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| author | Vitaly Kuznetsov <vkuznets@redhat.com> | 2018-10-11 12:03:12 +0200 |
|---|---|---|
| committer | Paolo Bonzini <pbonzini@redhat.com> | 2018-10-13 11:38:54 +0200 |
| commit | 5f8bb004bca43f7b5043c02b4aa5b9b43e15fe50 (patch) | |
| tree | 9fa36531e4f2a6980e5a82a5370247966d3eeea3 /arch | |
| parent | 4cebf459b6eb834eb28149da7ff51fadd83f2b19 (diff) | |
| download | linux-0-day-5f8bb004bca43f7b5043c02b4aa5b9b43e15fe50.tar.gz linux-0-day-5f8bb004bca43f7b5043c02b4aa5b9b43e15fe50.tar.xz | |
KVM: vmx: hyper-v: don't pass EPT configuration info to vmx_hv_remote_flush_tlb()
I'm observing random crashes in multi-vCPU L2 guests running on KVM on
Hyper-V. I bisected the issue to the commit 877ad952be3d ("KVM: vmx: Add
tlb_remote_flush callback support"). Hyper-V TLFS states:
"AddressSpace specifies an address space ID (an EPT PML4 table pointer)"
So apparently, Hyper-V doesn't expect us to pass naked EPTP, only PML4
pointer should be used. Strip off EPT configuration information before
calling into vmx_hv_remote_flush_tlb().
Fixes: 877ad952be3d ("KVM: vmx: Add tlb_remote_flush callback support")
Signed-off-by: Vitaly Kuznetsov <vkuznets@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/x86/kvm/vmx.c | 6 |
1 files changed, 5 insertions, 1 deletions
diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c index 612fd17be6351..e665aa7167cf9 100644 --- a/arch/x86/kvm/vmx.c +++ b/arch/x86/kvm/vmx.c @@ -1572,8 +1572,12 @@ static int vmx_hv_remote_flush_tlb(struct kvm *kvm) goto out; } + /* + * FLUSH_GUEST_PHYSICAL_ADDRESS_SPACE hypercall needs the address of the + * base of EPT PML4 table, strip off EPT configuration information. + */ ret = hyperv_flush_guest_mapping( - to_vmx(kvm_get_vcpu(kvm, 0))->ept_pointer); + to_vmx(kvm_get_vcpu(kvm, 0))->ept_pointer & PAGE_MASK); out: spin_unlock(&to_kvm_vmx(kvm)->ept_pointer_lock); |