */
817 .long 0 /* 0x110 */
818 .long 0 /* 0x114 */
819 .long 0 /* 0x118 */
820 .long 0 /* 0x11c */
821 .long 0 /* 0x120 */
822 .long .kvmppc_h_bulk_remove - hcall_real_table
823hcall_real_table_end:
824
679ignore_hdec: 825ignore_hdec:
680 mr r4,r9 826 mr r4,r9
681 b fast_guest_return 827 b fast_guest_return
@@ -688,10 +834,16 @@ bounce_ext_interrupt:
688 LOAD_REG_IMMEDIATE(r11,MSR_SF | MSR_ME); 834 LOAD_REG_IMMEDIATE(r11,MSR_SF | MSR_ME);
689 b fast_guest_return 835 b fast_guest_return
690 836
837_GLOBAL(kvmppc_h_set_dabr)
838 std r4,VCPU_DABR(r3)
839 mtspr SPRN_DABR,r4
840 li r3,0
841 blr
842
691/* 843/*
692 * Save away FP, VMX and VSX registers. 844 * Save away FP, VMX and VSX registers.
693 * r3 = vcpu pointer 845 * r3 = vcpu pointer
694*/ 846 */
695_GLOBAL(kvmppc_save_fp) 847_GLOBAL(kvmppc_save_fp)
696 mfmsr r9 848 mfmsr r9
697 ori r8,r9,MSR_FP 849 ori r8,r9,MSR_FP
diff --git a/arch/powerpc/kvm/powerpc.c b/arch/powerpc/kvm/powerpc.c
index 3a4f379ee70f..6fc9ee499b61 100644
--- a/arch/powerpc/kvm/powerpc.c
+++ b/arch/powerpc/kvm/powerpc.c
@@ -42,7 +42,7 @@ int kvm_arch_vcpu_runnable(struct kvm_vcpu *v)
42 return !(v->arch.shared->msr & MSR_WE) || 42 return !(v->arch.shared->msr & MSR_WE) ||
43 !!(v->arch.pending_exceptions); 43 !!(v->arch.pending_exceptions);
44#else 44#else
45 return 1; 45 return !(v->arch.ceded) || !!(v->arch.pending_exceptions);
46#endif 46#endif
47} 47}
48 48
generated by cgit v1.2.2 (git 2.25.0) at 2024-10-16 14:54:22 -0400