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| author | Dave Martin <Dave.Martin@arm.com> | 2019-02-21 11:42:32 +0000 |
|---|---|---|
| committer | Marc Zyngier <marc.zyngier@arm.com> | 2019-02-22 09:59:20 +0000 |
| commit | c88b093693ccbe41991ef2e9b1d251945e6e54ed (patch) | |
| tree | eb4b90f240d0961435e52bd5ea287f2d08f86661 /arch | |
| parent | 7f5d9c1bc0e6c13ba01546e9c6fda083764a4e9c (diff) | |
| download | linux-0-day-c88b093693ccbe41991ef2e9b1d251945e6e54ed.tar.gz linux-0-day-c88b093693ccbe41991ef2e9b1d251945e6e54ed.tar.xz | |
arm64: KVM: Fix architecturally invalid reset value for FPEXC32_EL2
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: 62a89c44954f ("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>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/arm64/kvm/sys_regs.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/arch/arm64/kvm/sys_regs.c b/arch/arm64/kvm/sys_regs.c index 81a342679e60f..a398d04274b75 100644 --- a/arch/arm64/kvm/sys_regs.c +++ b/arch/arm64/kvm/sys_regs.c @@ -1523,7 +1523,7 @@ static const struct sys_reg_desc sys_reg_descs[] = { { SYS_DESC(SYS_DACR32_EL2), NULL, reset_unknown, DACR32_EL2 }, { SYS_DESC(SYS_IFSR32_EL2), NULL, reset_unknown, IFSR32_EL2 }, - { SYS_DESC(SYS_FPEXC32_EL2), NULL, reset_val, FPEXC32_EL2, 0x70 }, + { SYS_DESC(SYS_FPEXC32_EL2), NULL, reset_val, FPEXC32_EL2, 0x700 }, }; static bool trap_dbgidr(struct kvm_vcpu *vcpu, |