* arch/x86/kvm/lapic.c:255:15: sparse: struct kvm_apic_map __rcu COPYING CREDITS Documentation Kbuild Kconfig LICENSES MAINTAINERS Makefile README arch block certs crypto drivers fs include init ipc kernel lib mm net samples scripts security sound tools usr virt
@ 2020-07-24 2:07 ` kernel test robot
0 siblings, 0 replies; 2+ messages in thread
From: kernel test robot @ 2020-07-24 2:07 UTC (permalink / raw)
To: Luc Van Oostenryck; +Cc: kbuild-all, linux-kernel
[-- Attachment #1: Type: text/plain, Size: 13400 bytes --]
tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head: d15be546031cf65a0fc34879beca02fd90fe7ac7
commit: 670d0a4b10704667765f7d18f7592993d02783aa sparse: use identifiers to define address spaces
date: 5 weeks ago
config: i386-randconfig-s002-20200724 (attached as .config)
compiler: gcc-9 (Debian 9.3.0-14) 9.3.0
reproduce:
# apt-get install sparse
# sparse version: v0.6.2-93-g4c6cbe55-dirty
git checkout 670d0a4b10704667765f7d18f7592993d02783aa
# save the attached .config to linux build tree
make W=1 C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' ARCH=i386
If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@intel.com>
sparse warnings: (new ones prefixed by >>)
arch/x86/kvm/lapic.c:255:15: sparse: sparse: incompatible types in comparison expression (different address spaces):
>> arch/x86/kvm/lapic.c:255:15: sparse: struct kvm_apic_map [noderef] __rcu *
arch/x86/kvm/lapic.c:255:15: sparse: struct kvm_apic_map *
arch/x86/kvm/lapic.c:257:9: sparse: sparse: incompatible types in comparison expression (different address spaces):
arch/x86/kvm/lapic.c:257:9: sparse: struct kvm_apic_map [noderef] __rcu *
arch/x86/kvm/lapic.c:257:9: sparse: struct kvm_apic_map *
arch/x86/kvm/lapic.c:615:15: sparse: sparse: incompatible types in comparison expression (different address spaces):
arch/x86/kvm/lapic.c:615:15: sparse: struct kvm_apic_map [noderef] __rcu *
arch/x86/kvm/lapic.c:615:15: sparse: struct kvm_apic_map *
arch/x86/kvm/lapic.c:972:15: sparse: sparse: incompatible types in comparison expression (different address spaces):
arch/x86/kvm/lapic.c:972:15: sparse: struct kvm_apic_map [noderef] __rcu *
arch/x86/kvm/lapic.c:972:15: sparse: struct kvm_apic_map *
arch/x86/kvm/lapic.c:1014:15: sparse: sparse: incompatible types in comparison expression (different address spaces):
arch/x86/kvm/lapic.c:1014:15: sparse: struct kvm_apic_map [noderef] __rcu *
arch/x86/kvm/lapic.c:1014:15: sparse: struct kvm_apic_map *
arch/x86/kvm/lapic.c:1151:15: sparse: sparse: incompatible types in comparison expression (different address spaces):
arch/x86/kvm/lapic.c:1151:15: sparse: struct kvm_apic_map [noderef] __rcu *
arch/x86/kvm/lapic.c:1151:15: sparse: struct kvm_apic_map *
--
arch/x86/kvm/pmu.c:190:18: sparse: sparse: incompatible types in comparison expression (different address spaces):
>> arch/x86/kvm/pmu.c:190:18: sparse: struct kvm_pmu_event_filter [noderef] __rcu *
arch/x86/kvm/pmu.c:190:18: sparse: struct kvm_pmu_event_filter *
arch/x86/kvm/pmu.c:251:18: sparse: sparse: incompatible types in comparison expression (different address spaces):
arch/x86/kvm/pmu.c:251:18: sparse: struct kvm_pmu_event_filter [noderef] __rcu *
arch/x86/kvm/pmu.c:251:18: sparse: struct kvm_pmu_event_filter *
arch/x86/kvm/pmu.c:511:18: sparse: sparse: incompatible types in comparison expression (different address spaces):
arch/x86/kvm/pmu.c:511:18: sparse: struct kvm_pmu_event_filter [noderef] __rcu *
arch/x86/kvm/pmu.c:511:18: sparse: struct kvm_pmu_event_filter *
arch/x86/kvm/pmu.c:511:18: sparse: sparse: incompatible types in comparison expression (different address spaces):
arch/x86/kvm/pmu.c:511:18: sparse: struct kvm_pmu_event_filter [noderef] __rcu *
arch/x86/kvm/pmu.c:511:18: sparse: struct kvm_pmu_event_filter *
--
>> arch/x86/kvm/x86.c:2667:38: sparse: sparse: incorrect type in argument 1 (different address spaces) @@ expected void const [noderef] __user * @@ got unsigned char [usertype] * @@
>> arch/x86/kvm/x86.c:2667:38: sparse: expected void const [noderef] __user *
arch/x86/kvm/x86.c:2667:38: sparse: got unsigned char [usertype] *
arch/x86/kvm/x86.c:7630:15: sparse: sparse: incompatible types in comparison expression (different address spaces):
>> arch/x86/kvm/x86.c:7630:15: sparse: struct kvm_apic_map [noderef] __rcu *
arch/x86/kvm/x86.c:7630:15: sparse: struct kvm_apic_map *
arch/x86/kvm/x86.c:10004:16: sparse: sparse: incompatible types in comparison expression (different address spaces):
arch/x86/kvm/x86.c:10004:16: sparse: struct kvm_apic_map [noderef] __rcu *
arch/x86/kvm/x86.c:10004:16: sparse: struct kvm_apic_map *
arch/x86/kvm/x86.c:10005:15: sparse: sparse: incompatible types in comparison expression (different address spaces):
>> arch/x86/kvm/x86.c:10005:15: sparse: struct kvm_pmu_event_filter [noderef] __rcu *
arch/x86/kvm/x86.c:10005:15: sparse: struct kvm_pmu_event_filter *
arch/x86/kvm/x86.c: note: in included file (through include/linux/notifier.h, include/linux/memory_hotplug.h, include/linux/mmzone.h, ...):
include/linux/srcu.h:179:9: sparse: sparse: context imbalance in 'vcpu_enter_guest' - unexpected unlock
vim +255 arch/x86/kvm/lapic.c
3b5a5ffa928a3f8 Radim Krčmář 2015-02-12 171
4abaffce4d25aa4 Wanpeng Li 2020-02-26 172 void kvm_recalculate_apic_map(struct kvm *kvm)
1e08ec4a130e274 Gleb Natapov 2012-09-13 173 {
1e08ec4a130e274 Gleb Natapov 2012-09-13 174 struct kvm_apic_map *new, *old = NULL;
1e08ec4a130e274 Gleb Natapov 2012-09-13 175 struct kvm_vcpu *vcpu;
1e08ec4a130e274 Gleb Natapov 2012-09-13 176 int i;
6e50043912d9c9c Radim Krčmář 2016-12-15 177 u32 max_id = 255; /* enough space for any xAPIC ID */
1e08ec4a130e274 Gleb Natapov 2012-09-13 178
4abaffce4d25aa4 Wanpeng Li 2020-02-26 179 if (!kvm->arch.apic_map_dirty) {
4abaffce4d25aa4 Wanpeng Li 2020-02-26 180 /*
4abaffce4d25aa4 Wanpeng Li 2020-02-26 181 * Read kvm->arch.apic_map_dirty before
4abaffce4d25aa4 Wanpeng Li 2020-02-26 182 * kvm->arch.apic_map
4abaffce4d25aa4 Wanpeng Li 2020-02-26 183 */
4abaffce4d25aa4 Wanpeng Li 2020-02-26 184 smp_rmb();
4abaffce4d25aa4 Wanpeng Li 2020-02-26 185 return;
4abaffce4d25aa4 Wanpeng Li 2020-02-26 186 }
4abaffce4d25aa4 Wanpeng Li 2020-02-26 187
1e08ec4a130e274 Gleb Natapov 2012-09-13 188 mutex_lock(&kvm->arch.apic_map_lock);
4abaffce4d25aa4 Wanpeng Li 2020-02-26 189 if (!kvm->arch.apic_map_dirty) {
4abaffce4d25aa4 Wanpeng Li 2020-02-26 190 /* Someone else has updated the map. */
4abaffce4d25aa4 Wanpeng Li 2020-02-26 191 mutex_unlock(&kvm->arch.apic_map_lock);
4abaffce4d25aa4 Wanpeng Li 2020-02-26 192 return;
4abaffce4d25aa4 Wanpeng Li 2020-02-26 193 }
1e08ec4a130e274 Gleb Natapov 2012-09-13 194
0ca52e7b81a3726 Radim Krčmář 2016-07-12 195 kvm_for_each_vcpu(i, vcpu, kvm)
0ca52e7b81a3726 Radim Krčmář 2016-07-12 196 if (kvm_apic_present(vcpu))
6e50043912d9c9c Radim Krčmář 2016-12-15 197 max_id = max(max_id, kvm_x2apic_id(vcpu->arch.apic));
0ca52e7b81a3726 Radim Krčmář 2016-07-12 198
a7c3e901a46ff54 Michal Hocko 2017-05-08 199 new = kvzalloc(sizeof(struct kvm_apic_map) +
254272ce6505948 Ben Gardon 2019-02-11 200 sizeof(struct kvm_lapic *) * ((u64)max_id + 1),
254272ce6505948 Ben Gardon 2019-02-11 201 GFP_KERNEL_ACCOUNT);
0ca52e7b81a3726 Radim Krčmář 2016-07-12 202
1e08ec4a130e274 Gleb Natapov 2012-09-13 203 if (!new)
1e08ec4a130e274 Gleb Natapov 2012-09-13 204 goto out;
1e08ec4a130e274 Gleb Natapov 2012-09-13 205
0ca52e7b81a3726 Radim Krčmář 2016-07-12 206 new->max_apic_id = max_id;
0ca52e7b81a3726 Radim Krčmář 2016-07-12 207
173beedc1601f51 Nadav Amit 2014-11-02 208 kvm_for_each_vcpu(i, vcpu, kvm) {
173beedc1601f51 Nadav Amit 2014-11-02 209 struct kvm_lapic *apic = vcpu->arch.apic;
e45115b62f9abb1 Radim Krčmář 2016-07-12 210 struct kvm_lapic **cluster;
e45115b62f9abb1 Radim Krčmář 2016-07-12 211 u16 mask;
5bd5db385b3e13c Radim Krčmář 2016-12-15 212 u32 ldr;
5bd5db385b3e13c Radim Krčmář 2016-12-15 213 u8 xapic_id;
5bd5db385b3e13c Radim Krčmář 2016-12-15 214 u32 x2apic_id;
1e08ec4a130e274 Gleb Natapov 2012-09-13 215
df04d1d191a5fea Radim Krčmář 2015-01-29 216 if (!kvm_apic_present(vcpu))
df04d1d191a5fea Radim Krčmář 2015-01-29 217 continue;
df04d1d191a5fea Radim Krčmář 2015-01-29 218
5bd5db385b3e13c Radim Krčmář 2016-12-15 219 xapic_id = kvm_xapic_id(apic);
5bd5db385b3e13c Radim Krčmář 2016-12-15 220 x2apic_id = kvm_x2apic_id(apic);
5bd5db385b3e13c Radim Krčmář 2016-12-15 221
5bd5db385b3e13c Radim Krčmář 2016-12-15 222 /* Hotplug hack: see kvm_apic_match_physical_addr(), ... */
5bd5db385b3e13c Radim Krčmář 2016-12-15 223 if ((apic_x2apic_mode(apic) || x2apic_id > 0xff) &&
5bd5db385b3e13c Radim Krčmář 2016-12-15 224 x2apic_id <= new->max_apic_id)
5bd5db385b3e13c Radim Krčmář 2016-12-15 225 new->phys_map[x2apic_id] = apic;
5bd5db385b3e13c Radim Krčmář 2016-12-15 226 /*
5bd5db385b3e13c Radim Krčmář 2016-12-15 227 * ... xAPIC ID of VCPUs with APIC ID > 0xff will wrap-around,
5bd5db385b3e13c Radim Krčmář 2016-12-15 228 * prevent them from masking VCPUs with APIC ID <= 0xff.
5bd5db385b3e13c Radim Krčmář 2016-12-15 229 */
5bd5db385b3e13c Radim Krčmář 2016-12-15 230 if (!apic_x2apic_mode(apic) && !new->phys_map[xapic_id])
5bd5db385b3e13c Radim Krčmář 2016-12-15 231 new->phys_map[xapic_id] = apic;
3548a259f6990d8 Radim Krčmář 2015-02-12 232
b14c876b994f208 Radim Krcmar 2019-08-13 233 if (!kvm_apic_sw_enabled(apic))
b14c876b994f208 Radim Krcmar 2019-08-13 234 continue;
b14c876b994f208 Radim Krcmar 2019-08-13 235
6e50043912d9c9c Radim Krčmář 2016-12-15 236 ldr = kvm_lapic_get_reg(apic, APIC_LDR);
6e50043912d9c9c Radim Krčmář 2016-12-15 237
3b5a5ffa928a3f8 Radim Krčmář 2015-02-12 238 if (apic_x2apic_mode(apic)) {
3b5a5ffa928a3f8 Radim Krčmář 2015-02-12 239 new->mode |= KVM_APIC_MODE_X2APIC;
3b5a5ffa928a3f8 Radim Krčmář 2015-02-12 240 } else if (ldr) {
3b5a5ffa928a3f8 Radim Krčmář 2015-02-12 241 ldr = GET_APIC_LOGICAL_ID(ldr);
dfb9595429c65f7 Suravee Suthikulpanit 2016-05-04 242 if (kvm_lapic_get_reg(apic, APIC_DFR) == APIC_DFR_FLAT)
3b5a5ffa928a3f8 Radim Krčmář 2015-02-12 243 new->mode |= KVM_APIC_MODE_XAPIC_FLAT;
3b5a5ffa928a3f8 Radim Krčmář 2015-02-12 244 else
3b5a5ffa928a3f8 Radim Krčmář 2015-02-12 245 new->mode |= KVM_APIC_MODE_XAPIC_CLUSTER;
3b5a5ffa928a3f8 Radim Krčmář 2015-02-12 246 }
3b5a5ffa928a3f8 Radim Krčmář 2015-02-12 247
e45115b62f9abb1 Radim Krčmář 2016-07-12 248 if (!kvm_apic_map_get_logical_dest(new, ldr, &cluster, &mask))
3548a259f6990d8 Radim Krčmář 2015-02-12 249 continue;
3548a259f6990d8 Radim Krčmář 2015-02-12 250
e45115b62f9abb1 Radim Krčmář 2016-07-12 251 if (mask)
e45115b62f9abb1 Radim Krčmář 2016-07-12 252 cluster[ffs(mask) - 1] = apic;
1e08ec4a130e274 Gleb Natapov 2012-09-13 253 }
1e08ec4a130e274 Gleb Natapov 2012-09-13 254 out:
1e08ec4a130e274 Gleb Natapov 2012-09-13 @255 old = rcu_dereference_protected(kvm->arch.apic_map,
1e08ec4a130e274 Gleb Natapov 2012-09-13 256 lockdep_is_held(&kvm->arch.apic_map_lock));
1e08ec4a130e274 Gleb Natapov 2012-09-13 257 rcu_assign_pointer(kvm->arch.apic_map, new);
4abaffce4d25aa4 Wanpeng Li 2020-02-26 258 /*
4abaffce4d25aa4 Wanpeng Li 2020-02-26 259 * Write kvm->arch.apic_map before
4abaffce4d25aa4 Wanpeng Li 2020-02-26 260 * clearing apic->apic_map_dirty
4abaffce4d25aa4 Wanpeng Li 2020-02-26 261 */
4abaffce4d25aa4 Wanpeng Li 2020-02-26 262 smp_wmb();
4abaffce4d25aa4 Wanpeng Li 2020-02-26 263 kvm->arch.apic_map_dirty = false;
1e08ec4a130e274 Gleb Natapov 2012-09-13 264 mutex_unlock(&kvm->arch.apic_map_lock);
1e08ec4a130e274 Gleb Natapov 2012-09-13 265
1e08ec4a130e274 Gleb Natapov 2012-09-13 266 if (old)
af1bae5497b98cb Radim Krčmář 2016-07-12 267 call_rcu(&old->rcu, kvm_apic_map_free);
c7c9c56ca26f7b9 Yang Zhang 2013-01-25 268
b053b2aef25d007 Steve Rutherford 2015-07-29 269 kvm_make_scan_ioapic_request(kvm);
1e08ec4a130e274 Gleb Natapov 2012-09-13 270 }
1e08ec4a130e274 Gleb Natapov 2012-09-13 271
:::::: The code at line 255 was first introduced by commit
:::::: 1e08ec4a130e2745d96df169e67c58df98a07311 KVM: optimize apic interrupt delivery
:::::: TO: Gleb Natapov <gleb@redhat.com>
:::::: CC: Avi Kivity <avi@redhat.com>
---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org
[-- Attachment #2: .config.gz --]
[-- Type: application/gzip, Size: 28937 bytes --]
^ permalink raw reply [flat|nested] 2+ messages in thread
* arch/x86/kvm/lapic.c:255:15: sparse: struct kvm_apic_map __rcu COPYING CREDITS Documentation Kbuild Kconfig LICENSES MAINTAINERS Makefile README arch block certs crypto drivers fs include init ipc kernel lib mm net samples scripts security sound tools usr virt
@ 2020-07-24 2:07 ` kernel test robot
0 siblings, 0 replies; 2+ messages in thread
From: kernel test robot @ 2020-07-24 2:07 UTC (permalink / raw)
To: kbuild-all
[-- Attachment #1: Type: text/plain, Size: 13581 bytes --]
tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head: d15be546031cf65a0fc34879beca02fd90fe7ac7
commit: 670d0a4b10704667765f7d18f7592993d02783aa sparse: use identifiers to define address spaces
date: 5 weeks ago
config: i386-randconfig-s002-20200724 (attached as .config)
compiler: gcc-9 (Debian 9.3.0-14) 9.3.0
reproduce:
# apt-get install sparse
# sparse version: v0.6.2-93-g4c6cbe55-dirty
git checkout 670d0a4b10704667765f7d18f7592993d02783aa
# save the attached .config to linux build tree
make W=1 C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' ARCH=i386
If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@intel.com>
sparse warnings: (new ones prefixed by >>)
arch/x86/kvm/lapic.c:255:15: sparse: sparse: incompatible types in comparison expression (different address spaces):
>> arch/x86/kvm/lapic.c:255:15: sparse: struct kvm_apic_map [noderef] __rcu *
arch/x86/kvm/lapic.c:255:15: sparse: struct kvm_apic_map *
arch/x86/kvm/lapic.c:257:9: sparse: sparse: incompatible types in comparison expression (different address spaces):
arch/x86/kvm/lapic.c:257:9: sparse: struct kvm_apic_map [noderef] __rcu *
arch/x86/kvm/lapic.c:257:9: sparse: struct kvm_apic_map *
arch/x86/kvm/lapic.c:615:15: sparse: sparse: incompatible types in comparison expression (different address spaces):
arch/x86/kvm/lapic.c:615:15: sparse: struct kvm_apic_map [noderef] __rcu *
arch/x86/kvm/lapic.c:615:15: sparse: struct kvm_apic_map *
arch/x86/kvm/lapic.c:972:15: sparse: sparse: incompatible types in comparison expression (different address spaces):
arch/x86/kvm/lapic.c:972:15: sparse: struct kvm_apic_map [noderef] __rcu *
arch/x86/kvm/lapic.c:972:15: sparse: struct kvm_apic_map *
arch/x86/kvm/lapic.c:1014:15: sparse: sparse: incompatible types in comparison expression (different address spaces):
arch/x86/kvm/lapic.c:1014:15: sparse: struct kvm_apic_map [noderef] __rcu *
arch/x86/kvm/lapic.c:1014:15: sparse: struct kvm_apic_map *
arch/x86/kvm/lapic.c:1151:15: sparse: sparse: incompatible types in comparison expression (different address spaces):
arch/x86/kvm/lapic.c:1151:15: sparse: struct kvm_apic_map [noderef] __rcu *
arch/x86/kvm/lapic.c:1151:15: sparse: struct kvm_apic_map *
--
arch/x86/kvm/pmu.c:190:18: sparse: sparse: incompatible types in comparison expression (different address spaces):
>> arch/x86/kvm/pmu.c:190:18: sparse: struct kvm_pmu_event_filter [noderef] __rcu *
arch/x86/kvm/pmu.c:190:18: sparse: struct kvm_pmu_event_filter *
arch/x86/kvm/pmu.c:251:18: sparse: sparse: incompatible types in comparison expression (different address spaces):
arch/x86/kvm/pmu.c:251:18: sparse: struct kvm_pmu_event_filter [noderef] __rcu *
arch/x86/kvm/pmu.c:251:18: sparse: struct kvm_pmu_event_filter *
arch/x86/kvm/pmu.c:511:18: sparse: sparse: incompatible types in comparison expression (different address spaces):
arch/x86/kvm/pmu.c:511:18: sparse: struct kvm_pmu_event_filter [noderef] __rcu *
arch/x86/kvm/pmu.c:511:18: sparse: struct kvm_pmu_event_filter *
arch/x86/kvm/pmu.c:511:18: sparse: sparse: incompatible types in comparison expression (different address spaces):
arch/x86/kvm/pmu.c:511:18: sparse: struct kvm_pmu_event_filter [noderef] __rcu *
arch/x86/kvm/pmu.c:511:18: sparse: struct kvm_pmu_event_filter *
--
>> arch/x86/kvm/x86.c:2667:38: sparse: sparse: incorrect type in argument 1 (different address spaces) @@ expected void const [noderef] __user * @@ got unsigned char [usertype] * @@
>> arch/x86/kvm/x86.c:2667:38: sparse: expected void const [noderef] __user *
arch/x86/kvm/x86.c:2667:38: sparse: got unsigned char [usertype] *
arch/x86/kvm/x86.c:7630:15: sparse: sparse: incompatible types in comparison expression (different address spaces):
>> arch/x86/kvm/x86.c:7630:15: sparse: struct kvm_apic_map [noderef] __rcu *
arch/x86/kvm/x86.c:7630:15: sparse: struct kvm_apic_map *
arch/x86/kvm/x86.c:10004:16: sparse: sparse: incompatible types in comparison expression (different address spaces):
arch/x86/kvm/x86.c:10004:16: sparse: struct kvm_apic_map [noderef] __rcu *
arch/x86/kvm/x86.c:10004:16: sparse: struct kvm_apic_map *
arch/x86/kvm/x86.c:10005:15: sparse: sparse: incompatible types in comparison expression (different address spaces):
>> arch/x86/kvm/x86.c:10005:15: sparse: struct kvm_pmu_event_filter [noderef] __rcu *
arch/x86/kvm/x86.c:10005:15: sparse: struct kvm_pmu_event_filter *
arch/x86/kvm/x86.c: note: in included file (through include/linux/notifier.h, include/linux/memory_hotplug.h, include/linux/mmzone.h, ...):
include/linux/srcu.h:179:9: sparse: sparse: context imbalance in 'vcpu_enter_guest' - unexpected unlock
vim +255 arch/x86/kvm/lapic.c
3b5a5ffa928a3f8 Radim Krčmář 2015-02-12 171
4abaffce4d25aa4 Wanpeng Li 2020-02-26 172 void kvm_recalculate_apic_map(struct kvm *kvm)
1e08ec4a130e274 Gleb Natapov 2012-09-13 173 {
1e08ec4a130e274 Gleb Natapov 2012-09-13 174 struct kvm_apic_map *new, *old = NULL;
1e08ec4a130e274 Gleb Natapov 2012-09-13 175 struct kvm_vcpu *vcpu;
1e08ec4a130e274 Gleb Natapov 2012-09-13 176 int i;
6e50043912d9c9c Radim Krčmář 2016-12-15 177 u32 max_id = 255; /* enough space for any xAPIC ID */
1e08ec4a130e274 Gleb Natapov 2012-09-13 178
4abaffce4d25aa4 Wanpeng Li 2020-02-26 179 if (!kvm->arch.apic_map_dirty) {
4abaffce4d25aa4 Wanpeng Li 2020-02-26 180 /*
4abaffce4d25aa4 Wanpeng Li 2020-02-26 181 * Read kvm->arch.apic_map_dirty before
4abaffce4d25aa4 Wanpeng Li 2020-02-26 182 * kvm->arch.apic_map
4abaffce4d25aa4 Wanpeng Li 2020-02-26 183 */
4abaffce4d25aa4 Wanpeng Li 2020-02-26 184 smp_rmb();
4abaffce4d25aa4 Wanpeng Li 2020-02-26 185 return;
4abaffce4d25aa4 Wanpeng Li 2020-02-26 186 }
4abaffce4d25aa4 Wanpeng Li 2020-02-26 187
1e08ec4a130e274 Gleb Natapov 2012-09-13 188 mutex_lock(&kvm->arch.apic_map_lock);
4abaffce4d25aa4 Wanpeng Li 2020-02-26 189 if (!kvm->arch.apic_map_dirty) {
4abaffce4d25aa4 Wanpeng Li 2020-02-26 190 /* Someone else has updated the map. */
4abaffce4d25aa4 Wanpeng Li 2020-02-26 191 mutex_unlock(&kvm->arch.apic_map_lock);
4abaffce4d25aa4 Wanpeng Li 2020-02-26 192 return;
4abaffce4d25aa4 Wanpeng Li 2020-02-26 193 }
1e08ec4a130e274 Gleb Natapov 2012-09-13 194
0ca52e7b81a3726 Radim Krčmář 2016-07-12 195 kvm_for_each_vcpu(i, vcpu, kvm)
0ca52e7b81a3726 Radim Krčmář 2016-07-12 196 if (kvm_apic_present(vcpu))
6e50043912d9c9c Radim Krčmář 2016-12-15 197 max_id = max(max_id, kvm_x2apic_id(vcpu->arch.apic));
0ca52e7b81a3726 Radim Krčmář 2016-07-12 198
a7c3e901a46ff54 Michal Hocko 2017-05-08 199 new = kvzalloc(sizeof(struct kvm_apic_map) +
254272ce6505948 Ben Gardon 2019-02-11 200 sizeof(struct kvm_lapic *) * ((u64)max_id + 1),
254272ce6505948 Ben Gardon 2019-02-11 201 GFP_KERNEL_ACCOUNT);
0ca52e7b81a3726 Radim Krčmář 2016-07-12 202
1e08ec4a130e274 Gleb Natapov 2012-09-13 203 if (!new)
1e08ec4a130e274 Gleb Natapov 2012-09-13 204 goto out;
1e08ec4a130e274 Gleb Natapov 2012-09-13 205
0ca52e7b81a3726 Radim Krčmář 2016-07-12 206 new->max_apic_id = max_id;
0ca52e7b81a3726 Radim Krčmář 2016-07-12 207
173beedc1601f51 Nadav Amit 2014-11-02 208 kvm_for_each_vcpu(i, vcpu, kvm) {
173beedc1601f51 Nadav Amit 2014-11-02 209 struct kvm_lapic *apic = vcpu->arch.apic;
e45115b62f9abb1 Radim Krčmář 2016-07-12 210 struct kvm_lapic **cluster;
e45115b62f9abb1 Radim Krčmář 2016-07-12 211 u16 mask;
5bd5db385b3e13c Radim Krčmář 2016-12-15 212 u32 ldr;
5bd5db385b3e13c Radim Krčmář 2016-12-15 213 u8 xapic_id;
5bd5db385b3e13c Radim Krčmář 2016-12-15 214 u32 x2apic_id;
1e08ec4a130e274 Gleb Natapov 2012-09-13 215
df04d1d191a5fea Radim Krčmář 2015-01-29 216 if (!kvm_apic_present(vcpu))
df04d1d191a5fea Radim Krčmář 2015-01-29 217 continue;
df04d1d191a5fea Radim Krčmář 2015-01-29 218
5bd5db385b3e13c Radim Krčmář 2016-12-15 219 xapic_id = kvm_xapic_id(apic);
5bd5db385b3e13c Radim Krčmář 2016-12-15 220 x2apic_id = kvm_x2apic_id(apic);
5bd5db385b3e13c Radim Krčmář 2016-12-15 221
5bd5db385b3e13c Radim Krčmář 2016-12-15 222 /* Hotplug hack: see kvm_apic_match_physical_addr(), ... */
5bd5db385b3e13c Radim Krčmář 2016-12-15 223 if ((apic_x2apic_mode(apic) || x2apic_id > 0xff) &&
5bd5db385b3e13c Radim Krčmář 2016-12-15 224 x2apic_id <= new->max_apic_id)
5bd5db385b3e13c Radim Krčmář 2016-12-15 225 new->phys_map[x2apic_id] = apic;
5bd5db385b3e13c Radim Krčmář 2016-12-15 226 /*
5bd5db385b3e13c Radim Krčmář 2016-12-15 227 * ... xAPIC ID of VCPUs with APIC ID > 0xff will wrap-around,
5bd5db385b3e13c Radim Krčmář 2016-12-15 228 * prevent them from masking VCPUs with APIC ID <= 0xff.
5bd5db385b3e13c Radim Krčmář 2016-12-15 229 */
5bd5db385b3e13c Radim Krčmář 2016-12-15 230 if (!apic_x2apic_mode(apic) && !new->phys_map[xapic_id])
5bd5db385b3e13c Radim Krčmář 2016-12-15 231 new->phys_map[xapic_id] = apic;
3548a259f6990d8 Radim Krčmář 2015-02-12 232
b14c876b994f208 Radim Krcmar 2019-08-13 233 if (!kvm_apic_sw_enabled(apic))
b14c876b994f208 Radim Krcmar 2019-08-13 234 continue;
b14c876b994f208 Radim Krcmar 2019-08-13 235
6e50043912d9c9c Radim Krčmář 2016-12-15 236 ldr = kvm_lapic_get_reg(apic, APIC_LDR);
6e50043912d9c9c Radim Krčmář 2016-12-15 237
3b5a5ffa928a3f8 Radim Krčmář 2015-02-12 238 if (apic_x2apic_mode(apic)) {
3b5a5ffa928a3f8 Radim Krčmář 2015-02-12 239 new->mode |= KVM_APIC_MODE_X2APIC;
3b5a5ffa928a3f8 Radim Krčmář 2015-02-12 240 } else if (ldr) {
3b5a5ffa928a3f8 Radim Krčmář 2015-02-12 241 ldr = GET_APIC_LOGICAL_ID(ldr);
dfb9595429c65f7 Suravee Suthikulpanit 2016-05-04 242 if (kvm_lapic_get_reg(apic, APIC_DFR) == APIC_DFR_FLAT)
3b5a5ffa928a3f8 Radim Krčmář 2015-02-12 243 new->mode |= KVM_APIC_MODE_XAPIC_FLAT;
3b5a5ffa928a3f8 Radim Krčmář 2015-02-12 244 else
3b5a5ffa928a3f8 Radim Krčmář 2015-02-12 245 new->mode |= KVM_APIC_MODE_XAPIC_CLUSTER;
3b5a5ffa928a3f8 Radim Krčmář 2015-02-12 246 }
3b5a5ffa928a3f8 Radim Krčmář 2015-02-12 247
e45115b62f9abb1 Radim Krčmář 2016-07-12 248 if (!kvm_apic_map_get_logical_dest(new, ldr, &cluster, &mask))
3548a259f6990d8 Radim Krčmář 2015-02-12 249 continue;
3548a259f6990d8 Radim Krčmář 2015-02-12 250
e45115b62f9abb1 Radim Krčmář 2016-07-12 251 if (mask)
e45115b62f9abb1 Radim Krčmář 2016-07-12 252 cluster[ffs(mask) - 1] = apic;
1e08ec4a130e274 Gleb Natapov 2012-09-13 253 }
1e08ec4a130e274 Gleb Natapov 2012-09-13 254 out:
1e08ec4a130e274 Gleb Natapov 2012-09-13 @255 old = rcu_dereference_protected(kvm->arch.apic_map,
1e08ec4a130e274 Gleb Natapov 2012-09-13 256 lockdep_is_held(&kvm->arch.apic_map_lock));
1e08ec4a130e274 Gleb Natapov 2012-09-13 257 rcu_assign_pointer(kvm->arch.apic_map, new);
4abaffce4d25aa4 Wanpeng Li 2020-02-26 258 /*
4abaffce4d25aa4 Wanpeng Li 2020-02-26 259 * Write kvm->arch.apic_map before
4abaffce4d25aa4 Wanpeng Li 2020-02-26 260 * clearing apic->apic_map_dirty
4abaffce4d25aa4 Wanpeng Li 2020-02-26 261 */
4abaffce4d25aa4 Wanpeng Li 2020-02-26 262 smp_wmb();
4abaffce4d25aa4 Wanpeng Li 2020-02-26 263 kvm->arch.apic_map_dirty = false;
1e08ec4a130e274 Gleb Natapov 2012-09-13 264 mutex_unlock(&kvm->arch.apic_map_lock);
1e08ec4a130e274 Gleb Natapov 2012-09-13 265
1e08ec4a130e274 Gleb Natapov 2012-09-13 266 if (old)
af1bae5497b98cb Radim Krčmář 2016-07-12 267 call_rcu(&old->rcu, kvm_apic_map_free);
c7c9c56ca26f7b9 Yang Zhang 2013-01-25 268
b053b2aef25d007 Steve Rutherford 2015-07-29 269 kvm_make_scan_ioapic_request(kvm);
1e08ec4a130e274 Gleb Natapov 2012-09-13 270 }
1e08ec4a130e274 Gleb Natapov 2012-09-13 271
:::::: The code at line 255 was first introduced by commit
:::::: 1e08ec4a130e2745d96df169e67c58df98a07311 KVM: optimize apic interrupt delivery
:::::: TO: Gleb Natapov <gleb@redhat.com>
:::::: CC: Avi Kivity <avi@redhat.com>
---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all(a)lists.01.org
[-- Attachment #2: config.gz --]
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