New: nVMX: accurately emulate VMXON region
https://bugzilla.kernel.org/show_bug.cgi?id=54521
Summary: nVMX: accurately emulate VMXON region
Product: Virtualization
Version: unspecified
Platform: All
OS/Version: Linux
Tree: Mainline
Status: NEW
Severity: enhancement
Priority: P1
Component: kvm
AssignedTo: [email protected]
ReportedBy: [email protected]
Regression: No
According to the VMX spec, the VMXON instruction takes a "VMXON region", a 4096 byte memory region which the VMX implementation (in this case, our emulation in nested VMX) may use for its needs.
We currently have no need to for this memory area, because when our implementation needs to store extra data, it stores it in the vmx_vcpu structure (in L0 memory). However, we may want to store data in guest memory in the future - e.g. for making it easier to do live migration (see bug 53851).
In any case, according to the VMX spec, the VMXON instruction is supposed to verify that the memory pointed by the VMXON operand is 4K aligned and has the right physical address width, and its content has the right VMCS revision field (copied from VMX_BASIC). We don't do this currently.
Moreover, according to the spec, VMXON needs to save this pointer, and on VMPTRLD/VMCLEAR we need to verify that the given VMCS pointer is not the VMXON region.
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[Bug 54521] nVMX: accurately emulate VMXON region
https://bugzilla.kernel.org/show_bug.cgi?id=54521
Nadav Har'El <[email protected]> changed:
What |Removed |Added
----------------------------------------------------------------------------
Blocks| |53601
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[Bug 54521] nVMX: accurately emulate VMXON region
In reply to [email protected]https://bugzilla.kernel.org/show_bug.cgi?id=54521
Bandan Das <[email protected]> changed:
What |Removed |Added
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CC| |[email protected]
--- Comment #1 from Bandan Das <[email protected]> --- Patches posted -
https://lkml.org/lkml/2014/5/6/29
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[Bug 54521] nVMX: accurately emulate VMXON region
In reply to [email protected]https://bugzilla.kernel.org/show_bug.cgi?id=54521
Paolo Bonzini <[email protected]> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |RESOLVED
CC| |[email protected]
Kernel Version| |3.16
Resolution|--- |CODE_FIXSignature · 2 lines
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[Bug 54521] nVMX: accurately emulate VMXON region
In reply to [email protected]https://bugzilla.kernel.org/show_bug.cgi?id=54521
Bandan Das <[email protected]> changed:
What |Removed |Added
----------------------------------------------------------------------------
Blocks| |94971
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