KVM: TDX: Disable PI wakeup for IPIv

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Disable PI wakeup for IPI virtualization (IPIv) case for TDX.

When a vCPU is being scheduled out, notification vector is switched and
pi_wakeup_handler() is enabled when the vCPU has interrupt enabled and
posted interrupt is used to wake up the vCPU.

For VMX, a blocked vCPU can be the target of posted interrupts when using
IPIv or VT-d PI.  TDX doesn't support IPIv, disable PI wakeup for IPIv.
Also, since the guest status of TD vCPU is protected, assume interrupt is
always enabled for TD. (PV HLT hypercall is not support yet, TDX guest
tells VMM whether HLT is called with interrupt disabled or not.)

Signed-off-by: Isaku Yamahata <isaku.yamahata@intel.com>
[binbin: split into new patch]
Signed-off-by: Binbin Wu <binbin.wu@linux.intel.com>
Message-ID: <20250222014757.897978-3-binbin.wu@linux.intel.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

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This commit is contained in:

Isaku Yamahata 2025-02-22 09:47:43 +08:00 • committed by Paolo Bonzini

parent 90cfe144c8

commit 34d2d1ca1b

2 changed files with 6 additions and 2 deletions

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7

arch/x86/kvm/vmx/posted_intr.c

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1

arch/x86/kvm/vmx/tdx.c

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