]> git.proxmox.com Git - mirror_ubuntu-kernels.git/commit
KVM: VMX: Do not allow reexecute_instruction() when skipping MMIO instr
authorSean Christopherson <sean.j.christopherson@intel.com>
Thu, 23 Aug 2018 20:56:46 +0000 (13:56 -0700)
committerRadim Krčmář <rkrcmar@redhat.com>
Thu, 30 Aug 2018 14:20:42 +0000 (16:20 +0200)
commitc4409905cd6eb42cfd06126e9226b0150e05a715
treed3677915aa1cad29cb819632547047d0847ac319
parent0186ec823280f5db55ab2e6291933bebe2e92772
KVM: VMX: Do not allow reexecute_instruction() when skipping MMIO instr

Re-execution after an emulation decode failure is only intended to
handle a case where two or vCPUs race to write a shadowed page, i.e.
we should never re-execute an instruction as part of MMIO emulation.
As handle_ept_misconfig() is only used for MMIO emulation, it should
pass EMULTYPE_NO_REEXECUTE when using the emulator to skip an instr
in the fast-MMIO case where VM_EXIT_INSTRUCTION_LEN is invalid.

And because the cr2 value passed to x86_emulate_instruction() is only
destined for use when retrying or reexecuting, we can simply call
emulate_instruction().

Fixes: d391f1207067 ("x86/kvm/vmx: do not use vm-exit instruction length
                      for fast MMIO when running nested")
Cc: Vitaly Kuznetsov <vkuznets@redhat.com>
Signed-off-by: Sean Christopherson <sean.j.christopherson@intel.com>
Cc: stable@vger.kernel.org
Signed-off-by: Radim Krčmář <rkrcmar@redhat.com>
arch/x86/kvm/vmx.c