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d2263de137
linux/arch/x86/kvm
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Yuan Yao d2263de137 KVM: x86/mmu: Set memory encryption "value", not "mask", in shadow PDPTRs 
Assign shadow_me_value, not shadow_me_mask, to PAE root entries,
a.k.a. shadow PDPTRs, when host memory encryption is supported.  The
"mask" is the set of all possible memory encryption bits, e.g. MKTME
KeyIDs, whereas "value" holds the actual value that needs to be
stuffed into host page tables.

Using shadow_me_mask results in a failed VM-Entry due to setting
reserved PA bits in the PDPTRs, and ultimately causes an OOPS due to
physical addresses with non-zero MKTME bits sending to_shadow_page()
into the weeds:

set kvm_intel.dump_invalid_vmcs=1 to dump internal KVM state.
BUG: unable to handle page fault for address: ffd43f00063049e8
PGD 86dfd8067 P4D 0
Oops: 0000 [#1] PREEMPT SMP
RIP: 0010:mmu_free_root_page+0x3c/0x90 [kvm]
 kvm_mmu_free_roots+0xd1/0x200 [kvm]
 __kvm_mmu_unload+0x29/0x70 [kvm]
 kvm_mmu_unload+0x13/0x20 [kvm]
 kvm_arch_destroy_vm+0x8a/0x190 [kvm]
 kvm_put_kvm+0x197/0x2d0 [kvm]
 kvm_vm_release+0x21/0x30 [kvm]
 __fput+0x8e/0x260
 ____fput+0xe/0x10
 task_work_run+0x6f/0xb0
 do_exit+0x327/0xa90
 do_group_exit+0x35/0xa0
 get_signal+0x911/0x930
 arch_do_signal_or_restart+0x37/0x720
 exit_to_user_mode_prepare+0xb2/0x140
 syscall_exit_to_user_mode+0x16/0x30
 do_syscall_64+0x4e/0x90
 entry_SYSCALL_64_after_hwframe+0x44/0xae

Fixes: e54f1ff244 ("KVM: x86/mmu: Add shadow_me_value and repurpose shadow_me_mask")
Signed-off-by: Yuan Yao <yuan.yao@intel.com>
Reviewed-by: Kai Huang <kai.huang@intel.com>
Message-Id: <20220608012015.19566-1-yuan.yao@intel.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2022-06-09 10:52:16 -04:00
..
mmu KVM: x86/mmu: Set memory encryption "value", not "mask", in shadow PDPTRs 2022-06-09 10:52:16 -04:00
svm KVM/riscv fixes for 5.19, take #1 2022-06-09 09:45:00 -04:00
vmx KVM/riscv fixes for 5.19, take #1 2022-06-09 09:45:00 -04:00
cpuid.c KVM/arm64 updates for 5.19 2022-05-25 05:09:23 -04:00
cpuid.h kvm: x86: Add support for getting/setting expanded xstate buffer 2022-01-14 13:44:41 -05:00
debugfs.c Merge branch 'kvm-pi-raw-spinlock' into HEAD 2022-01-19 12:14:02 -05:00
emulate.c * Only do MSR filtering for MSRs accessed by rdmsr/wrmsr 2022-04-02 12:09:02 -07:00
fpu.h KVM: x86: Move FPU register accessors into fpu.h 2021-06-17 13:09:24 -04:00
hyperv.c Bitmap patches for 5.19-rc1 2022-06-04 14:04:27 -07:00
hyperv.h KVM: x86: hyper-v: Avoid writing to TSC page without an active vCPU 2022-04-11 13:29:51 -04:00
i8254.c KVM: x86: Add wrappers for setting/clearing APICv inhibits 2022-04-02 05:34:44 -04:00
i8254.h
i8259.c KVM: x86/i8259: Remove a dead store of irq in a conditional block 2022-04-02 05:41:19 -04:00
ioapic.c KVM: x86/ioapic: Remove unused "addr" and "length" of ioapic_read_indirect() 2022-02-10 13:47:13 -05:00
ioapic.h x86/kvm: remove unused ack_notifier callbacks 2021-11-18 07:05:57 -05:00
irq_comm.c KVM: x86/xen: Make kvm_xen_set_evtchn() reusable from other places 2022-04-02 05:41:14 -04:00
irq.c KVM: x86/xen: handle PV timers oneshot mode 2022-04-02 05:41:16 -04:00
irq.h x86/kvm: remove unused ack_notifier callbacks 2021-11-18 07:05:57 -05:00
Kconfig KVM: x86/mmu: Remove MMU auditing 2022-02-18 13:46:23 -05:00
kvm_cache_regs.h KVM: X86: Remove kvm_register_clear_available() 2021-12-08 04:25:03 -05:00
kvm_emulate.h * Only do MSR filtering for MSRs accessed by rdmsr/wrmsr 2022-04-02 12:09:02 -07:00
kvm_onhyperv.c KVM: x86: Uninline and export hv_track_root_tdp() 2022-02-10 13:47:19 -05:00
kvm_onhyperv.h KVM: x86: Uninline and export hv_track_root_tdp() 2022-02-10 13:47:19 -05:00
lapic.c KVM: LAPIC: Drop pending LAPIC timer injection when canceling the timer 2022-05-25 05:12:35 -04:00
lapic.h KVM: LAPIC: Trace LAPIC timer expiration on every vmentry 2022-05-25 05:07:09 -04:00
Makefile KVM: Add Makefile.kvm for common files, use it for x86 2021-12-09 12:56:02 -05:00
mmu.h KVM: VMX: Include MKTME KeyID bits in shadow_zero_check 2022-05-12 09:51:45 -04:00
mtrr.c KVM: x86: Add helper to consolidate "raw" reserved GPA mask calculations 2021-02-04 09:27:30 -05:00
pmu.c S390: 2022-05-26 14:20:14 -07:00
pmu.h KVM/arm64 updates for 5.19 2022-05-25 05:09:23 -04:00
reverse_cpuid.h KVM: SEV: Mask CPUID[0x8000001F].eax according to supported features 2021-04-26 05:27:15 -04:00
trace.h KVM: SVM: Introduce trace point for the slow-path of avic_kic_target_vcpus 2022-04-29 12:50:00 -04:00
tss.h
x86.c KVM/riscv fixes for 5.19, take #1 2022-06-09 09:45:00 -04:00
x86.h ARM: 2022-03-24 11:58:57 -07:00
xen.c KVM: x86/xen: Remove the redundantly included header file lapic.h 2022-04-13 13:37:18 -04:00
xen.h KVM: x86: do not set st->preempted when going back to user space 2022-06-08 04:21:06 -04:00