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[RFC,v3,08/24] KVM: arm64: Add a vcpu flag to control SVE visibility for the guest

Message ID 1544570941-7377-9-git-send-email-Dave.Martin@arm.com (mailing list archive)
State RFC, archived
Headers show
Series KVM: arm64: SVE guest support | expand

Commit Message

Dave Martin Dec. 11, 2018, 11:28 p.m. UTC 
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 <alex.bennee@linaro.org>
---
 arch/arm64/include/asm/kvm_host.h | 4 ++++
 1 file changed, 4 insertions(+)
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Patch

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)