From: Vitaly Kuznetsov <vkuznets@redhat.com>
To: kvm@vger.kernel.org
Cc: "Paolo Bonzini" <pbonzini@redhat.com>,
"Radim Krčmář" <rkrcmar@redhat.com>,
"K. Y. Srinivasan" <kys@microsoft.com>,
"Haiyang Zhang" <haiyangz@microsoft.com>,
"Stephen Hemminger" <sthemmin@microsoft.com>,
"Michael Kelley (EOSG)" <Michael.H.Kelley@microsoft.com>,
"Tianyu Lan" <Tianyu.Lan@microsoft.com>,
linux-kernel@vger.kernel.org
Subject: [PATCH] KVM: vmx: hyper-v: don't pass EPT configuration info to vmx_hv_remote_flush_tlb()
Date: Thu, 11 Oct 2018 12:03:12 +0200 [thread overview]
Message-ID: <20181011100312.4083-1-vkuznets@redhat.com> (raw)
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>
---
arch/x86/kvm/vmx.c | 6 +++++-
1 file changed, 5 insertions(+), 1 deletion(-)
diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c
index 612fd17be635..e665aa7167cf 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);
--
2.17.1
next reply other threads:[~2018-10-11 10:03 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-10-11 10:03 Vitaly Kuznetsov [this message]
2018-10-11 12:07 ` [PATCH] KVM: vmx: hyper-v: don't pass EPT configuration info to vmx_hv_remote_flush_tlb() Tianyu Lan
2018-10-11 12:18 ` Vitaly Kuznetsov
2018-10-11 12:41 ` Tianyu Lan
2018-10-11 13:00 ` Vitaly Kuznetsov
2018-10-11 13:12 ` Tianyu Lan
2018-10-13 9:39 ` Paolo Bonzini
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