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arm64: KVM: Fix architecturally invalid reset value for FPEXC32_EL2
commitc88b093693
upstream. Due to what looks like a typo dating back to the original addition of FPEXC32_EL2 handling, KVM currently initialises this register to an architecturally invalid value. As a result, the VECITR field (RES1) in bits [10:8] is initialised with 0, and the two reserved (RES0) bits [6:5] are initialised with 1. (In the Common VFP Subarchitecture as specified by ARMv7-A, these two bits were IMP DEF. ARMv8-A removes them.) This patch changes the reset value from 0x70 to 0x700, which reflects the architectural constraints and is presumably what was originally intended. Cc: <stable@vger.kernel.org> # 4.12.x- Cc: Christoffer Dall <christoffer.dall@arm.com> Fixes:62a89c4495
("arm64: KVM: 32bit handling of coprocessor traps") Signed-off-by: Dave Martin <Dave.Martin@arm.com> Signed-off-by: Marc Zyngier <marc.zyngier@arm.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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@ -1079,7 +1079,7 @@ static const struct sys_reg_desc sys_reg_descs[] = {
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{ SYS_DESC(SYS_DACR32_EL2), NULL, reset_unknown, DACR32_EL2 },
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{ SYS_DESC(SYS_IFSR32_EL2), NULL, reset_unknown, IFSR32_EL2 },
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{ SYS_DESC(SYS_FPEXC32_EL2), NULL, reset_val, FPEXC32_EL2, 0x70 },
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{ SYS_DESC(SYS_FPEXC32_EL2), NULL, reset_val, FPEXC32_EL2, 0x700 },
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};
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static bool trap_dbgidr(struct kvm_vcpu *vcpu,
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