From: Sean Christopherson Date: Mon, 5 Mar 2018 20:04:36 +0000 (-0800) Subject: KVM: VMX: don't configure RM TSS for unrestricted guest X-Git-Url: http://git.lede-project.org./?a=commitdiff_plain;h=f7eaeb0ad815730dc63e8974e6f9f4d93b8ca8bb;p=openwrt%2Fstaging%2Fblogic.git 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 Signed-off-by: Radim Krčmář --- diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c index 5726cee43f4f..a5d2c6977e3c 100644 --- a/arch/x86/kvm/vmx.c +++ b/arch/x86/kvm/vmx.c @@ -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)