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77e1b8332d
Use a dedicated counter to track the number of IRQs that can utilize IRQ
bypass instead of piggybacking the assigned device count. As evidenced by
commit 2edd9cb79f ("kvm: detect assigned device via irqbypass manager"),
it's possible for a device to be able to post IRQs to a vCPU without said
device being assigned to a VM.
Leave the calls to kvm_arch_{start,end}_assignment() alone for the moment
to avoid regressing the MMIO stale data mitigation. KVM is abusing the
assigned device count when applying mmio_stale_data_clear, and it's not at
all clear if vDPA devices rely on this behavior. This will hopefully be
cleaned up in the future, as the number of assigned devices is a terrible
heuristic for detecting if a VM has access to host MMIO.
Link: https://lore.kernel.org/r/20250611224604.313496-55-seanjc@google.com
Signed-off-by: Sean Christopherson <seanjc@google.com>
30 lines
902 B
C
30 lines
902 B
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef __KVM_X86_VMX_POSTED_INTR_H
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#define __KVM_X86_VMX_POSTED_INTR_H
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#include <linux/bitmap.h>
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#include <linux/find.h>
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#include <linux/kvm_host.h>
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#include <asm/posted_intr.h>
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void vmx_vcpu_pi_load(struct kvm_vcpu *vcpu, int cpu);
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void vmx_vcpu_pi_put(struct kvm_vcpu *vcpu);
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void pi_wakeup_handler(void);
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void __init pi_init_cpu(int cpu);
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void pi_apicv_pre_state_restore(struct kvm_vcpu *vcpu);
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bool pi_has_pending_interrupt(struct kvm_vcpu *vcpu);
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int vmx_pi_update_irte(struct kvm_kernel_irqfd *irqfd, struct kvm *kvm,
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unsigned int host_irq, uint32_t guest_irq,
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struct kvm_vcpu *vcpu, u32 vector);
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void vmx_pi_start_bypass(struct kvm *kvm);
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static inline int pi_find_highest_vector(struct pi_desc *pi_desc)
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{
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int vec;
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vec = find_last_bit(pi_desc->pir, 256);
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return vec < 256 ? vec : -1;
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}
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#endif /* __KVM_X86_VMX_POSTED_INTR_H */
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