From: "Chang S. Bae" <chang.seok.bae@intel.com>
To: Paolo Bonzini <pbonzini@redhat.com>,
Sean Christopherson <seanjc@google.com>
Cc: Kiryl Shutsemau <kas@kernel.org>, <kvm@vger.kernel.org>,
<x86@kernel.org>, <linux-coco@lists.linux.dev>,
<linux-kernel@vger.kernel.org>
Subject: Re: [PATCH 0/7] KVM: x86: APX reg prep work
Date: Fri, 3 Apr 2026 15:05:10 -0700 [thread overview]
Message-ID: <aea176c8-35de-4042-bf98-e42ce05f93fb@intel.com> (raw)
In-Reply-To: <88e9d7f0-35b8-4559-9f4d-c7daf1af6012@redhat.com>
On 4/3/2026 9:03 AM, Paolo Bonzini wrote:
>
> But until the kernel starts using APX, I would do the save/restore near
> kvm_load_xfeatures(), because __vmx_vcpu_run()/__svm_vcpu_run() would
> have to check whether xcr0.apx is set or not.
Right, I'd much prefer this. Then, it requires to audit whether any
fast-path handler could access EGPRs.
But there are cases with the new {RD|WR}MSR (MSR_IMM) instructions that
appear to access GPRs. Because of this, the EGPR saving/restoring needs
to happen earlier.
next prev parent reply other threads:[~2026-04-03 22:05 UTC|newest]
Thread overview: 34+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-03-11 0:33 [PATCH 0/7] KVM: x86: APX reg prep work Sean Christopherson
2026-03-11 0:33 ` [PATCH 1/7] KVM: x86: Add dedicated storage for guest RIP Sean Christopherson
2026-03-11 0:33 ` [PATCH 2/7] KVM: x86: Drop the "EX" part of "EXREG" to avoid collision with APX Sean Christopherson
2026-03-11 18:46 ` Paolo Bonzini
2026-03-11 0:33 ` [PATCH 3/7] KVM: nVMX: Do a bitwise-AND of regs_avail when switching active VMCS Sean Christopherson
2026-03-11 0:33 ` [PATCH 4/7] KVM: x86: Add wrapper APIs to reset dirty/available register masks Sean Christopherson
2026-03-11 2:03 ` Yosry Ahmed
2026-03-11 13:31 ` Sean Christopherson
2026-03-11 18:28 ` Yosry Ahmed
2026-03-11 18:50 ` Paolo Bonzini
2026-03-13 0:38 ` Sean Christopherson
2026-03-11 0:33 ` [PATCH 5/7] KVM: x86: Track available/dirty register masks as "unsigned long" values Sean Christopherson
2026-03-11 0:33 ` [PATCH 6/7] KVM: x86: Use a proper bitmap for tracking available/dirty registers Sean Christopherson
2026-03-11 0:33 ` [PATCH 7/7] *** DO NOT MERGE *** KVM: x86: Pretend that APX is supported on 64-bit kernels Sean Christopherson
2026-03-11 19:01 ` [PATCH 0/7] KVM: x86: APX reg prep work Paolo Bonzini
2026-03-12 16:34 ` Chang S. Bae
2026-03-12 17:47 ` Sean Christopherson
2026-03-12 18:11 ` Andrew Cooper
2026-03-12 18:29 ` Sean Christopherson
2026-03-12 18:33 ` Andrew Cooper
2026-03-25 18:28 ` Chang S. Bae
2026-04-02 23:07 ` Sean Christopherson
2026-04-03 0:05 ` Chang S. Bae
2026-04-02 23:19 ` Sean Christopherson
2026-04-03 16:03 ` Paolo Bonzini
2026-04-03 22:05 ` Chang S. Bae [this message]
2026-04-04 5:16 ` Paolo Bonzini
2026-04-06 15:28 ` Sean Christopherson
2026-04-06 21:41 ` Paolo Bonzini
2026-04-06 22:00 ` Sean Christopherson
2026-04-07 7:18 ` Paolo Bonzini
2026-04-07 13:20 ` Sean Christopherson
2026-04-03 16:07 ` Dave Hansen
2026-04-06 15:40 ` Sean Christopherson
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