KVM: Never clear KVM_REQ_VM_DEAD from a vCPU's requests

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Use kvm_test_request() instead of kvm_check_request() when querying
KVM_REQ_VM_DEAD, i.e. don't clear KVM_REQ_VM_DEAD, as the entire purpose
of KVM_REQ_VM_DEAD is to prevent the vCPU from enterring the guest ever
again, even if userspace insists on redoing KVM_RUN.

Ensuring KVM_REQ_VM_DEAD is never cleared will allow relaxing KVM's rule
that ioctls can't be invoked on dead VMs, to only disallow ioctls if the
VM is bugged, i.e. if KVM hit a KVM_BUG_ON().

Opportunistically add compile-time assertions to guard against clearing
KVM_REQ_VM_DEAD through the standard APIs.

Reviewed-by: Kai Huang <kai.huang@intel.com>
Acked-by: Marc Zyngier <maz@kernel.org>
Link: https://patch.msgid.link/20260806214618.82180-1-seanjc@google.com
Signed-off-by: Sean Christopherson <seanjc@google.com>

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This commit is contained in:

Sean Christopherson 2026-08-06 14:46:18 -07:00

parent f13368e0ac

commit 8cd280282d

5 changed files with 11 additions and 6 deletions

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2

arch/arm64/kvm/arm.c

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2

arch/x86/kvm/mmu/mmu.c

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2

arch/x86/kvm/vmx/tdx.c

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arch/x86/kvm/x86.c

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include/linux/kvm_host.h

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