From: Dave Martin <Dave.Martin@arm.com>
To: kvmarm@lists.cs.columbia.edu
Cc: Christoffer Dall <cdall@kernel.org>,
Marc Zyngier <marc.zyngier@arm.com>,
Andre Przywara <andre.przywara@arm.com>,
Will Deacon <will.deacon@arm.com>,
Kristina Martsenko <kristina.martsenko@arm.com>,
Zhang Lei <zhang.lei@jp.fujitsu.com>,
Amit Daniel Kachhap <amit.kachhap@arm.com>,
linux-arm-kernel@lists.infradead.org
Subject: [PATCH kvmtool v3 8/9] arm64: Add SVE support
Date: Thu, 30 May 2019 16:13:13 +0100 [thread overview]
Message-ID: <1559229194-3036-9-git-send-email-Dave.Martin@arm.com> (raw)
In-Reply-To: <1559229194-3036-1-git-send-email-Dave.Martin@arm.com>
This patch adds --enable-sve/--disable-sve command line options to
allow the user to control whether the Scalable Vector Extension is
made available to the guest.
This requires use of the new KVM_ARM_VCPU_FINALIZE ioctl before the
vcpu is runnable, so a new hook kvm_cpu__configure_features() is
added to provide an appropriate place to do this work.
By default, SVE is enabled for the guest if the host supports it.
Signed-off-by: Dave Martin <Dave.Martin@arm.com>
---
arm/aarch32/include/kvm/kvm-cpu-arch.h | 4 +++
arm/aarch64/include/kvm/kvm-config-arch.h | 6 ++++-
arm/aarch64/include/kvm/kvm-cpu-arch.h | 1 +
arm/aarch64/kvm-cpu.c | 41 +++++++++++++++++++++++++++++++
arm/include/arm-common/kvm-config-arch.h | 2 ++
arm/kvm-cpu.c | 3 +++
6 files changed, 56 insertions(+), 1 deletion(-)
diff --git a/arm/aarch32/include/kvm/kvm-cpu-arch.h b/arm/aarch32/include/kvm/kvm-cpu-arch.h
index 01983f0..780e0e2 100644
--- a/arm/aarch32/include/kvm/kvm-cpu-arch.h
+++ b/arm/aarch32/include/kvm/kvm-cpu-arch.h
@@ -15,5 +15,9 @@
static inline void kvm_cpu__select_features(struct kvm *kvm,
struct kvm_vcpu_init *init) { }
+static inline int kvm_cpu__configure_features(struct kvm_cpu *vcpu)
+{
+ return 0;
+}
#endif /* KVM__KVM_CPU_ARCH_H */
diff --git a/arm/aarch64/include/kvm/kvm-config-arch.h b/arm/aarch64/include/kvm/kvm-config-arch.h
index fe1699d..41e9d05 100644
--- a/arm/aarch64/include/kvm/kvm-config-arch.h
+++ b/arm/aarch64/include/kvm/kvm-config-arch.h
@@ -12,7 +12,11 @@
OPT_BOOLEAN('\0', "enable-ptrauth", &(cfg)->enable_ptrauth, \
"Enable pointer authentication for the guest"), \
OPT_BOOLEAN('\0', "disable-ptrauth", &(cfg)->disable_ptrauth, \
- "Disable pointer authentication for the guest"),
+ "Disable pointer authentication for the guest"), \
+ OPT_BOOLEAN('\0', "enable-sve", &(cfg)->enable_sve, \
+ "Enable SVE for the guest"), \
+ OPT_BOOLEAN('\0', "disable-sve", &(cfg)->disable_sve, \
+ "Disable SVE for the guest"),
#include "arm-common/kvm-config-arch.h"
diff --git a/arm/aarch64/include/kvm/kvm-cpu-arch.h b/arm/aarch64/include/kvm/kvm-cpu-arch.h
index e6875fc..8dfb82e 100644
--- a/arm/aarch64/include/kvm/kvm-cpu-arch.h
+++ b/arm/aarch64/include/kvm/kvm-cpu-arch.h
@@ -18,5 +18,6 @@
#define ARM_CPU_CTRL_SCTLR_EL1 0
void kvm_cpu__select_features(struct kvm *kvm, struct kvm_vcpu_init *init);
+int kvm_cpu__configure_features(struct kvm_cpu *vcpu);
#endif /* KVM__KVM_CPU_ARCH_H */
diff --git a/arm/aarch64/kvm-cpu.c b/arm/aarch64/kvm-cpu.c
index 08e4fd5..cdfb22e 100644
--- a/arm/aarch64/kvm-cpu.c
+++ b/arm/aarch64/kvm-cpu.c
@@ -152,9 +152,50 @@ static void select_ptrauth_feature(struct kvm *kvm, struct kvm_vcpu_init *init)
}
}
+static void select_sve_feature(struct kvm *kvm, struct kvm_vcpu_init *init)
+{
+ bool supported;
+
+ if (kvm->cfg.arch.enable_sve && kvm->cfg.arch.disable_sve)
+ die("--enable-sve conflicts with --disable-sve");
+
+ supported = kvm__supports_extension(kvm, KVM_CAP_ARM_SVE);
+
+ if (kvm->cfg.arch.enable_sve && !supported)
+ die("--enable-sve not supported on this host");
+
+ /* Default SVE to on if available and not explicitly disabled */
+ if (supported && !kvm->cfg.arch.disable_sve) {
+ kvm->cfg.arch.enable_sve = true;
+ init->features[0] |= 1UL << KVM_ARM_VCPU_SVE;
+ }
+}
+
void kvm_cpu__select_features(struct kvm *kvm, struct kvm_vcpu_init *init)
{
select_ptrauth_feature(kvm, init);
+ select_sve_feature(kvm, init);
+}
+
+static int configure_sve(struct kvm_cpu *vcpu)
+{
+ int feature = KVM_ARM_VCPU_SVE;
+
+ if (ioctl(vcpu->vcpu_fd, KVM_ARM_VCPU_FINALIZE, &feature)) {
+ pr_err("KVM_ARM_VCPU_FINALIZE: %s", strerror(errno));
+ return -1;
+ }
+
+ return 0;
+}
+
+int kvm_cpu__configure_features(struct kvm_cpu *vcpu)
+{
+ if (vcpu->kvm->cfg.arch.enable_sve)
+ if (configure_sve(vcpu))
+ return -1;
+
+ return 0;
}
void kvm_cpu__reset_vcpu(struct kvm_cpu *vcpu)
diff --git a/arm/include/arm-common/kvm-config-arch.h b/arm/include/arm-common/kvm-config-arch.h
index 1b4287d..40e3d1f 100644
--- a/arm/include/arm-common/kvm-config-arch.h
+++ b/arm/include/arm-common/kvm-config-arch.h
@@ -10,6 +10,8 @@ struct kvm_config_arch {
bool aarch32_guest;
bool has_pmuv3;
u64 kaslr_seed;
+ bool enable_sve;
+ bool disable_sve;
bool enable_ptrauth;
bool disable_ptrauth;
enum irqchip_type irqchip;
diff --git a/arm/kvm-cpu.c b/arm/kvm-cpu.c
index 1652f6f..554414f 100644
--- a/arm/kvm-cpu.c
+++ b/arm/kvm-cpu.c
@@ -124,6 +124,9 @@ struct kvm_cpu *kvm_cpu__arch_init(struct kvm *kvm, unsigned long cpu_id)
vcpu->cpu_compatible = target->compatible;
vcpu->is_running = true;
+ if (kvm_cpu__configure_features(vcpu))
+ die("Unable to configure requested vcpu features");
+
return vcpu;
}
--
2.1.4
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next prev parent reply other threads:[~2019-05-30 15:14 UTC|newest]
Thread overview: 31+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-05-30 15:13 [PATCH kvmtool v3 0/9] arm64: Pointer Authentication and SVE support Dave Martin
2019-05-30 15:13 ` [PATCH kvmtool v3 1/9] update_headers.sh: Add missing shell quoting Dave Martin
2019-05-31 17:02 ` Andre Przywara
2019-06-03 10:40 ` Dave Martin
2019-05-30 15:13 ` [PATCH kvmtool v3 2/9] update_headers.sh: Cleanly report failure on error Dave Martin
2019-05-31 17:03 ` Andre Przywara
2019-06-03 10:41 ` Dave Martin
2019-05-30 15:13 ` [PATCH kvmtool v3 3/9] update_headers.sh: arm64: Copy sve_context.h if available Dave Martin
2019-05-31 17:03 ` Andre Przywara
2019-06-03 11:08 ` Dave Martin
2019-05-30 15:13 ` [PATCH kvmtool v3 4/9] update_headers: Sync kvm UAPI headers with linux v5.1-rc1 Dave Martin
2019-05-31 17:03 ` Andre Przywara
2019-06-03 11:10 ` Dave Martin
2019-05-30 15:13 ` [PATCH kvmtool v3 5/9] KVM: arm/arm64: Add a vcpu feature for pointer authentication Dave Martin
2019-05-31 17:04 ` Andre Przywara
2019-06-03 11:23 ` Dave Martin
2019-06-03 14:03 ` Andre Przywara
2019-06-03 14:18 ` Dave Martin
2019-06-03 14:07 ` Will Deacon
2019-06-03 14:17 ` Dave Martin
2019-06-03 13:48 ` Dave Martin
2019-05-30 15:13 ` [PATCH kvmtool v3 6/9] arm/arm64: Factor out ptrauth vcpu feature setup Dave Martin
2019-05-31 17:04 ` Andre Przywara
2019-06-03 11:12 ` Dave Martin
2019-05-30 15:13 ` [PATCH kvmtool v3 7/9] arm64: Make ptrauth enable/disable diagnostics more user-friendly Dave Martin
2019-05-31 17:05 ` Andre Przywara
2019-06-03 11:14 ` Dave Martin
2019-05-30 15:13 ` Dave Martin [this message]
2019-05-31 17:13 ` [PATCH kvmtool v3 8/9] arm64: Add SVE support Andre Przywara
2019-06-03 11:15 ` Dave Martin
2019-05-30 15:13 ` [PATCH kvmtool v3 9/9] arm64: Select SVE vector lengths via the command line Dave Martin
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