From: Will Deacon <will@kernel.org>
To: kvmarm@lists.cs.columbia.edu
Cc: kvm@vger.kernel.org, Marc Zyngier <maz@kernel.org>,
linux-arm-kernel@lists.infradead.org,
Sean Christopherson <seanjc@google.com>,
Paolo Bonzini <pbonzini@redhat.com>,
Will Deacon <will@kernel.org>
Subject: [PATCH 1/4] KVM: arm64: Ignore 'kvm-arm.mode=protected' when using VHE
Date: Thu, 3 Jun 2021 19:33:44 +0100 [thread overview]
Message-ID: <20210603183347.1695-2-will@kernel.org> (raw)
In-Reply-To: <20210603183347.1695-1-will@kernel.org>
Ignore 'kvm-arm.mode=protected' when using VHE so that kvm_get_mode()
only returns KVM_MODE_PROTECTED on systems where the feature is available.
Cc: David Brazdil <dbrazdil@google.com>
Signed-off-by: Will Deacon <will@kernel.org>
---
Documentation/admin-guide/kernel-parameters.txt | 1 -
arch/arm64/kernel/cpufeature.c | 10 +---------
arch/arm64/kvm/arm.c | 6 +++++-
3 files changed, 6 insertions(+), 11 deletions(-)
diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentation/admin-guide/kernel-parameters.txt
index cb89dbdedc46..e85dbdf1ee8e 100644
--- a/Documentation/admin-guide/kernel-parameters.txt
+++ b/Documentation/admin-guide/kernel-parameters.txt
@@ -2300,7 +2300,6 @@
protected: nVHE-based mode with support for guests whose
state is kept private from the host.
- Not valid if the kernel is running in EL2.
Defaults to VHE/nVHE based on hardware support.
diff --git a/arch/arm64/kernel/cpufeature.c b/arch/arm64/kernel/cpufeature.c
index efed2830d141..dc1f2e747828 100644
--- a/arch/arm64/kernel/cpufeature.c
+++ b/arch/arm64/kernel/cpufeature.c
@@ -1773,15 +1773,7 @@ static void cpu_enable_mte(struct arm64_cpu_capabilities const *cap)
#ifdef CONFIG_KVM
static bool is_kvm_protected_mode(const struct arm64_cpu_capabilities *entry, int __unused)
{
- if (kvm_get_mode() != KVM_MODE_PROTECTED)
- return false;
-
- if (is_kernel_in_hyp_mode()) {
- pr_warn("Protected KVM not available with VHE\n");
- return false;
- }
-
- return true;
+ return kvm_get_mode() == KVM_MODE_PROTECTED;
}
#endif /* CONFIG_KVM */
diff --git a/arch/arm64/kvm/arm.c b/arch/arm64/kvm/arm.c
index 1cb39c0803a4..8d5e23198dfd 100644
--- a/arch/arm64/kvm/arm.c
+++ b/arch/arm64/kvm/arm.c
@@ -2121,7 +2121,11 @@ static int __init early_kvm_mode_cfg(char *arg)
return -EINVAL;
if (strcmp(arg, "protected") == 0) {
- kvm_mode = KVM_MODE_PROTECTED;
+ if (!is_kernel_in_hyp_mode())
+ kvm_mode = KVM_MODE_PROTECTED;
+ else
+ pr_warn_once("Protected KVM not available with VHE\n");
+
return 0;
}
--
2.32.0.rc0.204.g9fa02ecfa5-goog
_______________________________________________
kvmarm mailing list
kvmarm@lists.cs.columbia.edu
https://lists.cs.columbia.edu/mailman/listinfo/kvmarm
next prev parent reply other threads:[~2021-06-03 18:34 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-06-03 18:33 [PATCH 0/4] kvm/arm64: Initial pKVM user ABI Will Deacon
2021-06-03 18:33 ` Will Deacon [this message]
2021-06-04 14:01 ` [PATCH 1/4] KVM: arm64: Ignore 'kvm-arm.mode=protected' when using VHE Mark Rutland
2021-06-07 19:28 ` Will Deacon
2021-06-03 18:33 ` [PATCH 2/4] KVM: arm64: Extend comment in has_vhe() Will Deacon
2021-06-04 14:09 ` Mark Rutland
2021-06-03 18:33 ` [PATCH 3/4] KVM: arm64: Parse reserved-memory node for pkvm guest firmware region Will Deacon
2021-06-04 14:21 ` Mark Rutland
2021-06-08 12:03 ` Will Deacon
2021-06-03 18:33 ` [RFC PATCH 4/4] KVM: arm64: Introduce KVM_CAP_ARM_PROTECTED_VM Will Deacon
2021-06-03 20:15 ` Sean Christopherson
2021-06-08 12:08 ` Will Deacon
2021-06-11 13:25 ` Alexandru Elisei
2021-06-04 14:41 ` Mark Rutland
2021-06-08 12:06 ` Will Deacon
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=20210603183347.1695-2-will@kernel.org \
--to=will@kernel.org \
--cc=kvm@vger.kernel.org \
--cc=kvmarm@lists.cs.columbia.edu \
--cc=linux-arm-kernel@lists.infradead.org \
--cc=maz@kernel.org \
--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;
as well as URLs for NNTP newsgroup(s).