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linux_dsm_epyc7002/arch/powerpc/kvm
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Aneesh Kumar K.V c1ed1754f2 powerpc/kvm/book3s64: Fix kernel crash with nested kvm & DEBUG_VIRTUAL 
With CONFIG_DEBUG_VIRTUAL=y, __pa() checks for addr value and if it's
less than PAGE_OFFSET it leads to a BUG().

  #define __pa(x)
  ({
  	VIRTUAL_BUG_ON((unsigned long)(x) < PAGE_OFFSET);
  	(unsigned long)(x) & 0x0fffffffffffffffUL;
  })

  kernel BUG at arch/powerpc/kvm/book3s_64_mmu_radix.c:43!
  cpu 0x70: Vector: 700 (Program Check) at [c0000018a2187360]
      pc: c000000000161b30: __kvmhv_copy_tofrom_guest_radix+0x130/0x1f0
      lr: c000000000161d5c: kvmhv_copy_from_guest_radix+0x3c/0x80
  ...
  kvmhv_copy_from_guest_radix+0x3c/0x80
  kvmhv_load_from_eaddr+0x48/0xc0
  kvmppc_ld+0x98/0x1e0
  kvmppc_load_last_inst+0x50/0x90
  kvmppc_hv_emulate_mmio+0x288/0x2b0
  kvmppc_book3s_radix_page_fault+0xd8/0x2b0
  kvmppc_book3s_hv_page_fault+0x37c/0x1050
  kvmppc_vcpu_run_hv+0xbb8/0x1080
  kvmppc_vcpu_run+0x34/0x50
  kvm_arch_vcpu_ioctl_run+0x2fc/0x410
  kvm_vcpu_ioctl+0x2b4/0x8f0
  ksys_ioctl+0xf4/0x150
  sys_ioctl+0x28/0x80
  system_call_exception+0x104/0x1d0
  system_call_common+0xe8/0x214

kvmhv_copy_tofrom_guest_radix() uses a NULL value for to/from to
indicate direction of copy.

Avoid calling __pa() if the value is NULL to avoid the BUG().

Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.ibm.com>
[mpe: Massage change log a bit to mention CONFIG_DEBUG_VIRTUAL]
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20200611120159.680284-1-aneesh.kumar@linux.ibm.com
2020-06-22 21:55:45 +10:00
..
book3s_32_mmu_host.c KVM: PPC: Book3S PR: Move kvmppc_mmu_init() into PR KVM 2020-03-19 16:39:52 +11:00
book3s_32_mmu.c KVM: PPC: Use fallthrough; 2020-03-19 16:39:52 +11:00
book3s_32_sr.S treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 266 2019-06-05 17:30:28 +02:00
book3s_64_mmu_host.c KVM: PPC: Book3S PR: Move kvmppc_mmu_init() into PR KVM 2020-03-19 16:39:52 +11:00
book3s_64_mmu_hv.c MIPS: 2020-06-12 11:05:52 -07:00
book3s_64_mmu_radix.c powerpc/kvm/book3s64: Fix kernel crash with nested kvm & DEBUG_VIRTUAL 2020-06-22 21:55:45 +10:00
book3s_64_mmu.c KVM: PPC: Use fallthrough; 2020-03-19 16:39:52 +11:00
book3s_64_slb.S treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 266 2019-06-05 17:30:28 +02:00
book3s_64_vio_hv.c powerpc: Replace _ALIGN_UP() by ALIGN() 2020-05-11 23:15:15 +10:00
book3s_64_vio.c KVM: PPC: Book3S: Fix some RCU-list locks 2020-05-27 11:39:31 +10:00
book3s_emulate.c KVM: PPC: Clean up redundant 'kvm_run' parameters 2020-05-27 11:39:31 +10:00
book3s_exports.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 266 2019-06-05 17:30:28 +02:00
book3s_hv_builtin.c KVM: PPC: Book3S HV: Implement LPCR[AIL]=3 mode for injected interrupts 2019-10-22 16:29:02 +11:00
book3s_hv_hmi.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 114 2019-05-24 17:39:01 +02:00
book3s_hv_interrupts.S treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 266 2019-06-05 17:30:28 +02:00
book3s_hv_nested.c powerpc fixes for 5.8 #2 2020-06-13 10:56:31 -07:00
book3s_hv_ras.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500 2019-06-19 17:09:55 +02:00
book3s_hv_rm_mmu.c powerpc: Define new SRR1 bits for a ISA v3.1 2020-05-19 00:10:38 +10:00
book3s_hv_rm_xics.c mm: reorder includes after introduction of linux/pgtable.h 2020-06-09 09:39:13 -07:00
book3s_hv_rm_xive.c mm: reorder includes after introduction of linux/pgtable.h 2020-06-09 09:39:13 -07:00
book3s_hv_rmhandlers.S Merge branch 'topic/ppc-kvm' into next 2020-05-20 23:38:13 +10:00
book3s_hv_tm_builtin.c KVM: PPC: Book3S HV: Treat TM-related invalid form instructions on P9 like the valid ones 2020-03-19 16:39:52 +11:00
book3s_hv_tm.c KVM: PPC: Book3S HV: Treat TM-related invalid form instructions on P9 like the valid ones 2020-03-19 16:39:52 +11:00
book3s_hv_uvmem.c MIPS: 2020-06-12 11:05:52 -07:00
book3s_hv.c MIPS: 2020-06-12 11:05:52 -07:00
book3s_interrupts.S treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 266 2019-06-05 17:30:28 +02:00
book3s_mmu_hpte.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 266 2019-06-05 17:30:28 +02:00
book3s_paired_singles.c KVM: PPC: Clean up redundant 'kvm_run' parameters 2020-05-27 11:39:31 +10:00
book3s_pr_papr.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500 2019-06-19 17:09:55 +02:00
book3s_pr.c KVM: PPC: Clean up redundant 'kvm_run' parameters 2020-05-27 11:39:31 +10:00
book3s_rmhandlers.S treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 266 2019-06-05 17:30:28 +02:00
book3s_rtas.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500 2019-06-19 17:09:55 +02:00
book3s_segment.S powerpc/64s/exception: Move KVM test to common code 2020-04-01 13:42:11 +11:00
book3s_xics.c scripts/spelling.txt: drop "sepc" from the misspelling list 2019-07-12 11:05:41 -07:00
book3s_xics.h treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500 2019-06-19 17:09:55 +02:00
book3s_xive_native.c powerpc/xive: Enforce load-after-store ordering when StoreEOI is active 2020-05-07 22:58:31 +10:00
book3s_xive_template.c powerpc/xive: Enforce load-after-store ordering when StoreEOI is active 2020-05-07 22:58:31 +10:00
book3s_xive.c KVM: PPC: Book3S HV: XIVE: Fix typo in comment 2020-01-23 21:31:23 +11:00
book3s_xive.h KVM: PPC: Book3S HV: XIVE: Make VP block size configurable 2019-10-22 16:29:02 +11:00
book3s.c KVM: PPC: Clean up redundant 'kvm_run' parameters 2020-05-27 11:39:31 +10:00
book3s.h KVM: PPC: Clean up redundant 'kvm_run' parameters 2020-05-27 11:39:31 +10:00
booke_emulate.c KVM: PPC: Clean up redundant 'kvm_run' parameters 2020-05-27 11:39:31 +10:00
booke_interrupts.S treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 266 2019-06-05 17:30:28 +02:00
booke.c KVM: PPC: Clean up redundant 'kvm_run' parameters 2020-05-27 11:39:31 +10:00
booke.h KVM: PPC: Clean up redundant 'kvm_run' parameters 2020-05-27 11:39:31 +10:00
bookehv_interrupts.S treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 266 2019-06-05 17:30:28 +02:00
e500_emulate.c KVM: PPC: Clean up redundant 'kvm_run' parameters 2020-05-27 11:39:31 +10:00
e500_mmu_host.c mmap locking API: use coccinelle to convert mmap_sem rwsem call sites 2020-06-09 09:39:14 -07:00
e500_mmu_host.h treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500 2019-06-19 17:09:55 +02:00
e500_mmu.c KVM: PPC: Kill kvmppc_ops::mmu_destroy() and kvmppc_mmu_destroy() 2020-03-19 16:43:07 +11:00
e500.c KVM: PPC: Kill kvmppc_ops::mmu_destroy() and kvmppc_mmu_destroy() 2020-03-19 16:43:07 +11:00
e500.h treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500 2019-06-19 17:09:55 +02:00
e500mc.c KVM: PPC: Kill kvmppc_ops::mmu_destroy() and kvmppc_mmu_destroy() 2020-03-19 16:43:07 +11:00
emulate_loadstore.c MIPS: 2020-06-12 11:05:52 -07:00
emulate.c KVM: PPC: Clean up redundant 'kvm_run' parameters 2020-05-27 11:39:31 +10:00
fpu.S mm: reorder includes after introduction of linux/pgtable.h 2020-06-09 09:39:13 -07:00
irq.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
Kconfig treewide: replace '---help---' in Kconfig files with 'help' 2020-06-14 01:57:21 +09:00
Makefile KVM: PPC: Book3S HV: Support for running secure guests 2019-11-28 16:30:02 +11:00
mpic.c KVM: Remove unnecessary asm/kvm_host.h includes 2020-03-16 17:57:34 +01:00
powerpc.c KVM: PPC: Clean up redundant 'kvm_run' parameters 2020-05-27 11:39:31 +10:00
timing.c powerpc/kvm: no need to check return value of debugfs_create functions 2020-03-04 22:44:25 +11:00
timing.h KVM: Remove unnecessary asm/kvm_host.h includes 2020-03-16 17:57:34 +01:00
tm.S treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 174 2019-05-30 11:26:41 -07:00
trace_book3s.h KVM: PPC: Book3S: Simplify external interrupt handling 2018-10-09 16:04:27 +11:00
trace_booke.h KVM: PPC: Move and undef TRACE_INCLUDE_PATH/FILE 2018-11-07 23:04:38 +11:00
trace_hv.h KVM: PPC: Clean up redundant 'kvm_run' parameters 2020-05-27 11:39:31 +10:00
trace_pr.h KVM: PPC: Move and undef TRACE_INCLUDE_PATH/FILE 2018-11-07 23:04:38 +11:00
trace.h KVM: PPC: Move and undef TRACE_INCLUDE_PATH/FILE 2018-11-07 23:04:38 +11:00