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Re: [PATCH v3] x86/nestedhvm: process the MSR-load and MSR-store areas of L1's VMCS
- To: Mahmoud Abumandour <ma.mandourr@xxxxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Thu, 12 Nov 2026 10:55:54 +0100
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- Cc: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, Roger Pau Monné <roger@xxxxxxxxxxxxxx>, Teddy Astie <teddy.astie@xxxxxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxxx
- Delivery-date: Thu, 12 Nov 2026 09:56:03 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 12.11.2026 05:52, Mahmoud Abumandour wrote:
> Nothing in vvmx.c reads the VM-entry MSR-load, VM-exit MSR-store or VM-exit
> MSR-load area of L1's VMCS, so L2 runs with the listed MSRs as the previous
> L2 or L1 left them, and L1 gets neither L2's values stored nor its own
> loaded back. Process each area where the SDM does, with the SDM's checks,
> an entry as a WRMSR or RDMSR at CPL 0 that L1 does not intercept. A bad
> VM-entry entry fails the VM entry with exit reason 34 and leaves the VMCS
> unlaunched, a bad VM-exit entry is a VMX abort, which crashes the domain,
> and IA32_VMX_MISC now recommends the 512 entries an area may hold.
>
> Fixes: 9390642b7fa5 ("Nested VMX: Switch shadow/virtual VMCS between n1/n2
> guests.")
> Assisted-by: Claude:claude-opus-5-5
> Signed-off-by: Mahmoud Abumandour <ma.mandourr@xxxxxxxxx>
Reviewed-by: Jan Beulich <jbeulich@xxxxxxxx>
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