On 2016/7/16 21:10, Radim Krčmář wrote:
2016-07-15 18:28+0000, Cao, Lei:
With PML enabled, guest will shut down if a PML full VMEXIT occurs during
event delivery. According to Intel SDM 27.2.3, PML full VMEXIT can occur when
event is being delivered through IDT, so KVM should not exit to user space
with error. Instead, it should let EXIT_REASON_PML_FULL go through and the
event will be re-injected on the next VMENTRY.
Signed-off-by: Lei Cao <lei.cao@xxxxxxxxxxx>
---
Applied, thanks.
I have Cc'd stable and shortened the summary to "KVM: VMX: handle PML
full VMEXIT that occurs during event delivery".
(See Documentation/SubmittingPatches for reasoning about the 70-75
character limit.)
According to intel SDM 27.2.3, APIC-access VM exit also is possible
during event delivery, but i don't see KVM considers it in
vmx_handle_exit(). Am i missing something?
27.2.3 Information for VM Exits During Event Delivery
Section 24.9.3 defined fields containing information for VM exits that
occur while delivering an event through the IDT and as a result of any
of the following cases:
• A fault occurs during event delivery and causes a VM exit (because the
bit associated with the fault is set to 1 in the exception bitmap).
• A task switch is invoked through a task gate in the IDT. The VM exit
occurs due to the task switch only after the initial checks of the task
switch pass (see Section 25.4.2).
• Event delivery causes an APIC-access VM exit (see Section 29.4).
• An EPT violation, EPT misconfiguration, or page-modification log-full
event that occurs during event delivery.
--
Yang
Alibaba Cloud Computing
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