From: Borislav Petkov <bp@alien8.de>
To: Paolo Bonzini <pbonzini@redhat.com>
Cc: "Kernel Mailing List, Linux" <linux-kernel@vger.kernel.org>,
kvm <kvm@vger.kernel.org>, Jon Kohler <jon@nutanix.com>,
Marcelo Tosatti <mtosatti@redhat.com>,
Nikunj A Dadhania <nikunj@amd.com>, Amit Shah <amit.shah@amd.com>,
Sean Christopherson <seanjc@google.com>
Subject: Re: [PATCH 18/22] KVM: SVM: add GMET bit definitions
Date: Mon, 23 Mar 2026 13:26:03 +0100 [thread overview]
Message-ID: <20260323122603.GCacExW2F6WrBcuhBX@fat_crate.local> (raw)
In-Reply-To: <CABgObfYsNhfCpzoNP3bZaaS_AfhRwk9B2K0j55U_GMzLnvJ5TQ@mail.gmail.com>
On Mon, Mar 23, 2026 at 01:22:10PM +0100, Paolo Bonzini wrote:
> On Mon, Mar 23, 2026 at 1:17 PM Borislav Petkov <bp@alien8.de> wrote:
> > This is the key question: what in userspace is going to parse /proc/cpuinfo
> > and look for "gmet"?
>
> To be honest probably not. They can open /dev/kvm and call
> KVM_GET_SUPPORTED_CPUID to get the same information.
>
> The difference is that /proc/cpuinfo will always have gmet even if the
> module parameter is zero, while /dev/kvm won't. Based on your other
> message, it seems like you want this to be a bug rather than a
> feature, so let's shelve this, can you ack it with "" instead?
Right, you don't need to add any "" anymore - just a normal comment and that's
it. Lemme reply to the patch.
And *if* we ever decide that we need to show it to userspace, we can always do
that later but then we'll actually have a proper justification for doing so.
Thx.
--
Regards/Gruss,
Boris.
https://people.kernel.org/tglx/notes-about-netiquette
next prev parent reply other threads:[~2026-03-23 12:26 UTC|newest]
Thread overview: 56+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-03-21 0:09 [RFC PATCH 00/22] KVM: combined patchset for MBEC/GMET support Paolo Bonzini
2026-03-21 0:09 ` [PATCH 01/22] KVM: TDX/VMX: rework EPT_VIOLATION_EXEC_FOR_RING3_LIN into PROT_MASK Paolo Bonzini
2026-03-23 14:49 ` Jon Kohler
2026-03-25 4:29 ` Huang, Kai
2026-03-21 0:09 ` [PATCH 02/22] KVM: x86/mmu: remove SPTE_PERM_MASK Paolo Bonzini
2026-03-25 4:29 ` Huang, Kai
2026-03-21 0:09 ` [PATCH 03/22] KVM: x86/mmu: adjust MMIO generation bit allocation and allowed mask Paolo Bonzini
2026-03-24 3:48 ` Huang, Kai
2026-03-24 9:11 ` Paolo Bonzini
2026-03-21 0:09 ` [PATCH 04/22] KVM: x86/mmu: shuffle high bits of SPTEs in preparation for MBEC Paolo Bonzini
2026-03-25 4:35 ` Huang, Kai
2026-03-21 0:09 ` [PATCH 05/22] KVM: x86/mmu: remove SPTE_EPT_* Paolo Bonzini
2026-03-25 4:36 ` Huang, Kai
2026-03-21 0:09 ` [PATCH 06/22] KVM: x86/mmu: merge make_spte_{non,}executable Paolo Bonzini
2026-03-23 14:49 ` Jon Kohler
2026-03-21 0:09 ` [PATCH 07/22] KVM: x86/mmu: rename and clarify BYTE_MASK Paolo Bonzini
2026-03-21 0:09 ` [PATCH 08/22] KVM: x86/mmu: introduce ACC_READ_MASK Paolo Bonzini
2026-03-23 14:49 ` Jon Kohler
2026-03-23 14:49 ` Jon Kohler
2026-03-21 0:09 ` [PATCH 09/22] KVM: x86/mmu: separate more EPT/non-EPT permission_fault() Paolo Bonzini
2026-03-21 0:09 ` [PATCH 10/22] KVM: x86/mmu: split XS/XU bits for MBEC Paolo Bonzini
2026-03-24 10:45 ` Huang, Kai
2026-03-24 11:24 ` Paolo Bonzini
2026-03-25 4:28 ` Huang, Kai
2026-03-21 0:09 ` [PATCH 11/22] KVM: x86/mmu: move cr4_smep to base role Paolo Bonzini
2026-03-21 0:09 ` [PATCH 12/22] KVM: VMX: enable use of MBEC Paolo Bonzini
2026-03-23 14:49 ` Jon Kohler
2026-03-21 0:09 ` [PATCH 13/22] KVM: x86/mmu: add support for nested MBEC Paolo Bonzini
2026-03-23 14:49 ` Jon Kohler
2026-03-21 0:09 ` [PATCH 14/22] KVM: nVMX: advertise MBEC to nested guests Paolo Bonzini
2026-03-23 14:49 ` Jon Kohler
2026-03-21 0:09 ` [PATCH 15/22] KVM: nVMX: allow MBEC with EVMCS Paolo Bonzini
2026-03-21 0:09 ` [PATCH 16/22] KVM: x86/tdp_mmu: propagate access mask from kvm_mmu_page to PTE Paolo Bonzini
2026-03-21 0:09 ` [PATCH 17/22] KVM: x86/mmu: introduce cpu_role bit for availability of PFEC.I/D Paolo Bonzini
2026-03-21 0:09 ` [PATCH 18/22] KVM: SVM: add GMET bit definitions Paolo Bonzini
2026-03-21 11:58 ` Borislav Petkov
2026-03-21 13:51 ` Paolo Bonzini
2026-03-21 15:42 ` Borislav Petkov
2026-03-23 7:53 ` Paolo Bonzini
2026-03-23 12:17 ` Borislav Petkov
2026-03-23 12:22 ` Paolo Bonzini
2026-03-23 12:26 ` Borislav Petkov [this message]
2026-03-23 12:19 ` Borislav Petkov
2026-03-23 12:26 ` Borislav Petkov
2026-03-21 0:09 ` [PATCH 19/22] KVM: x86/mmu: add support for NPT GMET Paolo Bonzini
2026-03-21 0:09 ` [PATCH 20/22] KVM: SVM: enable GMET and set it in MMU role Paolo Bonzini
2026-03-25 9:25 ` Nikunj A. Dadhania
2026-03-25 9:29 ` Paolo Bonzini
2026-03-25 9:39 ` Nikunj A. Dadhania
2026-03-25 10:08 ` Paolo Bonzini
2026-03-21 0:09 ` [PATCH 21/22] KVM: SVM: work around errata 1218 Paolo Bonzini
2026-03-21 0:09 ` [PATCH 22/22] KVM: nSVM: enable GMET for guests Paolo Bonzini
2026-03-24 19:57 ` Jon Kohler
2026-03-25 5:22 ` Nikunj A. Dadhania
2026-03-25 12:55 ` Paolo Bonzini
2026-03-21 13:54 ` [RFC PATCH 00/22] KVM: combined patchset for MBEC/GMET support Paolo Bonzini
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20260323122603.GCacExW2F6WrBcuhBX@fat_crate.local \
--to=bp@alien8.de \
--cc=amit.shah@amd.com \
--cc=jon@nutanix.com \
--cc=kvm@vger.kernel.org \
--cc=linux-kernel@vger.kernel.org \
--cc=mtosatti@redhat.com \
--cc=nikunj@amd.com \
--cc=pbonzini@redhat.com \
--cc=seanjc@google.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox
all inboxes | Powered by JetHome®