From a7e0ac295d964086af3bf98352614f33c381213e Mon Sep 17 00:00:00 2001 From: Dave Martin Date: Tue, 19 Jan 2016 16:20:18 +0000 Subject: [PATCH] arm64: KVM: Obey RES0/1 reserved bits when setting CPTR_EL2 Some bits in CPTR are defined as RES1 in the architecture. Setting these bits to zero may unintentionally enable future architecture extensions, allowing guests to use them without supervision by the host. This would be bad: for forwards compatibility, this patch makes sure the affected bits are always written with 1, not 0. This patch only addresses CPTR_EL2. Initialisation of other system registers may still need review. Reviewed-by: Marc Zyngier Signed-off-by: Dave Martin Signed-off-by: Marc Zyngier --- arch/arm64/include/asm/kvm_arm.h | 1 + arch/arm64/kvm/hyp/switch.c | 8 ++++++-- 2 files changed, 7 insertions(+), 2 deletions(-) diff --git a/arch/arm64/include/asm/kvm_arm.h b/arch/arm64/include/asm/kvm_arm.h index 738a95f93e49..bef6e9243c63 100644 --- a/arch/arm64/include/asm/kvm_arm.h +++ b/arch/arm64/include/asm/kvm_arm.h @@ -182,6 +182,7 @@ #define CPTR_EL2_TCPAC (1 << 31) #define CPTR_EL2_TTA (1 << 20) #define CPTR_EL2_TFP (1 << CPTR_EL2_TFP_SHIFT) +#define CPTR_EL2_DEFAULT 0x000033ff /* Hyp Debug Configuration Register bits */ #define MDCR_EL2_TDRA (1 << 11) diff --git a/arch/arm64/kvm/hyp/switch.c b/arch/arm64/kvm/hyp/switch.c index ca8f5a5e2f96..f0e7bdfae134 100644 --- a/arch/arm64/kvm/hyp/switch.c +++ b/arch/arm64/kvm/hyp/switch.c @@ -36,7 +36,11 @@ static void __hyp_text __activate_traps(struct kvm_vcpu *vcpu) write_sysreg(val, hcr_el2); /* Trap on AArch32 cp15 c15 accesses (EL1 or EL0) */ write_sysreg(1 << 15, hstr_el2); - write_sysreg(CPTR_EL2_TTA | CPTR_EL2_TFP, cptr_el2); + + val = CPTR_EL2_DEFAULT; + val |= CPTR_EL2_TTA | CPTR_EL2_TFP; + write_sysreg(val, cptr_el2); + write_sysreg(vcpu->arch.mdcr_el2, mdcr_el2); } @@ -45,7 +49,7 @@ static void __hyp_text __deactivate_traps(struct kvm_vcpu *vcpu) write_sysreg(HCR_RW, hcr_el2); write_sysreg(0, hstr_el2); write_sysreg(read_sysreg(mdcr_el2) & MDCR_EL2_HPMN_MASK, mdcr_el2); - write_sysreg(0, cptr_el2); + write_sysreg(CPTR_EL2_DEFAULT, cptr_el2); } static void __hyp_text __activate_vm(struct kvm_vcpu *vcpu) -- 2.20.1