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Sean Christopherson 023816bd5f KVM: x86: Reset IRTE to host control if *new* route isn't postable

commit 9bcac97dc4 upstream.

Restore an IRTE back to host control (remapped or posted MSI mode) if the
*new* GSI route prevents posting the IRQ directly to a vCPU, regardless of
the GSI routing type.  Updating the IRTE if and only if the new GSI is an
MSI results in KVM leaving an IRTE posting to a vCPU.

The dangling IRTE can result in interrupts being incorrectly delivered to
the guest, and in the worst case scenario can result in use-after-free,
e.g. if the VM is torn down, but the underlying host IRQ isn't freed.

Fixes: efc644048e ("KVM: x86: Update IRTE for posted-interrupts")
Fixes: 411b44ba80 ("svm: Implements update_pi_irte hook to setup posted interrupt")
Cc: stable@vger.kernel.org
Signed-off-by: Sean Christopherson <seanjc@google.com>
Message-ID: <20250404193923.1413163-3-seanjc@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

2025-05-02 07:46:57 +02:00

alpha

alpha/elf: Fix misc/setarch test of util-linux by removing 32bit support

2025-03-28 21:58:51 +01:00

arc

ARC: build: Try to guess GCC variant of cross compiler

2025-01-09 13:30:05 +01:00

arm

ARM: dts: imx6qdl-apalis: Fix poweroff on Apalis iMX6

2025-04-07 10:05:46 +02:00

arm64

KVM: arm64: Eagerly switch ZCR_EL{1,2}