From: Vitaly Kuznetsov <vkuznets@redhat.com>
To: kvm@vger.kernel.org, Paolo Bonzini <pbonzini@redhat.com>
Cc: linux-kernel@vger.kernel.org,
Sean Christopherson <seanjc@google.com>,
Wanpeng Li <wanpengli@tencent.com>,
Jim Mattson <jmattson@google.com>,
Maxim Levitsky <mlevitsk@redhat.com>
Subject: [PATCH 5/7] KVM: nVMX: Reset eVMCS clean fields data from prepare_vmcs02()
Date: Tue, 11 May 2021 13:19:54 +0200 [thread overview]
Message-ID: <20210511111956.1555830-6-vkuznets@redhat.com> (raw)
In-Reply-To: <20210511111956.1555830-1-vkuznets@redhat.com>
When nested state migration happens during L1's execution, it
is incorrect to modify eVMCS as it is L1 who 'owns' it at the moment.
At lease genuine Hyper-v seems to not be very happy when 'clean fields'
data changes underneath it.
'Clean fields' data is used in KVM twice: by copy_enlightened_to_vmcs12()
and prepare_vmcs02_rare() so we can reset it from prepare_vmcs02() instead.
Signed-off-by: Vitaly Kuznetsov <vkuznets@redhat.com>
---
arch/x86/kvm/vmx/nested.c | 9 ++++++---
1 file changed, 6 insertions(+), 3 deletions(-)
diff --git a/arch/x86/kvm/vmx/nested.c b/arch/x86/kvm/vmx/nested.c
index 3257a2291693..1661e2e19560 100644
--- a/arch/x86/kvm/vmx/nested.c
+++ b/arch/x86/kvm/vmx/nested.c
@@ -2090,9 +2090,6 @@ void nested_sync_vmcs12_to_shadow(struct kvm_vcpu *vcpu)
if (vmx->nested.hv_evmcs) {
copy_vmcs12_to_enlightened(vmx);
- /* All fields are clean */
- vmx->nested.hv_evmcs->hv_clean_fields |=
- HV_VMX_ENLIGHTENED_CLEAN_FIELD_ALL;
} else {
copy_vmcs12_to_shadow(vmx);
}
@@ -2636,6 +2633,12 @@ static int prepare_vmcs02(struct kvm_vcpu *vcpu, struct vmcs12 *vmcs12,
kvm_rsp_write(vcpu, vmcs12->guest_rsp);
kvm_rip_write(vcpu, vmcs12->guest_rip);
+
+ /* Mark all fields as clean so L1 hypervisor can set what's dirty */
+ if (hv_evmcs)
+ vmx->nested.hv_evmcs->hv_clean_fields |=
+ HV_VMX_ENLIGHTENED_CLEAN_FIELD_ALL;
+
return 0;
}
--
2.30.2
next prev parent reply other threads:[~2021-05-11 11:20 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-05-11 11:19 [PATCH 0/7] KVM: nVMX: Fixes for nested state migration when eVMCS is in use Vitaly Kuznetsov
2021-05-11 11:19 ` [PATCH 1/7] KVM: nVMX: Introduce nested_evmcs_is_used() Vitaly Kuznetsov
2021-05-11 11:19 ` [PATCH 2/7] KVM: nVMX: Release enlightened VMCS on VMCLEAR Vitaly Kuznetsov
2021-05-11 11:19 ` [PATCH 3/7] KVM: nVMX: Ignore 'hv_clean_fields' data when eVMCS data is copied in vmx_get_nested_state() Vitaly Kuznetsov
2021-05-11 16:37 ` Sean Christopherson
2021-05-12 7:14 ` Vitaly Kuznetsov
2021-05-11 11:19 ` [PATCH 4/7] KVM: nVMX: Force enlightened VMCS sync from nested_vmx_failValid() Vitaly Kuznetsov
2021-05-11 11:19 ` Vitaly Kuznetsov [this message]
2021-05-11 16:32 ` [PATCH 5/7] KVM: nVMX: Reset eVMCS clean fields data from prepare_vmcs02() Sean Christopherson
2021-05-12 7:19 ` Vitaly Kuznetsov
2021-05-11 11:19 ` [PATCH 6/7] KVM: nVMX: Request to sync eVMCS from VMCS12 after migration Vitaly Kuznetsov
2021-05-11 11:19 ` [PATCH 7/7] KVM: selftests: evmcs_test: Test that KVM_STATE_NESTED_EVMCS is never lost Vitaly Kuznetsov
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