From: Alexander Graf <graf@amazon.com>
To: <kvm@vger.kernel.org>
Cc: linux-kernel@vger.kernel.org, x86@kernel.org,
"H. Peter Anvin" <hpa@zytor.com>,
"Borislav Petkov" <bp@alien8.de>,
"Ingo Molnar" <mingo@redhat.com>,
"Thomas Gleixner" <tglx@linutronix.de>,
"Joerg Roedel" <joro@8bytes.org>,
"Jim Mattson" <jmattson@google.com>,
"Wanpeng Li" <wanpengli@tencent.com>,
"Vitaly Kuznetsov" <vkuznets@redhat.com>,
"Sean Christopherson" <sean.j.christopherson@intel.com>,
"Radim Krčmář" <rkrcmar@redhat.com>,
"Paolo Bonzini" <pbonzini@redhat.com>
Subject: [PATCH 0/2] KVM: Only use posted interrupts for Fixes/LowPrio MSIs
Date: Tue, 3 Sep 2019 16:29:52 +0200 [thread overview]
Message-ID: <20190903142954.3429-1-graf@amazon.com> (raw)
The MSI-X descriptor has a "delivery mode" field which can be set to
various different targets, such as "Fixed" (default), SMI, NMI or INIT.
Usually when we pass devices into guests, we only ever see this MSI-X
descriptor configured as Fixed, so nobody realized that the other modes
were broken when using posted interrupts.
With posted interrupts, we end up configuring these special modes just
the same as a Fixed interrupt. That means instead of generating an SMI,
we inject a normal GSI into the guest.
Of course, that if completely broken. These two patches attempt to fix
the situation for x86 systems. If anyone has a great idea how to generalize
the filtering though, I'm all ears.
Alex
Alexander Graf (2):
KVM: VMX: Disable posted interrupts for odd IRQs
KVM: SVM: Disable posted interrupts for odd IRQs
arch/x86/kvm/svm.c | 16 ++++++++++++++++
arch/x86/kvm/vmx/vmx.c | 22 ++++++++++++++++++++++
2 files changed, 38 insertions(+)
--
2.17.1
Amazon Development Center Germany GmbH
Krausenstr. 38
10117 Berlin
Geschaeftsfuehrung: Christian Schlaeger, Ralf Herbrich
Eingetragen am Amtsgericht Charlottenburg unter HRB 149173 B
Sitz: Berlin
Ust-ID: DE 289 237 879
next reply other threads:[~2019-09-03 14:30 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-09-03 14:29 Alexander Graf [this message]
2019-09-03 14:29 ` [PATCH 1/2] KVM: VMX: Disable posted interrupts for odd IRQs Alexander Graf
2019-09-03 23:15 ` Liran Alon
2019-09-03 14:29 ` [PATCH 2/2] KVM: SVM: " Alexander Graf
2019-09-03 23:20 ` Liran Alon
2019-09-04 13:06 ` Alexander Graf
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