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From: Peng Liang <liangpeng10@huawei.com>
To: <kvmarm@lists.cs.columbia.edu>
Cc: zhang.zhanghailiang@huawei.com, kvm@vger.kernel.org,
	maz@kernel.org, will@kernel.org
Subject: [RFC v2 1/7] arm64: add a helper function to traverse arm64_ftr_regs
Date: Thu, 17 Sep 2020 20:00:55 +0800	[thread overview]
Message-ID: <20200917120101.3438389-2-liangpeng10@huawei.com> (raw)
In-Reply-To: <20200917120101.3438389-1-liangpeng10@huawei.com>

If we want to emulate ID registers, we need to initialize ID registers
firstly.  This commit is to add a helper function to traverse
arm64_ftr_regs so that we can initialize ID registers from
arm64_ftr_regs.

Signed-off-by: zhanghailiang <zhang.zhanghailiang@huawei.com>
Signed-off-by: Peng Liang <liangpeng10@huawei.com>
---
 arch/arm64/include/asm/cpufeature.h |  2 ++
 arch/arm64/kernel/cpufeature.c      | 13 +++++++++++++
 2 files changed, 15 insertions(+)

diff --git a/arch/arm64/include/asm/cpufeature.h b/arch/arm64/include/asm/cpufeature.h
index 89b4f0142c28..2ba7c4f11d8a 100644
--- a/arch/arm64/include/asm/cpufeature.h
+++ b/arch/arm64/include/asm/cpufeature.h
@@ -79,6 +79,8 @@ struct arm64_ftr_reg {
 
 extern struct arm64_ftr_reg arm64_ftr_reg_ctrel0;
 
+int arm64_cpu_ftr_regs_traverse(int (*op)(u32, u64, void *), void *argp);
+
 /*
  * CPU capabilities:
  *
diff --git a/arch/arm64/kernel/cpufeature.c b/arch/arm64/kernel/cpufeature.c
index 6424584be01e..698b32705544 100644
--- a/arch/arm64/kernel/cpufeature.c
+++ b/arch/arm64/kernel/cpufeature.c
@@ -1112,6 +1112,19 @@ u64 read_sanitised_ftr_reg(u32 id)
 	return regp->sys_val;
 }
 
+int arm64_cpu_ftr_regs_traverse(int (*op)(u32, u64, void *), void *argp)
+{
+	int i, ret;
+
+	for (i = 0; i <  ARRAY_SIZE(arm64_ftr_regs); i++) {
+		ret = (*op)(arm64_ftr_regs[i].sys_id,
+			    arm64_ftr_regs[i].reg->sys_val, argp);
+		if (ret < 0)
+			return ret;
+	}
+	return 0;
+}
+
 #define read_sysreg_case(r)	\
 	case r:		return read_sysreg_s(r)
 
-- 
2.26.2

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WARNING: multiple messages have this Message-ID (diff)
From: Peng Liang <liangpeng10@huawei.com>
To: <kvmarm@lists.cs.columbia.edu>
Cc: <kvm@vger.kernel.org>, <maz@kernel.org>, <will@kernel.org>,
	<drjones@redhat.com>, <zhang.zhanghailiang@huawei.com>,
	<xiexiangyou@huawei.com>, Peng Liang <liangpeng10@huawei.com>
Subject: [RFC v2 1/7] arm64: add a helper function to traverse arm64_ftr_regs
Date: Thu, 17 Sep 2020 20:00:55 +0800	[thread overview]
Message-ID: <20200917120101.3438389-2-liangpeng10@huawei.com> (raw)
In-Reply-To: <20200917120101.3438389-1-liangpeng10@huawei.com>

If we want to emulate ID registers, we need to initialize ID registers
firstly.  This commit is to add a helper function to traverse
arm64_ftr_regs so that we can initialize ID registers from
arm64_ftr_regs.

Signed-off-by: zhanghailiang <zhang.zhanghailiang@huawei.com>
Signed-off-by: Peng Liang <liangpeng10@huawei.com>
---
 arch/arm64/include/asm/cpufeature.h |  2 ++
 arch/arm64/kernel/cpufeature.c      | 13 +++++++++++++
 2 files changed, 15 insertions(+)

diff --git a/arch/arm64/include/asm/cpufeature.h b/arch/arm64/include/asm/cpufeature.h
index 89b4f0142c28..2ba7c4f11d8a 100644
--- a/arch/arm64/include/asm/cpufeature.h
+++ b/arch/arm64/include/asm/cpufeature.h
@@ -79,6 +79,8 @@ struct arm64_ftr_reg {
 
 extern struct arm64_ftr_reg arm64_ftr_reg_ctrel0;
 
+int arm64_cpu_ftr_regs_traverse(int (*op)(u32, u64, void *), void *argp);
+
 /*
  * CPU capabilities:
  *
diff --git a/arch/arm64/kernel/cpufeature.c b/arch/arm64/kernel/cpufeature.c
index 6424584be01e..698b32705544 100644
--- a/arch/arm64/kernel/cpufeature.c
+++ b/arch/arm64/kernel/cpufeature.c
@@ -1112,6 +1112,19 @@ u64 read_sanitised_ftr_reg(u32 id)
 	return regp->sys_val;
 }
 
+int arm64_cpu_ftr_regs_traverse(int (*op)(u32, u64, void *), void *argp)
+{
+	int i, ret;
+
+	for (i = 0; i <  ARRAY_SIZE(arm64_ftr_regs); i++) {
+		ret = (*op)(arm64_ftr_regs[i].sys_id,
+			    arm64_ftr_regs[i].reg->sys_val, argp);
+		if (ret < 0)
+			return ret;
+	}
+	return 0;
+}
+
 #define read_sysreg_case(r)	\
 	case r:		return read_sysreg_s(r)
 
-- 
2.26.2


  reply	other threads:[~2020-09-17 12:09 UTC|newest]

Thread overview: 52+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-09-17 12:00 [RFC v2 0/7] kvm: arm64: emulate ID registers Peng Liang
2020-09-17 12:00 ` Peng Liang
2020-09-17 12:00 ` Peng Liang [this message]
2020-09-17 12:00   ` [RFC v2 1/7] arm64: add a helper function to traverse arm64_ftr_regs Peng Liang
2020-09-18  7:18   ` Andrew Jones
2020-09-18  7:18     ` Andrew Jones
2020-09-18  9:24     ` Peng Liang
2020-09-18  9:24       ` Peng Liang
2020-09-18 10:28       ` Andrew Jones
2020-09-18 10:28         ` Andrew Jones
2020-09-18 11:58         ` Peng Liang
2020-09-18 11:58           ` Peng Liang
2020-09-17 12:00 ` [RFC v2 2/7] arm64: introduce check_features Peng Liang
2020-09-17 12:00   ` Peng Liang
2020-09-18  7:30   ` Andrew Jones
2020-09-18  7:30     ` Andrew Jones
2020-09-18  9:25     ` Peng Liang
2020-09-18  9:25       ` Peng Liang
2020-09-17 12:00 ` [RFC v2 3/7] kvm: arm64: save ID registers to sys_regs file Peng Liang
2020-09-17 12:00   ` Peng Liang
2020-09-18  7:34   ` Andrew Jones
2020-09-18  7:34     ` Andrew Jones
2020-09-17 12:00 ` [RFC v2 4/7] kvm: arm64: introduce check_user Peng Liang
2020-09-17 12:00   ` Peng Liang
2020-09-18  7:41   ` Andrew Jones
2020-09-18  7:41     ` Andrew Jones
2020-09-18  9:25     ` Peng Liang
2020-09-18  9:25       ` Peng Liang
2020-09-17 12:00 ` [RFC v2 5/7] kvm: arm64: implement check_user for ID registers Peng Liang
2020-09-17 12:00   ` Peng Liang
2020-09-18  7:46   ` Andrew Jones
2020-09-18  7:46     ` Andrew Jones
2020-09-18  9:26     ` Peng Liang
2020-09-18  9:26       ` Peng Liang
2020-09-17 12:01 ` [RFC v2 6/7] kvm: arm64: make ID registers configurable Peng Liang
2020-09-17 12:01   ` Peng Liang
2020-09-18  7:50   ` Andrew Jones
2020-09-18  7:50     ` Andrew Jones
2020-09-18  9:26     ` Peng Liang
2020-09-18  9:26       ` Peng Liang
2020-09-17 12:01 ` [RFC v2 7/7] kvm: arm64: add KVM_CAP_ARM_CPU_FEATURE extension Peng Liang
2020-09-17 12:01   ` Peng Liang
2020-09-18  7:55   ` Andrew Jones
2020-09-18  7:55     ` Andrew Jones
2020-09-18  9:26     ` Peng Liang
2020-09-18  9:26       ` Peng Liang
2020-09-18  8:01 ` [RFC v2 0/7] kvm: arm64: emulate ID registers Andrew Jones
2020-09-18  8:01   ` Andrew Jones
2020-09-18  9:51   ` Peng Liang
2020-09-18  9:51     ` Peng Liang
2020-09-18 10:20     ` Andrew Jones
2020-09-18 10:20       ` Andrew Jones

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