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linux/arch/x86/kvm
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Sean Christopherson d07898eaf3 KVM: x86: Don't WARN if userspace mucks with RCX during string I/O exit 
Replace a WARN with a comment to call out that userspace can modify RCX
during an exit to userspace to handle string I/O.  KVM doesn't actually
support changing the rep count during an exit, i.e. the scenario can be
ignored, but the WARN needs to go as it's trivial to trigger from
userspace.

Cc: stable@vger.kernel.org
Fixes: 3b27de2718 ("KVM: x86: split the two parts of emulator_pio_in")
Signed-off-by: Sean Christopherson <seanjc@google.com>
Message-Id: <20211025201311.1881846-2-seanjc@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2021-12-10 09:38:02 -05:00
..
mmu KVM: x86/mmu: Retry page fault if root is invalidated by memslot update 2021-12-02 04:12:12 -05:00
svm KVM: SVM: Do not terminate SEV-ES guests on GHCB validation failure 2021-12-05 03:02:04 -05:00
vmx KVM: nVMX: Don't use Enlightened MSR Bitmap for L3 2021-12-08 04:53:13 -05:00
cpuid.c cpuid: kvm_find_kvm_cpuid_features() should be declared 'static' 2021-11-18 02:03:14 -05:00
cpuid.h KVM: x86: Move reverse CPUID helpers to separate header file 2021-04-26 05:27:13 -04:00
debugfs.c KVM: X86: Introduce mmu_rmaps_stat per-vm debugfs file 2021-08-20 16:06:11 -04:00
emulate.c KVM/arm64 updates for Linux 5.16 2021-10-31 02:28:48 -04:00
fpu.h KVM: x86: Move FPU register accessors into fpu.h 2021-06-17 13:09:24 -04:00
hyperv.c KVM: x86: Ignore sparse banks size for an "all CPUs", non-sparse IPI req 2021-12-10 07:12:42 -05:00
hyperv.h KVM: x86: Query vcpu->vcpu_idx directly and drop its accessor 2021-09-22 10:33:11 -04:00
i8254.c KVM: x86: Migrate the PIT only if vcpu0 is migrated, not any BSP 2021-08-02 11:01:51 -04:00
i8254.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
i8259.c x86: Fix typo s/ECLR/ELCR/ for the PIC register 2021-08-10 23:31:44 +02:00
ioapic.c kvm: rename KVM_MAX_VCPU_ID to KVM_MAX_VCPU_IDS 2021-09-30 04:27:05 -04:00
ioapic.h x86/kvm: remove unused ack_notifier callbacks 2021-11-18 07:05:57 -05:00
irq.c KVM: x86/xen: Add event channel interrupt vector upcall 2021-02-04 14:19:39 +00:00
irq.h x86/kvm: remove unused ack_notifier callbacks 2021-11-18 07:05:57 -05:00
irq_comm.c x86: Fix various typos in comments 2021-03-18 15:31:53 +01:00
Kconfig KVM: x86: add config for non-kvm users of page tracking 2021-10-01 03:44:57 -04:00
kvm_cache_regs.h KVM: x86: Introduce KVM_GET_SREGS2 / KVM_SET_SREGS2 2021-06-17 13:09:47 -04:00
kvm_emulate.h KVM: x86: Drop "pre_" from enter/leave_smm() helpers 2021-06-17 13:09:35 -04:00
kvm_onhyperv.c KVM: x86: hyper-v: Move the remote TLB flush logic out of vmx 2021-06-17 13:09:36 -04:00
kvm_onhyperv.h KVM: x86: hyper-v: Move the remote TLB flush logic out of vmx 2021-06-17 13:09:36 -04:00
lapic.c KVM: x86: check PIR even for vCPUs with disabled APICv 2021-11-30 03:52:39 -05:00
lapic.h KVM: x86: Rename kvm_lapic_enable_pv_eoi() 2021-11-11 10:56:22 -05:00
Makefile KVM: stats: Add fd-based API to read binary stats data 2021-06-24 11:47:57 -04:00
mmu.h KVM: X86: Don't unload MMU in kvm_vcpu_flush_tlb_guest() 2021-10-22 05:44:43 -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 kvm: x86: Convert return type of *is_valid_rdpmc_ecx() to bool 2021-11-11 10:56:19 -05:00
pmu.h kvm: x86: Convert return type of *is_valid_rdpmc_ecx() to bool 2021-11-11 10:56:19 -05:00
reverse_cpuid.h KVM: SEV: Mask CPUID[0x8000001F].eax according to supported features 2021-04-26 05:27:15 -04:00
trace.h KVM: x86: Get exit_reason as part of kvm_x86_ops.get_exit_info 2021-10-25 06:48:24 -04:00
tss.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
x86.c KVM: x86: Don't WARN if userspace mucks with RCX during string I/O exit 2021-12-10 09:38:02 -05:00
x86.h KVM: nVMX: Abide to KVM_REQ_TLB_FLUSH_GUEST request on nested vmentry/vmexit 2021-11-26 07:07:49 -05:00
xen.c KVM: x86: Assume a 64-bit hypercall for guests with protected state 2021-11-18 02:12:13 -05:00
xen.h KVM: xen: do not use struct gfn_to_hva_cache 2021-08-05 03:31:40 -04:00