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KVM: arm64/sve: Allow userspace to enable SVE for vcpus

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Now that all the pieces are in place, this patch offers a new flag
KVM_ARM_VCPU_SVE that userspace can pass to KVM_ARM_VCPU_INIT to
turn on SVE for the guest, on a per-vcpu basis.

As part of this, support for initialisation and reset of the SVE
vector length set and registers is added in the appropriate places,
as well as finally setting the KVM_ARM64_GUEST_HAS_SVE vcpu flag,
to turn on the SVE support code.

Allocation of the SVE register storage in vcpu->arch.sve_state is
deferred until the SVE configuration is finalized, by which time
the size of the registers is known.

Setting the vector lengths supported by the vcpu is considered
configuration of the emulated hardware rather than runtime
configuration, so no support is offered for changing the vector
lengths available to an existing vcpu across reset.

Signed-off-by: Dave Martin <Dave.Martin@arm.com>
Reviewed-by: Julien Thierry <julien.thierry@arm.com>
Tested-by: zhang.lei <zhang.lei@jp.fujitsu.com>
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
This commit is contained in:
Dave Martin
2019-02-28 18:56:50 +00:00
committed by Marc Zyngier
parent 9033bba4b5
commit 9a3cdf26e3
2 changed files with 43 additions and 3 deletions
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3
arch/arm64/include/asm/kvm_host.h
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@@ -49,8 +49,7 @@
#define KVM_MAX_VCPUS VGIC_V3_MAX_CPUS
/* Will be incremented when KVM_ARM_VCPU_SVE is fully implemented: */
#define KVM_VCPU_MAX_FEATURES 4
#define KVM_VCPU_MAX_FEATURES 5
#define KVM_REQ_SLEEP \
KVM_ARCH_REQ_FLAGS(0, KVM_REQUEST_WAIT | KVM_REQUEST_NO_WAKEUP)