[1/6] KVM: VMX: don't configure RM TSS for unrestricted guest
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Message ID 20180305200441.5089-2-sean.j.christopherson@intel.com
State New
Headers show

Commit Message

Sean Christopherson March 5, 2018, 8:04 p.m. UTC
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>
---
 arch/x86/kvm/vmx.c | 3 +++
 1 file changed, 3 insertions(+)

Patch
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diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c
index 591214843046..b794b0f44cd3 100644
--- a/arch/x86/kvm/vmx.c
+++ b/arch/x86/kvm/vmx.c
@@ -6017,6 +6017,9 @@  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)