linux-kernel - [PATCH v4 2/2] arm/arm64: KVM: enable 32 bits kvm vcpu events support

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Date:   Sat, 13 Oct 2018 00:12:49 +0800
From:   Dongjiu Geng <gengdongjiu@...wei.com>
To:     <christoffer.dall@....com>, <marc.zyngier@....com>,
        <suzuki.poulose@....com>, <james.morse@....com>,
        <peter.maydell@...aro.org>, <drjones@...hat.com>,
        <linux-arm-kernel@...ts.infradead.org>,
        <kvmarm@...ts.cs.columbia.edu>, <linux-kernel@...r.kernel.org>,
        <kvm@...r.kernel.org>
CC:     <gengdongjiu@...wei.com>
Subject: [PATCH v4 2/2] arm/arm64: KVM: enable 32 bits kvm vcpu events support

The commit 539aee0edb9f ("KVM: arm64: Share the parts of
get/set events useful to 32bit") shares the get/set events
helper for arm64 and arm32, but forgot to share the cap
extension code.

User space will check whether KVM supports vcpu events by
checking the KVM_CAP_VCPU_EVENTS extension

Cc: James Morse <james.morse@....com>
Reviewed-by : Suzuki K Poulose <suzuki.poulose@....com>
Signed-off-by: Dongjiu Geng <gengdongjiu@...wei.com>
Acked-by: James Morse <james.morse@....com>
---
For the 32 bits kvm migration, it needs to enable the vcpu events,
this patch will enable it. The user space QEMU patch is here:
https://patchwork.ozlabs.org/patch/975615/
---
 arch/arm64/kvm/reset.c | 1 -
 virt/kvm/arm/arm.c     | 1 +
 2 files changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/arm64/kvm/reset.c b/arch/arm64/kvm/reset.c
index fd37c53..e50245e 100644
--- a/arch/arm64/kvm/reset.c
+++ b/arch/arm64/kvm/reset.c
@@ -82,7 +82,6 @@ int kvm_arch_vm_ioctl_check_extension(struct kvm *kvm, long ext)
 		break;
 	case KVM_CAP_SET_GUEST_DEBUG:
 	case KVM_CAP_VCPU_ATTRIBUTES:
-	case KVM_CAP_VCPU_EVENTS:
 		r = 1;
 		break;
 	default:
diff --git a/virt/kvm/arm/arm.c b/virt/kvm/arm/arm.c
index 40e79ea..64e5d97 100644
--- a/virt/kvm/arm/arm.c
+++ b/virt/kvm/arm/arm.c
@@ -212,6 +212,7 @@ int kvm_vm_ioctl_check_extension(struct kvm *kvm, long ext)
 	case KVM_CAP_READONLY_MEM:
 	case KVM_CAP_MP_STATE:
 	case KVM_CAP_IMMEDIATE_EXIT:
+	case KVM_CAP_VCPU_EVENTS:
 		r = 1;
 		break;
 	case KVM_CAP_ARM_SET_DEVICE_ADDR:
-- 
1.9.1