From: Marc Zyngier <maz@kernel.org>
To: Mark Brown <broonie@kernel.org>
Cc: Catalin Marinas <catalin.marinas@arm.com>,
Will Deacon <will@kernel.org>,
Oliver Upton <oliver.upton@linux.dev>,
James Morse <james.morse@arm.com>,
Suzuki K Poulose <suzuki.poulose@arm.com>,
Fuad Tabba <tabba@google.com>,
linux-arm-kernel@lists.infradead.org,
linux-kernel@vger.kernel.org, kvmarm@lists.linux.dev
Subject: Re: [PATCH 2/4] arm64/fpsimd: Discover maximum vector length implemented by any CPU
Date: Wed, 05 Jun 2024 13:13:20 +0100 [thread overview]
Message-ID: <86bk4flh9b.wl-maz@kernel.org> (raw)
In-Reply-To: <20240605-kvm-arm64-fix-pkvm-sve-vl-v1-2-680d6b43b4c1@kernel.org>
On Wed, 05 Jun 2024 12:41:28 +0100,
Mark Brown <broonie@kernel.org> wrote:
>
> @@ -1083,6 +1095,18 @@ int vec_verify_vq_map(enum vec_type type)
> if (!IS_ENABLED(CONFIG_KVM) || !is_hyp_mode_available())
> return 0;
>
> + /*
> + * pKVM allocates and uses storage for host state based on the
> + * largest per-PE VL, reject new PEs with a larger maximum.
> + */
> + if (is_protected_kvm_enabled()) {
> + if (max_vl > info->max_cpu_vl) {
> + pr_warn("%s: cpu%d: would increase maximum VL\n",
> + info->name, smp_processor_id());
> + return -EINVAL;
> + }
> + }
> +
Once protected mode is enabled, no new CPU can be booted (see
psci_relay.c::psci_cpu_on()).
M.
--
Without deviation from the norm, progress is not possible.
next prev parent reply other threads:[~2024-06-05 12:13 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-06-05 11:41 [PATCH 0/4] KVM: arm64: Fix underallocation of storage for SVE state Mark Brown
2024-06-05 11:41 ` [PATCH 1/4] arm64/fpsimd: Introduce __bit_to_vl() helper Mark Brown
2024-06-05 11:41 ` [PATCH 2/4] arm64/fpsimd: Discover maximum vector length implemented by any CPU Mark Brown
2024-06-05 12:03 ` Fuad Tabba
2024-06-05 12:56 ` Mark Brown
2024-06-05 12:13 ` Marc Zyngier [this message]
2024-06-05 12:31 ` Mark Brown
2024-06-05 11:41 ` [PATCH 3/4] KVM: arm64: Fix FFR offset calculation for pKVM host state save and restore Mark Brown
2024-06-05 12:12 ` Fuad Tabba
2024-06-05 13:17 ` Mark Brown
2024-06-05 11:41 ` [PATCH 4/4] KVM: arm64: Avoid underallocating storage for host SVE state Mark Brown
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=86bk4flh9b.wl-maz@kernel.org \
--to=maz@kernel.org \
--cc=broonie@kernel.org \
--cc=catalin.marinas@arm.com \
--cc=james.morse@arm.com \
--cc=kvmarm@lists.linux.dev \
--cc=linux-arm-kernel@lists.infradead.org \
--cc=linux-kernel@vger.kernel.org \
--cc=oliver.upton@linux.dev \
--cc=suzuki.poulose@arm.com \
--cc=tabba@google.com \
--cc=will@kernel.org \
/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®