From: Reiji Watanabe <reijiw@google.com>
To: Marc Zyngier <maz@kernel.org>, kvmarm@lists.cs.columbia.edu
Cc: kvm@vger.kernel.org, linux-arm-kernel@lists.infradead.org,
James Morse <james.morse@arm.com>,
Alexandru Elisei <alexandru.elisei@arm.com>,
Suzuki K Poulose <suzuki.poulose@arm.com>,
Paolo Bonzini <pbonzini@redhat.com>,
Will Deacon <will@kernel.org>, Andrew Jones <drjones@redhat.com>,
Peng Liang <liangpeng10@huawei.com>,
Peter Shier <pshier@google.com>,
Ricardo Koller <ricarkol@google.com>,
Oliver Upton <oupton@google.com>,
Jing Zhang <jingzhangos@google.com>,
Raghavendra Rao Anata <rananta@google.com>,
Reiji Watanabe <reijiw@google.com>
Subject: [RFC PATCH 15/25] KVM: arm64: Introduce KVM_CAP_ARM_ID_REG_WRITABLE capability
Date: Mon, 11 Oct 2021 21:35:25 -0700 [thread overview]
Message-ID: <20211012043535.500493-16-reijiw@google.com> (raw)
In-Reply-To: <20211012043535.500493-1-reijiw@google.com>
Introduce a new capability KVM_CAP_ARM_ID_REG_WRITABLE to indicate
that ID registers are writable by userspace.
Signed-off-by: Reiji Watanabe <reijiw@google.com>
---
Documentation/virt/kvm/api.rst | 8 ++++++++
arch/arm64/kvm/arm.c | 1 +
include/uapi/linux/kvm.h | 1 +
3 files changed, 10 insertions(+)
diff --git a/Documentation/virt/kvm/api.rst b/Documentation/virt/kvm/api.rst
index a6729c8cf063..f7dfb5127310 100644
--- a/Documentation/virt/kvm/api.rst
+++ b/Documentation/virt/kvm/api.rst
@@ -7265,3 +7265,11 @@ The argument to KVM_ENABLE_CAP is also a bitmask, and must be a subset
of the result of KVM_CHECK_EXTENSION. KVM will forward to userspace
the hypercalls whose corresponding bit is in the argument, and return
ENOSYS for the others.
+
+8.35 KVM_CAP_ARM_ID_REG_WRITABLE
+--------------------------------
+
+:Architectures: arm64
+
+This capability indicates that userspace can modify the ID registers
+via KVM_SET_ONE_REG ioctl.
diff --git a/arch/arm64/kvm/arm.c b/arch/arm64/kvm/arm.c
index 820f35051d77..29c13a32dd21 100644
--- a/arch/arm64/kvm/arm.c
+++ b/arch/arm64/kvm/arm.c
@@ -197,6 +197,7 @@ int kvm_vm_ioctl_check_extension(struct kvm *kvm, long ext)
case KVM_CAP_SET_GUEST_DEBUG:
case KVM_CAP_VCPU_ATTRIBUTES:
case KVM_CAP_PTP_KVM:
+ case KVM_CAP_ARM_ID_REG_WRITABLE:
r = 1;
break;
case KVM_CAP_SET_GUEST_DEBUG2:
diff --git a/include/uapi/linux/kvm.h b/include/uapi/linux/kvm.h
index a067410ebea5..3345a57f05a6 100644
--- a/include/uapi/linux/kvm.h
+++ b/include/uapi/linux/kvm.h
@@ -1112,6 +1112,7 @@ struct kvm_ppc_resize_hpt {
#define KVM_CAP_BINARY_STATS_FD 203
#define KVM_CAP_EXIT_ON_EMULATION_FAILURE 204
#define KVM_CAP_ARM_MTE 205
+#define KVM_CAP_ARM_ID_REG_WRITABLE 206
#ifdef KVM_CAP_IRQ_ROUTING
--
2.33.0.882.g93a45727a2-goog
_______________________________________________
linux-arm-kernel mailing list
linux-arm-kernel@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
next prev parent reply other threads:[~2021-10-12 4:46 UTC|newest]
Thread overview: 36+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-10-12 4:35 [RFC PATCH 00/25] KVM: arm64: Make CPU ID registers writable by userspace Reiji Watanabe
2021-10-12 4:35 ` [RFC PATCH 01/25] KVM: arm64: Add has_reset_once flag for vcpu Reiji Watanabe
2021-10-15 10:12 ` Andrew Jones
2021-10-16 19:54 ` Reiji Watanabe
2021-10-12 4:35 ` [RFC PATCH 02/25] KVM: arm64: Save ID registers' sanitized value per vCPU Reiji Watanabe
2021-10-15 13:09 ` Andrew Jones
2021-10-17 0:42 ` Reiji Watanabe
2021-10-18 14:30 ` Andrew Jones
2021-10-18 23:54 ` Reiji Watanabe
2021-10-12 4:35 ` [RFC PATCH 03/25] KVM: arm64: Introduce a validation function for an ID register Reiji Watanabe
2021-10-15 13:30 ` Andrew Jones
[not found] ` <CAAeT=Fy-enk=X_PaRSDEKQ01yQzdyU=bcpq8cuCZhtpzC=JvnQ@mail.gmail.com>
[not found] ` <20211018144215.fvz7lrqiqlwhadms@gator.home>
[not found] ` <CAAeT=FyvRg7cD9-N81BM4gz0FaZHcaoWWQptniB5zDKdL=OkXg@mail.gmail.com>
[not found] ` <20211019062516.smjbbil5ugbipwno@gator.home>
2021-10-19 7:26 ` Reiji Watanabe
2021-10-12 4:35 ` [RFC PATCH 04/25] KVM: arm64: Introduce struct id_reg_info Reiji Watanabe
2021-10-15 13:47 ` Andrew Jones
2021-10-17 4:43 ` Reiji Watanabe
2021-10-12 4:35 ` [RFC PATCH 05/25] KVM: arm64: Keep consistency of ID registers between vCPUs Reiji Watanabe
2021-10-12 4:35 ` [RFC PATCH 06/25] KVM: arm64: Make ID_AA64PFR0_EL1 writable Reiji Watanabe
2021-10-12 4:35 ` [RFC PATCH 07/25] KVM: arm64: Make ID_AA64PFR1_EL1 writable Reiji Watanabe
2021-10-12 4:35 ` [RFC PATCH 08/25] KVM: arm64: Make ID_AA64ISAR0_EL1 writable Reiji Watanabe
2021-10-12 4:35 ` [RFC PATCH 09/25] KVM: arm64: Make ID_AA64ISAR1_EL1 writable Reiji Watanabe
2021-10-12 4:35 ` [RFC PATCH 10/25] KVM: arm64: Make ID_AA64DFR0_EL1 writable Reiji Watanabe
2021-10-12 4:35 ` [RFC PATCH 11/25] KVM: arm64: Make ID_DFR0_EL1 writable Reiji Watanabe
2021-10-12 4:35 ` [RFC PATCH 12/25] KVM: arm64: Make MVFR1_EL1 writable Reiji Watanabe
2021-10-12 4:35 ` [RFC PATCH 13/25] KVM: arm64: Make ID registers without id_reg_info writable Reiji Watanabe
2021-10-12 4:35 ` [RFC PATCH 14/25] KVM: arm64: Add consistency checking for frac fields of ID registers Reiji Watanabe
2021-10-12 4:35 ` Reiji Watanabe [this message]
2021-10-12 4:35 ` [RFC PATCH 16/25] KVM: arm64: Use vcpu->arch cptr_el2 to track value of cptr_el2 for VHE Reiji Watanabe
2021-10-12 4:35 ` [RFC PATCH 17/25] KVM: arm64: Use vcpu->arch.mdcr_el2 to track value of mdcr_el2 Reiji Watanabe
2021-10-12 4:35 ` [RFC PATCH 18/25] KVM: arm64: Introduce framework to trap disabled features Reiji Watanabe
2021-10-12 4:35 ` [RFC PATCH 19/25] KVM: arm64: Trap disabled features of ID_AA64PFR0_EL1 Reiji Watanabe
2021-10-12 4:35 ` [RFC PATCH 20/25] KVM: arm64: Trap disabled features of ID_AA64PFR1_EL1 Reiji Watanabe
2021-10-12 4:35 ` [RFC PATCH 21/25] KVM: arm64: Trap disabled features of ID_AA64DFR0_EL1 Reiji Watanabe
2021-10-12 4:35 ` [RFC PATCH 22/25] KVM: arm64: Trap disabled features of ID_AA64MMFR1_EL1 Reiji Watanabe
2021-10-12 4:35 ` [RFC PATCH 23/25] KVM: arm64: Trap disabled features of ID_AA64ISAR1_EL1 Reiji Watanabe
2021-10-12 4:35 ` [RFC PATCH 24/25] KVM: arm64: Activate trapping of disabled CPU features for the guest Reiji Watanabe
2021-10-12 4:35 ` [RFC PATCH 25/25] KVM: arm64: selftests: Introduce id_reg_test Reiji Watanabe
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=20211012043535.500493-16-reijiw@google.com \
--to=reijiw@google.com \
--cc=alexandru.elisei@arm.com \
--cc=drjones@redhat.com \
--cc=james.morse@arm.com \
--cc=jingzhangos@google.com \
--cc=kvm@vger.kernel.org \
--cc=kvmarm@lists.cs.columbia.edu \
--cc=liangpeng10@huawei.com \
--cc=linux-arm-kernel@lists.infradead.org \
--cc=maz@kernel.org \
--cc=oupton@google.com \
--cc=pbonzini@redhat.com \
--cc=pshier@google.com \
--cc=rananta@google.com \
--cc=ricarkol@google.com \
--cc=suzuki.poulose@arm.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