linux-kernel - Re: [PATCH v2 0/4] KVM: selftests: Test SET_NESTED

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Message-ID: <176375118181.288827.8430542805047208308.b4-ty@google.com>
Date: Fri, 21 Nov 2025 10:55:37 -0800
From: Sean Christopherson <seanjc@...gle.com>
To: Sean Christopherson <seanjc@...gle.com>, Paolo Bonzini <pbonzini@...hat.com>, 
	Shuah Khan <shuah@...nel.org>, Marc Zyngier <maz@...nel.org>, Oliver Upton <oliver.upton@...ux.dev>, 
	Joey Gouly <joey.gouly@....com>, Suzuki K Poulose <suzuki.poulose@....com>, 
	Zenghui Yu <yuzenghui@...wei.com>, Andrew Jones <ajones@...tanamicro.com>, 
	Huacai Chen <chenhuacai@...nel.org>, Bibo Mao <maobibo@...ngson.cn>, 
	"Pratik R. Sampat" <prsampat@....com>, James Houghton <jthoughton@...gle.com>, linux-kernel@...r.kernel.org, 
	kvm@...r.kernel.org, linux-kselftest@...r.kernel.org, 
	linux-arm-kernel@...ts.infradead.org, kvmarm@...ts.linux.dev, 
	Jim Mattson <jmattson@...gle.com>
Subject: Re: [PATCH v2 0/4] KVM: selftests: Test SET_NESTED_STATE with 48-bit
 L2 on 57-bit L1

On Tue, 28 Oct 2025 15:30:38 -0700, Jim Mattson wrote:
> Prior to commit 9245fd6b8531 ("KVM: x86: model canonical checks more
> precisely"), KVM_SET_NESTED_STATE would fail if the state was captured
> with L2 active, L1 had CR4.LA57 set, L2 did not, and the
> VMCS12.HOST_GSBASE (or other host-state field checked for canonicality)
> had an address greater than 48 bits wide.
> 
> Add a regression test that reproduces the KVM_SET_NESTED_STATE failure
> conditions. To do so, the first three patches add support for 5-level
> paging in the selftest L1 VM.
> 
> [...]

Applied to kvm-x86 selftests, thanks!

[1/4] KVM: selftests: Use a loop to create guest page tables
      https://github.com/kvm-x86/linux/commit/ae5b498b8da9
[2/4] KVM: selftests: Use a loop to walk guest page tables
      https://github.com/kvm-x86/linux/commit/2103a8baf5cb
[3/4] KVM: selftests: Change VM_MODE_PXXV48_4K to VM_MODE_PXXVYY_4K
      https://github.com/kvm-x86/linux/commit/ec5806639e39
[4/4] KVM: selftests: Add a VMX test for LA57 nested state
      https://github.com/kvm-x86/linux/commit/6a8818de21d2

--
https://github.com/kvm-x86/linux/tree/next