KVM: x86: do not go through ctxt->ops when emulating rsm

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Now that RSM is implemented in a single emulator callback, there is no
point in going through other callbacks for the sake of modifying
processor state.  Just invoke KVM's own internal functions directly,
and remove the callbacks that were only used by em_rsm; the only
substantial difference is in the handling of the segment registers
and descriptor cache, which have to be parsed into a struct kvm_segment
instead of a struct desc_struct.

This also fixes a bug where emulator_set_segment was shifting the
limit left by 12 if the G bit is set, but the limit had not been
shifted right upon entry to SMM.

The emulator context is still used to restore EIP and the general
purpose registers.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Reviewed-by: Maxim Levitsky <mlevitsk@redhat.com>
Message-Id: <20220929172016.319443-5-pbonzini@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

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This commit is contained in:

Paolo Bonzini 2022-09-29 13:20:12 -04:00

parent f1554150d3

commit 1d0da94cda

3 changed files with 85 additions and 143 deletions

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13

arch/x86/kvm/kvm_emulate.h

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182

arch/x86/kvm/smm.c

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33

arch/x86/kvm/x86.c

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