From: Sebastian Ott <sebott@redhat.com> mainline inclusion from mainline-v6.15-rc1 commit b4043e7cb78b96dae07c62d3ac527f84010828cd category: feature bugzilla: https://gitee.com/openeuler/kernel/issues/IBN3WI Reference: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?i... ---------------------------------------------------------------------- Get ready to allow changes to the implementation ID registers by tracking the VM-wide values. Signed-off-by: Sebastian Ott <sebott@redhat.com> Link: https://lore.kernel.org/r/20250225005401.679536-3-oliver.upton@linux.dev Signed-off-by: Oliver Upton <oliver.upton@linux.dev> --- arch/arm64/include/asm/kvm_host.h | 9 +++++++ arch/arm64/kvm/sys_regs.c | 43 ++++++++++++++++--------------- 2 files changed, 31 insertions(+), 21 deletions(-) diff --git a/arch/arm64/include/asm/kvm_host.h b/arch/arm64/include/asm/kvm_host.h index 5cff08193a2d..ef02e1a7533d 100644 --- a/arch/arm64/include/asm/kvm_host.h +++ b/arch/arm64/include/asm/kvm_host.h @@ -319,6 +319,9 @@ struct kvm_arch { /* PMCR_EL0.N value for the guest */ KABI_EXTEND(u8 pmcr_n) KABI_EXTEND(u64 ctr_el0) + u64 midr_el1; + u64 revidr_el1; + u64 aidr_el1; }; struct kvm_vcpu_fault_info { @@ -1335,6 +1338,12 @@ static inline u64 *__vm_id_reg(struct kvm_arch *ka, u32 reg) return &ka->id_regs[IDREG_IDX(reg)]; case SYS_CTR_EL0: return &ka->ctr_el0; + case SYS_MIDR_EL1: + return &ka->midr_el1; + case SYS_REVIDR_EL1: + return &ka->revidr_el1; + case SYS_AIDR_EL1: + return &ka->aidr_el1; default: WARN_ON_ONCE(1); return NULL; diff --git a/arch/arm64/kvm/sys_regs.c b/arch/arm64/kvm/sys_regs.c index 93bad2dace60..0aa96669ec3e 100644 --- a/arch/arm64/kvm/sys_regs.c +++ b/arch/arm64/kvm/sys_regs.c @@ -1472,15 +1472,24 @@ static bool is_feature_id_reg(u32 encoding) * Return true if the register's (Op0, Op1, CRn, CRm, Op2) is * (3, 0, 0, crm, op2), where 1<=crm<8, 0<=op2<8, which is the range of ID * registers KVM maintains on a per-VM basis. + * + * Additionally, the implementation ID registers and CTR_EL0 are handled as + * per-VM registers. */ static inline bool is_vm_ftr_id_reg(u32 id) { - if (id == SYS_CTR_EL0) + switch (id) { + case SYS_CTR_EL0: + case SYS_MIDR_EL1: + case SYS_REVIDR_EL1: + case SYS_AIDR_EL1: return true; + default: + return (sys_reg_Op0(id) == 3 && sys_reg_Op1(id) == 0 && + sys_reg_CRn(id) == 0 && sys_reg_CRm(id) >= 1 && + sys_reg_CRm(id) < 8); - return (sys_reg_Op0(id) == 3 && sys_reg_Op1(id) == 0 && - sys_reg_CRn(id) == 0 && sys_reg_CRm(id) >= 1 && - sys_reg_CRm(id) < 8); + } } static inline bool is_vcpu_ftr_id_reg(u32 id) @@ -2205,36 +2214,27 @@ static void init_imp_id_regs(void) boot_cpu_aidr_val = read_sysreg(aidr_el1); } -static int get_imp_id_reg(struct kvm_vcpu *vcpu, const struct sys_reg_desc *r, - u64 *val) +static u64 reset_imp_id_reg(struct kvm_vcpu *vcpu, const struct sys_reg_desc *r) { switch (reg_to_encoding(r)) { case SYS_MIDR_EL1: - *val = boot_cpu_midr_val; - break; + return boot_cpu_midr_val; case SYS_REVIDR_EL1: - *val = boot_cpu_revidr_val; - break; + return boot_cpu_revidr_val; case SYS_AIDR_EL1: - *val = boot_cpu_aidr_val; - break; + return boot_cpu_aidr_val; default: - WARN_ON_ONCE(1); - return -EINVAL; + KVM_BUG_ON(1, vcpu->kvm); + return 0; } - - return 0; } static int set_imp_id_reg(struct kvm_vcpu *vcpu, const struct sys_reg_desc *r, u64 val) { u64 expected; - int ret; - ret = get_imp_id_reg(vcpu, r, &expected); - if (ret) - return ret; + expected = read_id_reg(vcpu, r); return (expected == val) ? 0 : -EINVAL; } @@ -2242,8 +2242,9 @@ static int set_imp_id_reg(struct kvm_vcpu *vcpu, const struct sys_reg_desc *r, #define IMPLEMENTATION_ID(reg) { \ SYS_DESC(SYS_##reg), \ .access = access_imp_id_reg, \ - .get_user = get_imp_id_reg, \ + .get_user = get_id_reg, \ .set_user = set_imp_id_reg, \ + .reset = reset_imp_id_reg, \ } /* -- 2.33.0