From: Oliver Upton <oliver.upton@linux.dev> mainline inclusion from mainline-v6.11-rc1 commit 97ca3fcc15cc0b19ccacb56d25545f1df080fbc0 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... ------------------------------------------------------------------------ IDREG() expands to the storage of a particular ID reg, which can be useful for handling both reads and writes. However, outside of a select few situations, the ID registers should be considered read only. Replace current readers with a new macro that expands to the value of the field rather than the field itself. Reviewed-by: Sebastian Ott <sebott@redhat.com> Link: https://lore.kernel.org/r/20240619174036.483943-4-oliver.upton@linux.dev Signed-off-by: Oliver Upton <oliver.upton@linux.dev> --- arch/arm64/include/asm/kvm_host.h | 14 ++++++++++++++ arch/arm64/kvm/pmu-emul.c | 2 +- arch/arm64/kvm/sys_regs.c | 2 +- 3 files changed, 16 insertions(+), 2 deletions(-) diff --git a/arch/arm64/include/asm/kvm_host.h b/arch/arm64/include/asm/kvm_host.h index 5fb92fcb81c6..2fbf6716059f 100644 --- a/arch/arm64/include/asm/kvm_host.h +++ b/arch/arm64/include/asm/kvm_host.h @@ -1285,6 +1285,20 @@ extern unsigned int twedel; void kvm_arm_vcpu_power_off(struct kvm_vcpu *vcpu); bool kvm_arm_vcpu_stopped(struct kvm_vcpu *vcpu); +static inline u64 *__vm_id_reg(struct kvm_arch *ka, u32 reg) +{ + switch (reg) { + case sys_reg(3, 0, 0, 1, 0) ... sys_reg(3, 0, 0, 7, 7): + return &ka->id_regs[IDREG_IDX(reg)]; + default: + WARN_ON_ONCE(1); + return NULL; + } +} + +#define kvm_read_vm_id_reg(kvm, reg) \ + ({ u64 __val = *__vm_id_reg(&(kvm)->arch, reg); __val; }) + extern bool force_wfi_trap; extern bool kvm_ncsnp_support; extern bool kvm_dvmbm_support; diff --git a/arch/arm64/kvm/pmu-emul.c b/arch/arm64/kvm/pmu-emul.c index 6469a7c51df3..ea715ab0d5a6 100644 --- a/arch/arm64/kvm/pmu-emul.c +++ b/arch/arm64/kvm/pmu-emul.c @@ -55,7 +55,7 @@ static u32 __kvm_pmu_event_mask(unsigned int pmuver) static u32 kvm_pmu_event_mask(struct kvm *kvm) { - u64 dfr0 = IDREG(kvm, SYS_ID_AA64DFR0_EL1); + u64 dfr0 = kvm_read_vm_id_reg(kvm, SYS_ID_AA64DFR0_EL1); u8 pmuver = SYS_FIELD_GET(ID_AA64DFR0_EL1, PMUVer, dfr0); return __kvm_pmu_event_mask(pmuver); diff --git a/arch/arm64/kvm/sys_regs.c b/arch/arm64/kvm/sys_regs.c index d928f00fa792..95471d97ccb4 100644 --- a/arch/arm64/kvm/sys_regs.c +++ b/arch/arm64/kvm/sys_regs.c @@ -1404,7 +1404,7 @@ static u64 kvm_read_sanitised_id_reg(struct kvm_vcpu *vcpu, static u64 read_id_reg(const struct kvm_vcpu *vcpu, const struct sys_reg_desc *r) { - return IDREG(vcpu->kvm, reg_to_encoding(r)); + return kvm_read_vm_id_reg(vcpu->kvm, reg_to_encoding(r)); } /* -- 2.33.0