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KVM: VMX: don't configure RM TSS for unrestricted guest

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An unrestricted guest can run with CR0.PG==0 and/or CR0.PE==0,
e.g. it can run in Real Mode without requiring host emulation.
The RM TSS is only used for emulating RM, i.e. it will never
be used when unrestricted guest is enabled and so doesn't need
to be configured.

Signed-off-by: Sean Christopherson <sean.j.christopherson@intel.com>
Signed-off-by: Radim Krčmář <rkrcmar@redhat.com>
This commit is contained in:
Sean Christopherson 2018-03-05 12:04:36 -08:00 committed by Paolo Bonzini
parent 915e6f78bd
commit f7eaeb0ad8
1 changed files with 3 additions and 0 deletions
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3
arch/x86/kvm/vmx.c
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@ -6044,6 +6044,9 @@ static int vmx_set_tss_addr(struct kvm *kvm, unsigned int addr)
{
int ret;
if (enable_unrestricted_guest)
return 0;
ret = x86_set_memory_region(kvm, TSS_PRIVATE_MEMSLOT, addr,
PAGE_SIZE * 3);
if (ret)