KVM: x86: Drop superfluous caching of KVM_ASYNC_PF_DELIVERY_AS_PF_VMEXIT

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Drop kvm_vcpu_arch.apf.delivery_as_pf_vmexit and instead use msr_en_val as
the source of truth to reduce the probability of operating on stale data.
This fixes flaws where KVM fails to update delivery_as_pf_vmexit when APF
is explicitly disabled by the guest or implicitly disabled by KVM on INIT.
Absent other bugs, the flaws are benign as KVM *shouldn't* consume
delivery_as_pf_vmexit when PV APF support is disabled.

Simply delete the field, as there's zero benefit to maintaining a separate
"cache" of the state.

Fixes: 52a5c155cf ("KVM: async_pf: Let guest support delivery of async_pf from guest mode")
Reviewed-by: Binbin Wu <binbin.wu@linux.intel.com>
Reviewed-by: Xiaoyao Li <xiaoyao.li@intel.com>
Link: https://patch.msgid.link/20260406225359.1245490-3-seanjc@google.com
Signed-off-by: Sean Christopherson <seanjc@google.com>

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This commit is contained in:

Sean Christopherson 2026-04-06 15:53:57 -07:00

parent 923ca078f0

commit 3c0bf11dd4

2 changed files with 1 additions and 3 deletions

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arch/x86/include/asm/kvm_host.h

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arch/x86/kvm/x86.c

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