KVM: x86: Reduce the number of emulator GPRs to '8' for 32-bit KVM

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Reduce the number of GPRs emulated by 32-bit KVM from 16 to 8.  KVM does
not support emulating 64-bit mode on 32-bit host kernels, and so should
never generate accesses to R8-15.

Opportunistically use NR_EMULATOR_GPRS in rsm_load_state_{32,64}() now
that it is precise and accurate for both flavors.

Wrap the definition with full #ifdef ugliness; sadly, IS_ENABLED()
doesn't guarantee a compile-time constant as far as BUILD_BUG_ON() is
concerned.

Signed-off-by: Sean Christopherson <seanjc@google.com>
Reviewed-by: Kees Cook <keescook@chromium.org>
Message-Id: <20220526210817.3428868-6-seanjc@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

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This commit is contained in:

Sean Christopherson 2022-05-26 21:08:14 +00:00 • committed by Paolo Bonzini

parent 0cbc60d44c

commit b443183a25

2 changed files with 6 additions and 5 deletions

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4

arch/x86/kvm/emulate.c

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7

arch/x86/kvm/kvm_emulate.h

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