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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>
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
Download Patch File Download Diff File Expand all files Collapse all files

7
arch/x86/kvm/vmx/posted_intr.c
View File

@@ -11,6 +11,7 @@
#include "posted_intr.h"
#include "trace.h"
#include "vmx.h"
#include "tdx.h"
/*
* Maintain a per-CPU list of vCPUs that need to be awakened by wakeup_handler()
@@ -190,7 +191,8 @@ static bool vmx_needs_pi_wakeup(struct kvm_vcpu *vcpu)
* notification vector is switched to the one that calls
* back to the pi_wakeup_handler() function.
*/
return vmx_can_use_ipiv(vcpu) || vmx_can_use_vtd_pi(vcpu->kvm);
return (vmx_can_use_ipiv(vcpu) && !is_td_vcpu(vcpu)) ||
vmx_can_use_vtd_pi(vcpu->kvm);
}
void vmx_vcpu_pi_put(struct kvm_vcpu *vcpu)
@@ -200,7 +202,8 @@ void vmx_vcpu_pi_put(struct kvm_vcpu *vcpu)
if (!vmx_needs_pi_wakeup(vcpu))
return;
if (kvm_vcpu_is_blocking(vcpu) && !vmx_interrupt_blocked(vcpu))
if (kvm_vcpu_is_blocking(vcpu) &&
(is_td_vcpu(vcpu) || !vmx_interrupt_blocked(vcpu)))
pi_enable_wakeup_handler(vcpu);
/*

1
arch/x86/kvm/vmx/tdx.c
View File

@@ -650,6 +650,7 @@ int tdx_vcpu_create(struct kvm_vcpu *vcpu)
fpstate_set_confidential(&vcpu->arch.guest_fpu);
vcpu->arch.apic->guest_apic_protected = true;
INIT_LIST_HEAD(&tdx->vt.pi_wakeup_list);
vcpu->arch.efer = EFER_SCE | EFER_LME | EFER_LMA | EFER_NX;