Commit f7eaeb0a authored Mar 05, 2018 by Sean Christopherson Committed by Paolo Bonzini Mar 16, 2018

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



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>

parent 915e6f78

arch/x86/kvm/vmx.c

+3 −0

Original line number	Original line	Diff line number	Diff line
	@@ -6044,6 +6044,9 @@ static int vmx_set_tss_addr(struct kvm *kvm, unsigned int addr)
	{		{
	int ret;		int ret;

			if (enable_unrestricted_guest)
			return 0;

	ret = x86_set_memory_region(kvm, TSS_PRIVATE_MEMSLOT, addr,		ret = x86_set_memory_region(kvm, TSS_PRIVATE_MEMSLOT, addr,
	PAGE_SIZE * 3);		PAGE_SIZE * 3);
	if (ret)		if (ret)

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