From: Oliver Upton <oliver.upton@linux.dev> mainline inclusion from mainline-v6.7-rc1 commit 9f9917bc71b08335819ea667d1e392424fb76450 category: feature bugzilla: https://gitee.com/openeuler/kernel/issues/IBN3WI CVE: NA Reference: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?i... ------------------------------------------------------------------------ Since ID_AA64DFR0_EL1 and ID_DFR0_EL1 are now writable from userspace, it is safe to bump up the default KVM sanitised debug version to v8p8. Reviewed-by: Marc Zyngier <maz@kernel.org> Link: https://lore.kernel.org/r/20231003230408.3405722-6-oliver.upton@linux.dev Signed-off-by: Oliver Upton <oliver.upton@linux.dev> --- arch/arm64/kvm/sys_regs.c | 11 +++++++---- 1 file changed, 7 insertions(+), 4 deletions(-) diff --git a/arch/arm64/kvm/sys_regs.c b/arch/arm64/kvm/sys_regs.c index 58057420132d..674295207031 100644 --- a/arch/arm64/kvm/sys_regs.c +++ b/arch/arm64/kvm/sys_regs.c @@ -1568,8 +1568,7 @@ static u64 read_sanitised_id_aa64dfr0_el1(struct kvm_vcpu *vcpu, { u64 val = read_sanitised_ftr_reg(SYS_ID_AA64DFR0_EL1); - /* Limit debug to ARMv8.0 */ - val = ID_REG_LIMIT_FIELD_ENUM(val, ID_AA64DFR0_EL1, DebugVer, IMP); + val = ID_REG_LIMIT_FIELD_ENUM(val, ID_AA64DFR0_EL1, DebugVer, V8P8); /* * Only initialize the PMU version if the vCPU was configured with one. @@ -1637,6 +1636,8 @@ static u64 read_sanitised_id_dfr0_el1(struct kvm_vcpu *vcpu, if (kvm_vcpu_has_pmu(vcpu)) val |= SYS_FIELD_PREP(ID_DFR0_EL1, PerfMon, perfmon); + val = ID_REG_LIMIT_FIELD_ENUM(val, ID_DFR0_EL1, CopDbg, Debugv8p8); + return val; } @@ -2191,7 +2192,8 @@ static const struct sys_reg_desc sys_reg_descs[] = { .set_user = set_id_dfr0_el1, .visibility = aa32_id_visibility, .reset = read_sanitised_id_dfr0_el1, - .val = ID_DFR0_EL1_PerfMon_MASK, }, + .val = ID_DFR0_EL1_PerfMon_MASK | + ID_DFR0_EL1_CopDbg_MASK, }, ID_HIDDEN(ID_AFR0_EL1), AA32_ID_SANITISED(ID_MMFR0_EL1), AA32_ID_SANITISED(ID_MMFR1_EL1), @@ -2242,7 +2244,8 @@ static const struct sys_reg_desc sys_reg_descs[] = { .get_user = get_id_reg, .set_user = set_id_aa64dfr0_el1, .reset = read_sanitised_id_aa64dfr0_el1, - .val = ID_AA64DFR0_EL1_PMUVer_MASK, }, + .val = ID_AA64DFR0_EL1_PMUVer_MASK | + ID_AA64DFR0_EL1_DebugVer_MASK, }, ID_SANITISED(ID_AA64DFR1_EL1), ID_UNALLOCATED(5,2), ID_UNALLOCATED(5,3), -- 2.33.0