kvm: vmx: Don't set hardware IA32_CSTAR MSR on VM-entry

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SYSCALL raises #UD in compatibility mode on Intel CPUs, so it's
pointless to load the guest's IA32_CSTAR value into the hardware MSR.

IA32_CSTAR still provides 48 bits of storage on Intel CPUs that have
CPUID.80000001:EDX.LM[bit 29] set, so we cannot remove it from the
vmx_msr_index[] array.

Signed-off-by: Jim Mattson <jmattson@google.com>
Reviewed-by: Peter Shier <pshier@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

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Jim Mattson 2018-12-05 15:29:00 -08:00 • committed by Paolo Bonzini

parent 898a811f14

commit db31c8f5af

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arch/x86/kvm/vmx/vmx.c

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