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From: Sean Christopherson <seanjc@google.com>
To: "Chang S. Bae" <chang.seok.bae@intel.com>
Cc: pbonzini@redhat.com, kvm@vger.kernel.org,
	linux-kernel@vger.kernel.org,  chao.gao@intel.com
Subject: Re: [PATCH v2 16/16] KVM: x86: selftests: Add APX state handling and XCR0 sanity checks
Date: Wed, 4 Mar 2026 20:28:06 -0800	[thread overview]
Message-ID: <aakGVnGI4jZ8yCUM@google.com> (raw)
In-Reply-To: <20260112235408.168200-17-chang.seok.bae@intel.com>

On Mon, Jan 12, 2026, Chang S. Bae wrote:
> Now that KVM exposes the APX feature to guests on APX-capable systems,
> extend the selftests to validate XCR0 configuration and state management.
> 
> Since APX repurposes the XSAVE area previously used by MPX in the
> non-compacted format, add a check to ensure that MPX states are not set
> when APX is enabled.
> 
> Also, load non-init APX state data in the guest so that XSTATE_BV[APX] is
> set, allowing validation of APX state testing.

I assume/hope there a more tests coming in future versions...

KVM-Unit-Tests' x86/xsave.c would be a good fit, or at least a good reference
for what we should be testing as far as EGPR accesses are concerned.

  reply	other threads:[~2026-03-05  4:28 UTC|newest]

Thread overview: 40+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2026-01-12 23:53 [PATCH v2 00/16] KVM: x86: Enable APX for guests Chang S. Bae
2026-01-12 23:53 ` [PATCH v2 01/16] KVM: x86: Rename register accessors to be GPR-specific Chang S. Bae
2026-03-05  1:35   ` Sean Christopherson
2026-03-07  1:32     ` Chang S. Bae
2026-03-09 23:28       ` Chang S. Bae
2026-03-10  1:23       ` Sean Christopherson
2026-03-10 22:05         ` Chang S. Bae
2026-03-10 23:12           ` Sean Christopherson
2026-01-12 23:53 ` [PATCH v2 02/16] KVM: x86: Refactor GPR accessors to differentiate register access types Chang S. Bae
2026-03-05  1:49   ` Sean Christopherson
2026-03-07  1:32     ` Chang S. Bae
2026-01-12 23:53 ` [PATCH v2 03/16] KVM: x86: Implement accessors for extended GPRs Chang S. Bae
2026-03-05  1:41   ` Sean Christopherson
2026-03-07  1:32     ` Chang S. Bae
2026-01-12 23:53 ` [PATCH v2 04/16] KVM: VMX: Introduce unified instruction info structure Chang S. Bae
2026-03-05  4:21   ` Sean Christopherson
2026-03-07  1:33     ` Chang S. Bae
2026-03-13  1:05       ` Sean Christopherson
2026-01-12 23:53 ` [PATCH v2 05/16] KVM: VMX: Refactor instruction information retrieval Chang S. Bae
2026-01-12 23:53 ` [PATCH v2 06/16] KVM: VMX: Refactor GPR index retrieval from exit qualification Chang S. Bae
2026-03-05  4:13   ` Sean Christopherson
2026-01-12 23:53 ` [PATCH v2 07/16] KVM: VMX: Support extended register index in exit handling Chang S. Bae
2026-01-12 23:54 ` [PATCH v2 08/16] KVM: nVMX: Propagate the extended instruction info field Chang S. Bae
2026-01-12 23:54 ` [PATCH v2 09/16] KVM: emulate: Support EGPR accessing and tracking Chang S. Bae
2026-03-05  4:22   ` Sean Christopherson
2026-01-12 23:54 ` [PATCH v2 10/16] KVM: emulate: Handle EGPR index and REX2-incompatible opcodes Chang S. Bae
2026-01-12 23:54 ` [PATCH v2 11/16] KVM: emulate: Support REX2-prefixed opcode decode Chang S. Bae
2026-01-12 23:54 ` [PATCH v2 12/16] KVM: emulate: Reject EVEX-prefixed instructions Chang S. Bae
2026-01-12 23:54 ` [PATCH v2 13/16] KVM: x86: Guard valid XCR0.APX settings Chang S. Bae
2026-01-12 23:54 ` [PATCH v2 14/16] KVM: x86: Expose APX foundational feature bit to guests Chang S. Bae
2026-01-19  5:55   ` Xiaoyao Li
2026-01-20 18:07     ` Edgecombe, Rick P
2026-01-20 20:50       ` Chang S. Bae
2026-01-21 19:59         ` Edgecombe, Rick P
2026-01-12 23:54 ` [PATCH v2 15/16] KVM: x86: Expose APX sub-features " Chang S. Bae
2026-01-12 23:54 ` [PATCH v2 16/16] KVM: x86: selftests: Add APX state handling and XCR0 sanity checks Chang S. Bae
2026-03-05  4:28   ` Sean Christopherson [this message]
2026-03-07  1:33     ` Chang S. Bae
2026-03-11 18:42       ` Paolo Bonzini
2026-04-20 21:23         ` [PATCH kvm-unit-tests] x86: xsave: Add test case for emulation of APX instructions Chang S. Bae

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