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2976313883
If an APICv status updated was pended while L2 was active, immediately
refresh vmcs01's controls instead of pending KVM_REQ_APICV_UPDATE as
kvm_vcpu_update_apicv() only calls into vendor code if a change is
necessary.
E.g. if APICv is inhibited, and then activated while L2 is running:
kvm_vcpu_update_apicv()
|
-> __kvm_vcpu_update_apicv()
|
-> apic->apicv_active = true
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-> vmx_refresh_apicv_exec_ctrl()
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-> vmx->nested.update_vmcs01_apicv_status = true
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-> return
Then L2 exits to L1:
__nested_vmx_vmexit()
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-> kvm_make_request(KVM_REQ_APICV_UPDATE)
vcpu_enter_guest(): KVM_REQ_APICV_UPDATE
-> kvm_vcpu_update_apicv()
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-> __kvm_vcpu_update_apicv()
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-> return // because if (apic->apicv_active == activate)
Reported-by: Chao Gao <chao.gao@intel.com>
Closes: https://lore.kernel.org/all/aQ2jmnN8wUYVEawF@intel.com
Fixes:
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History
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Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the reStructuredText markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.