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| author | Gleb Natapov <gleb@redhat.com> | 2011-03-13 12:34:27 +0200 |
|---|---|---|
| committer | Marcelo Tosatti <mtosatti@redhat.com> | 2011-03-17 13:08:35 -0300 |
| commit | 776e58ea3d3735f85678155398241d2513afa67a (patch) | |
| tree | 7c723831868e25084707096b24a0e692abb87a5b /arch | |
| parent | 0f53b5b1c0baae4f949ac0721a55b7a2158dda01 (diff) | |
| download | linux-776e58ea3d3735f85678155398241d2513afa67a.tar.bz2 | |
KVM: unbreak userspace that does not sets tss address
Commit 6440e5967bc broke old userspaces that do not set tss address
before entering vcpu. Unbreak it by setting tss address to a safe
value on the first vcpu entry. New userspaces should set tss address,
so print warning in case it doesn't.
Signed-off-by: Gleb Natapov <gleb@redhat.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/x86/kvm/vmx.c | 13 |
1 files changed, 13 insertions, 0 deletions
diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c index d8475a26add6..5b4cdcbd154c 100644 --- a/arch/x86/kvm/vmx.c +++ b/arch/x86/kvm/vmx.c @@ -180,6 +180,7 @@ static u64 construct_eptp(unsigned long root_hpa); static void kvm_cpu_vmxon(u64 addr); static void kvm_cpu_vmxoff(void); static void vmx_set_cr3(struct kvm_vcpu *vcpu, unsigned long cr3); +static int vmx_set_tss_addr(struct kvm *kvm, unsigned int addr); static DEFINE_PER_CPU(struct vmcs *, vmxarea); static DEFINE_PER_CPU(struct vmcs *, current_vmcs); @@ -1762,6 +1763,18 @@ static void enter_rmode(struct kvm_vcpu *vcpu) vmx->emulation_required = 1; vmx->rmode.vm86_active = 1; + /* + * Very old userspace does not call KVM_SET_TSS_ADDR before entering + * vcpu. Call it here with phys address pointing 16M below 4G. + */ + if (!vcpu->kvm->arch.tss_addr) { + printk_once(KERN_WARNING "kvm: KVM_SET_TSS_ADDR need to be " + "called before entering vcpu\n"); + srcu_read_unlock(&vcpu->kvm->srcu, vcpu->srcu_idx); + vmx_set_tss_addr(vcpu->kvm, 0xfeffd000); + vcpu->srcu_idx = srcu_read_lock(&vcpu->kvm->srcu); + } + vmx->rmode.tr.selector = vmcs_read16(GUEST_TR_SELECTOR); vmx->rmode.tr.base = vmcs_readl(GUEST_TR_BASE); vmcs_writel(GUEST_TR_BASE, rmode_tss_base(vcpu->kvm)); |