linux-kernel - [PATCH v4 2/4] KVM: arm64: Make VMID bits accessible outside of allocator

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Date:   Mon, 22 Nov 2021 12:18:42 +0000
From:   Shameer Kolothum <shameerali.kolothum.thodi@...wei.com>
To:     <linux-arm-kernel@...ts.infradead.org>,
        <kvmarm@...ts.cs.columbia.edu>, <linux-kernel@...r.kernel.org>
CC:     <maz@...nel.org>, <will@...nel.org>, <catalin.marinas@....com>,
        <james.morse@....com>, <julien.thierry.kdev@...il.com>,
        <suzuki.poulose@....com>, <jean-philippe@...aro.org>,
        <Alexandru.Elisei@....com>, <qperret@...gle.com>,
        <jonathan.cameron@...wei.com>, <linuxarm@...wei.com>
Subject: [PATCH v4 2/4] KVM: arm64: Make VMID bits accessible outside of allocator

Since we already set the kvm_arm_vmid_bits in the VMID allocator
init function, make it accessible outside as well so that it can
be used in the subsequent patch.

Suggested-by: Will Deacon <will@...nel.org>
Signed-off-by: Shameer Kolothum <shameerali.kolothum.thodi@...wei.com>
---
 arch/arm64/include/asm/kvm_host.h | 1 +
 arch/arm64/kernel/image-vars.h    | 3 +++
 arch/arm64/kvm/vmid.c             | 2 +-
 3 files changed, 5 insertions(+), 1 deletion(-)

diff --git a/arch/arm64/include/asm/kvm_host.h b/arch/arm64/include/asm/kvm_host.h
index f4a86a79ea4a..51af17e16115 100644
--- a/arch/arm64/include/asm/kvm_host.h
+++ b/arch/arm64/include/asm/kvm_host.h
@@ -690,6 +690,7 @@ int kvm_arm_pvtime_get_attr(struct kvm_vcpu *vcpu,
 int kvm_arm_pvtime_has_attr(struct kvm_vcpu *vcpu,
 			    struct kvm_device_attr *attr);
 
+extern unsigned int kvm_arm_vmid_bits;
 int kvm_arm_vmid_alloc_init(void);
 void kvm_arm_vmid_alloc_free(void);
 void kvm_arm_vmid_update(struct kvm_vmid *kvm_vmid);
diff --git a/arch/arm64/kernel/image-vars.h b/arch/arm64/kernel/image-vars.h
index c96a9a0043bf..c12963c3a055 100644
--- a/arch/arm64/kernel/image-vars.h
+++ b/arch/arm64/kernel/image-vars.h
@@ -79,6 +79,9 @@ KVM_NVHE_ALIAS(__hyp_stub_vectors);
 /* Kernel symbol used by icache_is_vpipt(). */
 KVM_NVHE_ALIAS(__icache_flags);
 
+/* VMID bits set by the KVM VMID allocator */
+KVM_NVHE_ALIAS(kvm_arm_vmid_bits);
+
 /* Kernel symbols needed for cpus_have_final/const_caps checks. */
 KVM_NVHE_ALIAS(arm64_const_caps_ready);
 KVM_NVHE_ALIAS(cpu_hwcap_keys);
diff --git a/arch/arm64/kvm/vmid.c b/arch/arm64/kvm/vmid.c
index aa01c97f7df0..9aff692b6b7d 100644
--- a/arch/arm64/kvm/vmid.c
+++ b/arch/arm64/kvm/vmid.c
@@ -16,7 +16,7 @@
 #include <asm/kvm_asm.h>
 #include <asm/kvm_mmu.h>
 
-static unsigned int kvm_arm_vmid_bits;
+unsigned int kvm_arm_vmid_bits;
 static DEFINE_RAW_SPINLOCK(cpu_vmid_lock);
 
 static atomic64_t vmid_generation;
-- 
2.17.1