linux-kernel - [PATCH v3 19/24] arm64/kvm: Make use of the system wide safe values

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Date:	Tue, 13 Oct 2015 18:22:27 +0100
From:	"Suzuki K. Poulose" <suzuki.poulose@....com>
To:	linux-arm-kernel@...ts.infradead.org
Cc:	catalin.marinas@....com, will.deacon@....com, mark.rutland@....com,
	dave.martin@....com, Vladimir.Murzin@....com,
	steve.capper@...aro.org, linux-kernel@...r.kernel.org,
	ard.biesheuvel@...aro.org, james.morse@....com,
	marc.zyngier@....com, christoffer.dall@...aro.org,
	andre.przywara@....com, edward.nevill@...aro.org, aph@...hat.com,
	ryan.arnold@...aro.org,
	"Suzuki K. Poulose" <suzuki.poulose@....com>,
	kvmarm@...ts.cs.columbia.edu
Subject: [PATCH v3 19/24] arm64/kvm: Make use of the system wide safe values

Use the system wide safe value from the new API for safer
decisions

Cc: Marc Zyngier <marc.zyngier@....com>
Cc: Christoffer Dall <christoffer.dall@...aro.org>
Cc: kvmarm@...ts.cs.columbia.edu
Signed-off-by: Suzuki K. Poulose <suzuki.poulose@....com>
Acked-by: Christoffer Dall <christoffer.dall@...aro.org>
---
 arch/arm64/kvm/reset.c    |    2 +-
 arch/arm64/kvm/sys_regs.c |   12 ++++++------
 2 files changed, 7 insertions(+), 7 deletions(-)

diff --git a/arch/arm64/kvm/reset.c b/arch/arm64/kvm/reset.c
index 91cf535..f34745c 100644
--- a/arch/arm64/kvm/reset.c
+++ b/arch/arm64/kvm/reset.c
@@ -53,7 +53,7 @@ static bool cpu_has_32bit_el1(void)
 {
 	u64 pfr0;
 
-	pfr0 = read_cpuid(ID_AA64PFR0_EL1);
+	pfr0 = read_system_reg(SYS_ID_AA64PFR0_EL1);
 	return !!(pfr0 & 0x20);
 }
 
diff --git a/arch/arm64/kvm/sys_regs.c b/arch/arm64/kvm/sys_regs.c
index d03d3af..87a64e8 100644
--- a/arch/arm64/kvm/sys_regs.c
+++ b/arch/arm64/kvm/sys_regs.c
@@ -693,13 +693,13 @@ static bool trap_dbgidr(struct kvm_vcpu *vcpu,
 	if (p->is_write) {
 		return ignore_write(vcpu, p);
 	} else {
-		u64 dfr = read_cpuid(ID_AA64DFR0_EL1);
-		u64 pfr = read_cpuid(ID_AA64PFR0_EL1);
-		u32 el3 = !!((pfr >> 12) & 0xf);
+		u64 dfr = read_system_reg(SYS_ID_AA64DFR0_EL1);
+		u64 pfr = read_system_reg(SYS_ID_AA64PFR0_EL1);
+		u32 el3 = !!cpuid_feature_extract_field(pfr, ID_AA64PFR0_EL3_SHIFT);
 
-		*vcpu_reg(vcpu, p->Rt) = ((((dfr >> 20) & 0xf) << 28) |
-					  (((dfr >> 12) & 0xf) << 24) |
-					  (((dfr >> 28) & 0xf) << 20) |
+		*vcpu_reg(vcpu, p->Rt) = ((((dfr >> ID_AA64DFR0_WRPS_SHIFT) & 0xf) << 28) |
+					  (((dfr >> ID_AA64DFR0_BRPS_SHIFT) & 0xf) << 24) |
+					  (((dfr >> ID_AA64DFR0_CTX_CMPS_SHIFT) & 0xf) << 20) |
 					  (6 << 16) | (el3 << 14) | (el3 << 12));
 		return true;
 	}
-- 
1.7.9.5

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