[RFC PATCH v3 08/24] KVM: arm64: Add a vcpu flag to control SVE visibility for the guest
From: Dave Martin <Dave.Martin@arm.com>
Date: 2018-12-11 23:32:24
Also in:
kvmarm
Subsystem:
arm64 port (aarch64 architecture), kernel virtual machine for arm64 (kvm/arm64), the rest · Maintainers:
Catalin Marinas, Will Deacon, Marc Zyngier, Oliver Upton, Linus Torvalds
Since SVE will be enabled or disabled on a per-vcpu basis, a flag is needed in order to track which vcpus have it enabled. This patch adds a suitable flag and a helper for checking it. Signed-off-by: Dave Martin <Dave.Martin@arm.com> Reviewed-by: Alex Bennée <redacted> --- arch/arm64/include/asm/kvm_host.h | 4 ++++ 1 file changed, 4 insertions(+)
diff --git a/arch/arm64/include/asm/kvm_host.h b/arch/arm64/include/asm/kvm_host.h
index 3662ee0..c98f757 100644
--- a/arch/arm64/include/asm/kvm_host.h
+++ b/arch/arm64/include/asm/kvm_host.h@@ -309,6 +309,10 @@ struct kvm_vcpu_arch { #define KVM_ARM64_FP_HOST (1 << 2) /* host FP regs loaded */ #define KVM_ARM64_HOST_SVE_IN_USE (1 << 3) /* backup for host TIF_SVE */ #define KVM_ARM64_HOST_SVE_ENABLED (1 << 4) /* SVE enabled for EL0 */ +#define KVM_ARM64_GUEST_HAS_SVE (1 << 5) /* SVE exposed to guest */ + +#define vcpu_has_sve(vcpu) (system_supports_sve() && \ + ((vcpu)->arch.flags & KVM_ARM64_GUEST_HAS_SVE)) #define vcpu_gp_regs(v) (&(v)->arch.ctxt.gp_regs)
--
2.1.4
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