A Study to Evaluate the Effect of Moderate or Severe Hepatic Impairment on the Pharmacokinetics (PK) of Inavolisib

Inclusion Criteria: All participants: * Body Mass Index 18.0 to 40.0 kilogram per meter square (kg/m\^2), inclusive, and body weight \>=45 kg. * Negative hepatitis B surface antigen (HBsAg) test * Positive hepatitis B surface antibody (HBsAb) test or negative HBsAb * Negative HIV (Human Immunodeficiency Virus) test * Females will not be pregnant or breastfeeding and must be either postmenopausal or surgically sterile * Males will agree to use contraception and will refrain from sperm donation Healthy participants (Cohort 1): * Negative hepatitis C virus (HCV) antibody test or positive HCV antibody test followed by a negative HCV RNA test * Normal hepatic function and no history of clinically significant hepatic dysfunction Participants with Hepatic Impairment (Cohorts 2 and 3): * Considered to have moderate (Child-Pugh score of 7 to 9) or severe (Child-Pugh score of 10 to 15) hepatic impairment * Chronic, stable hepatic insufficiency with features of cirrhosis * Negative hepatitis C viral load Exclusion Criteria: All participants: * History of Type 1 diabetes or Type 2 Diabetes that is insulin-dependent or requires ongoing systemic treatment with two or more agents * Significant history or clinical manifestation of any metabolic, allergic, dermatological, renal, hematological, pulmonary, cardiovascular, gastrointestinal (GI), neurological, or psychiatric disorder * Significant illness, surgery, or hospitalization within 2 weeks prior to dosing. * History of gastro-in…