linux-kernel - [PATCH v2 2/2] KVM: arm64: Use kvm_write_guest

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Message-ID: <20200817110728.12196-3-zhukeqian1@huawei.com>
Date:   Mon, 17 Aug 2020 19:07:28 +0800
From:   Keqian Zhu <zhukeqian1@...wei.com>
To:     <linux-kernel@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <kvmarm@...ts.cs.columbia.edu>, <kvm@...r.kernel.org>
CC:     Marc Zyngier <maz@...nel.org>, Steven Price <steven.price@....com>,
        "Andrew Jones" <drjones@...hat.com>,
        Catalin Marinas <catalin.marinas@....com>,
        "Will Deacon" <will@...nel.org>, James Morse <james.morse@....com>,
        Suzuki K Poulose <suzuki.poulose@....com>,
        <wanghaibin.wang@...wei.com>, Keqian Zhu <zhukeqian1@...wei.com>
Subject: [PATCH v2 2/2] KVM: arm64: Use kvm_write_guest_lock when init stolen time

There is a lock version kvm_write_guest. Use it to simplify code.

Signed-off-by: Keqian Zhu <zhukeqian1@...wei.com>
Reviewed-by: Andrew Jones <drjones@...hat.com>
Reviewed-by: Steven Price <steven.price@....com>
---
 arch/arm64/kvm/pvtime.c | 6 +-----
 1 file changed, 1 insertion(+), 5 deletions(-)

diff --git a/arch/arm64/kvm/pvtime.c b/arch/arm64/kvm/pvtime.c
index f7b52ce..2b24e7f 100644
--- a/arch/arm64/kvm/pvtime.c
+++ b/arch/arm64/kvm/pvtime.c
@@ -55,7 +55,6 @@ gpa_t kvm_init_stolen_time(struct kvm_vcpu *vcpu)
 	struct pvclock_vcpu_stolen_time init_values = {};
 	struct kvm *kvm = vcpu->kvm;
 	u64 base = vcpu->arch.steal.base;
-	int idx;
 
 	if (base == GPA_INVALID)
 		return base;
@@ -66,10 +65,7 @@ gpa_t kvm_init_stolen_time(struct kvm_vcpu *vcpu)
 	 */
 	vcpu->arch.steal.steal = 0;
 	vcpu->arch.steal.last_steal = current->sched_info.run_delay;
-
-	idx = srcu_read_lock(&kvm->srcu);
-	kvm_write_guest(kvm, base, &init_values, sizeof(init_values));
-	srcu_read_unlock(&kvm->srcu, idx);
+	kvm_write_guest_lock(kvm, base, &init_values, sizeof(init_values));
 
 	return base;
 }
-- 
1.8.3.1