[PATCH v2 21/94] KVM: arm64: nv: Trap CPACR_EL1 access in virtual EL2
From: Marc Zyngier <maz@kernel.org>
Date: 2020-02-11 18:14:47
Also in:
kvm, kvmarm
Subsystem:
arm64 port (aarch64 architecture), kernel virtual machine for arm64 (kvm/arm64), the rest · Maintainers:
Catalin Marinas, Will Deacon, Marc Zyngier, Oliver Upton, Linus Torvalds
From: Jintack Lim <redacted> For the same reason we trap virtual memory register accesses in virtual EL2, we trap CPACR_EL1 access too; We allow the virtual EL2 mode to access EL1 system register state instead of the virtual EL2 one. Signed-off-by: Jintack Lim <redacted> Signed-off-by: Marc Zyngier <maz@kernel.org> --- arch/arm64/include/asm/kvm_arm.h | 2 +- arch/arm64/kvm/hyp/switch.c | 2 ++ arch/arm64/kvm/sys_regs.c | 2 +- 3 files changed, 4 insertions(+), 2 deletions(-)
diff --git a/arch/arm64/include/asm/kvm_arm.h b/arch/arm64/include/asm/kvm_arm.h
index 084844ec0b06..a907c702de45 100644
--- a/arch/arm64/include/asm/kvm_arm.h
+++ b/arch/arm64/include/asm/kvm_arm.h@@ -266,7 +266,7 @@ #define CPTR_EL2_TFP_SHIFT 10 /* Hyp Coprocessor Trap Register */ -#define CPTR_EL2_TCPAC (1 << 31) +#define CPTR_EL2_TCPAC (1U << 31) #define CPTR_EL2_TTA (1 << 20) #define CPTR_EL2_TFP (1 << CPTR_EL2_TFP_SHIFT) #define CPTR_EL2_TZ (1 << 8)
diff --git a/arch/arm64/kvm/hyp/switch.c b/arch/arm64/kvm/hyp/switch.c
index 48e738e90966..976b9661203b 100644
--- a/arch/arm64/kvm/hyp/switch.c
+++ b/arch/arm64/kvm/hyp/switch.c@@ -105,6 +105,8 @@ static void activate_traps_vhe(struct kvm_vcpu *vcpu) val &= ~CPACR_EL1_FPEN; __activate_traps_fpsimd32(vcpu); } + if (vcpu_mode_el2(vcpu) && !vcpu_el2_e2h_is_set(vcpu)) + val |= CPTR_EL2_TCPAC; write_sysreg(val, cpacr_el1);
diff --git a/arch/arm64/kvm/sys_regs.c b/arch/arm64/kvm/sys_regs.c
index 18b14c04355a..b545156c7d79 100644
--- a/arch/arm64/kvm/sys_regs.c
+++ b/arch/arm64/kvm/sys_regs.c@@ -1795,7 +1795,7 @@ static const struct sys_reg_desc sys_reg_descs[] = { ID_UNALLOCATED(7,7), { SYS_DESC(SYS_SCTLR_EL1), access_vm_reg, reset_val, SCTLR_EL1, 0x00C50078 }, - { SYS_DESC(SYS_CPACR_EL1), NULL, reset_val, CPACR_EL1, 0 }, + { SYS_DESC(SYS_CPACR_EL1), access_rw, reset_val, CPACR_EL1, 0 }, { SYS_DESC(SYS_ZCR_EL1), NULL, reset_val, ZCR_EL1, 0, .visibility = sve_visibility }, { SYS_DESC(SYS_TTBR0_EL1), access_vm_reg, reset_unknown, TTBR0_EL1 }, { SYS_DESC(SYS_TTBR1_EL1), access_vm_reg, reset_unknown, TTBR1_EL1 },
--
2.20.1
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