KVM: x86: Assert that the emulator doesn't load CS with garbage in !RM

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Yell loudly if KVM attempts to load CS outside of Real Mode without an
accompanying control transfer type, i.e. on X86_TRANSFER_NONE.  KVM uses
X86_TRANSFER_NONE when emulating IRET and exceptions/interrupts for Real
Mode, but IRET emulation for Protected Mode is non-existent.  WARN instead
of trying to pass in a less-wrong type, e.g. X86_TRANSFER_RET, as
emulating IRET goes even beyond emulating FAR RET (which KVM also doesn't
fully support).

Reported-by: Hou Wenlong <houwenlong.hwl@antgroup.com>
Link: https://lore.kernel.org/r/20230216202254.671772-1-seanjc@google.com
Signed-off-by: Sean Christopherson <seanjc@google.com>

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Sean Christopherson 2023-02-16 12:22:54 -08:00

parent 3d8f61bf8b

commit 65966aaca1

1 changed files with 8 additions and 0 deletions

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arch/x86/kvm/emulate.c

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