KVM: nVMX: Allow the caller to provide instruction length on nested VM-Exit

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Rework the nested VM-Exit helper to take the instruction length as a
parameter, and convert nested_vmx_vmexit() into a "default" wrapper that
grabs the length from vmcs02 as appropriate.  This will allow KVM to set
the correct instruction length when synthesizing a nested VM-Exit when
emulating an instruction that L1 wants to intercept.

No functional change intended, as the path to prepare_vmcs12()'s reading
of vmcs02.VM_EXIT_INSTRUCTION_LEN is gated on the same set of conditions
as the VMREAD in the new nested_vmx_vmexit().

Link: https://lore.kernel.org/r/20250201015518.689704-10-seanjc@google.com
Signed-off-by: Sean Christopherson <seanjc@google.com>

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This commit is contained in:

Sean Christopherson 2025-01-31 17:55:16 -08:00

parent d4aea23fd0

commit fbd1e0f195

2 changed files with 27 additions and 7 deletions

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12

arch/x86/kvm/vmx/nested.c

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22

arch/x86/kvm/vmx/nested.h

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